EP0146236A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
High speed solid state multiplexer
Assignee: Honeywell Inc
•
Filing: 1984-10-22
•
Granted: —
•
Expires: 2004-10-22
Abstract
Abstract @ Multiplexing apparatus for outputing selected input signals utilises input transistors (20-37) coupled between input sources (11-19) and diodes (100-117). A first set of switching transistors (40-57) coupled to the input transistors and the diodes, blocks the outputing of non-selected input signals by applying a predetermined voltage to the anodes of corresponding diodes. A second set of switching transistors (70-87), coupled to the input transistors and the diodes, permits the outputing of selected input signals on the emitters of output transistors (120,121) coupled to the diodes, by applying current to the emitters of corresponding input transistors, and the anodes of corresponding diodes.
Inventors
- 👤 David Richard Crocker
- 👤 Francis Willard Larson
- 👤 Desi Duran Stelling
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 14:27
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/62; H03K17/6257; H03K17/6264; H04; H04J; H04J3/00; H04J3/02; H04J3/04; H04J3/047
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
618 words
Multiplexing apparatus for receiving a plurality of pairs of input signals, having voltages in a predetermined range, from a plurality of input sources each comprising high and low voltage input sources, and for outputing at least one pair of input signals selected from the plurality of pairs of input signals, characterised in that it comprises a unit including a first plurality of pairs of transistors (20-37), the bases of each pair of transistors in the first plurality of pairs of transistors being adapted for coupling, respectively, to high and low voltage input sources (lla-16a; llb-16b) of one of the input sources (11-16); means (91) for applying a predetermined voltage to the collector of each transistor in the first plurality of pairs of transistors; a plurality of pairs of diodes (100-117) coupled, respectively, to the first plurality of pairs of transistors such that the anodes of each pair of diodes are coupled, respectively, to the emitters of a corresponding pair of transistors in the first plurality of pairs of transistors; a second plurality of pairs of transistors (40-57) coupled, respectively, to the first plurality of pairs of transistors such that the collectors of each pair of transistors in the second plurality of pairs of transistors are coupled respectively, to the emitters of a corresponding pair of transistors in the first plurality of pairs of transistors, the collector of each transistor in the second plurality of pairs of transistors being coupled to the anode of the same diode in the plurality of pairs of diodes to which a corresponding transistor in the first plurality of pairs of transistors is coupled; means (60,62) for applying a predetermined voltage to the bases of a selected pair of transistors in the second plurality of pairs of transistors; means (60,61) for applying a predetermined current to the emitters of the selected pair of transistors in the second plurality of pairs of transistors; a third plurality of pairs of transistors (70-87) coupled, respectively, to the first plurality of pairs of transistors such that the emitters of each pair of transistors in the third plurality of pairs of transistors are coupled, respectively, to the emitters of a corresponding pair of transistors in the first plurality of pairs of transistors, the emitter of each transistor in the third plurality of pairs of transistors being coupled to the anode of the same diode, in the plurality of pairs of diodes, to which a corresponding transistor in the first plurality of pairs of transistors is coupled; means (91) for applying a predetermined voltage to the collector of each transistor in the third plurality of pairs of transistors; means (90, 92) for applying a predetermined voltage to the bases of a selected pair of transistors in the third plurality of pairs of transistors; a first output transistor (120), the base of which is coupled to the cathode of a first diode in each pair of the plurality of pairs of diodes; means (150) for applying a predetermined voltage to the collector of the first output transistor; a second output transistor (121), the base of which is coupled to the cathode of a second diode in each pair of the plurality of pairs of diodes; means (151) for applying a predetermined voltage to the collector of the second output transistor; and means (152), coupled to the cathode of each diode in the plurality of pairs of diodes, for sinking a predetermined portion of the predetermined current applied to the emitters of the selected pair of transistors in the second plurality of pairs of transistors through a pair of diodes, in the plurality of pairs of diodes, coupled to the selected pair of transistors in the second plurality of pairs of transistors.
Claim 2
Dependent Claim
618 words
Multiplexing apparatus for receiving a plurality of pairs of input signals, having voltages in a predetermined range, from a plurality of input sources each comprising high and low voltage input sources, and for outputing at least one pair of input signals selected from the plurality of pairs of input signals, characterised in that it comprises a unit including a first plurality of pairs of transistors (20-37), the bases of each pair of transistors in the first plurality of pairs of transistors being adapted for coupling, respectively, to high and low voltage input sources (lla-16a; llb-16b) of one of the input sources (11-16); means (91) for applying a predetermined voltage to the collector of each transistor in the first plurality of pairs of transistors; a plurality of pairs of diodes (100-117) coupled, respectively, to the first plurality of pairs of transistors such that the anodes of each pair of diodes are coupled, respectively, to the emitters of a corresponding pair of transistors in the first plurality of pairs of transistors; a second plurality of pairs of transistors (40-57) coupled, respectively, to the first plurality of pairs of transistors such that the collectors of each pair of transistors in the second plurality of pairs of transistors are coupled respectively, to the emitters of a corresponding pair of transistors in the first plurality of pairs of transistors, the collector of each transistor in the second plurality of pairs of transistors being coupled to the anode of the same diode in the plurality of pairs of diodes to which a corresponding transistor in the first plurality of pairs of transistors is coupled; means (60,62) for applying a predetermined voltage to the bases of a selected pair of transistors in the second plurality of pairs of transistors; means (60,61) for applying a predetermined current to the emitters of the selected pair of transistors in the second plurality of pairs of transistors; a third plurality of pairs of transistors (70-87) coupled, respectively, to the first plurality of pairs of transistors such that the emitters of each pair of transistors in the third plurality of pairs of transistors are coupled, respectively, to the emitters of a corresponding pair of transistors in the first plurality of pairs of transistors, the emitter of each transistor in the third plurality of pairs of transistors being coupled to the anode of the same diode, in the plurality of pairs of diodes, to which a corresponding transistor in the first plurality of pairs of transistors is coupled; means (91) for applying a predetermined voltage to the collector of each transistor in the third plurality of pairs of transistors; means (90, 92) for applying a predetermined voltage to the bases of a selected pair of transistors in the third plurality of pairs of transistors; a first output transistor (120), the base of which is coupled to the cathode of a first diode in each pair of the plurality of pairs of diodes; means (150) for applying a predetermined voltage to the collector of the first output transistor; a second output transistor (121), the base of which is coupled to the cathode of a second diode in each pair of the plurality of pairs of diodes; means (151) for applying a predetermined voltage to the collector of the second output transistor; and means (152), coupled to the cathode of each diode in the plurality of pairs of diodes, for sinking a predetermined portion of the predetermined current applied to the emitters of the selected pair of transistors in the second plurality of pairs of transistors through a pair of diodes, in the plurality of pairs of diodes, coupled to the selected pair of transistors in the second plurality of pairs of transistors.
Claim 3
Dependent Claim
76 words
Apparatus according to claim 1, characterised in that the means for applying a predetermined voltage to the collector of each transistor of the first plurality of pairs of transistors (20-37), and the means for applying a predetermined voltage to the collector of each transistor of the third plurality of pairs of transistors (70-87) comprise a first voltage source (91) coupled to the collector of each transistor of the first and third plurality of pairs of transistors.
Claim 4
Dependent Claim
187 words
Apparatus according to claim 1 or 2, characterised in that the means for applying a predetermined voltage to the bases of a selected pair of transistors of the second plurality of pairs of transistors (40-57) comprises a second voltage source (62) and switching means (60) for coupling the second voltage source to the bases of the selected pair of transistors of the second plurality of pairs of transistors, in that the means for applying a predetermined current to the emitters of the selected pair of transistors of the second plurality of pairs of transistors comprises a current source (61) and the switching means (60), additionally for coupling the current source to the emitters of the selected pair of transistors of the second plurality of pairs of transistors, and in that the means for applying a predetermined voltage to the bases of a selected pair of transistors of the third plurality of pairs of transistors comprises a third voltage source (92) and switching means (90) for coupling the third voltage source to the bases of the selected pair of transistors of the third plurality of pairs of transistors.
Claim 5
Dependent Claim
74 words
Apparatus according to any of the preceding claims, characterised in that the means for applying a predetermined voltage to the collector of the first output transistor (120) comprises a voltage source (150) coupled to the collector of the first output transistor, and in that the means for applying a predetermined voltage to the collector of the second output transistor (121) comprises a voltage source (151) coupled to the collector of the second output transistor.
Claim 6
Dependent Claim
35 words
Apparatus according to any of the preceding claims, characterised in that the current sinking means comprises a current sink (152) coupled to the cathode of each diode in the plurality of pairs of diodes (100-117).
Claim 7
Dependent Claim
21 words
Apparatus according to any of the preceding claims, characterised in that the predetermined portion of the predetermined current is substantially one-half.
Claim 8
Dependent Claim
37 words
Apparatus according to any of the preceding claims, characterised in that it further comprises means (155) coupled to the emitters of the first and second output transistors (120,121) for sinking current to drive a preselected load (154).
Claim 9
Dependent Claim
60 words
Apparatus according to any of the preceding claims, characterised in that it further comprises at least one replica (164) of the unit (160), the bases of each pair of transistors in the first plurality of pairs of transistors of the replica being adapted for coupling, respectively, to high and low voltage input sources (170-178) of one of the input sources.
Claim 10
Dependent Claim
446 words
Multiplexing apparatus for receiving a plurality of input signals, having voltages in a predetermined range, from a plurality of input sources, and for outputing at least one input signal selected from said plurality of input signals, characterised in that it comprises a unit including a first plurality of transistors, the base of each transistor in said first plurality of transistors being adapted for coupling to one of the input sources; means for applying a predetermined voltage to the collector of each transistor in the first plurality of transistors; a plurality of diodes coupled, respectively, to the first plurality of transistors such that the anode of each diode is coupled to the emitter of a corresponding transistor in the first plurality of transistors; a second plurality of transistors coupled, respectively, to the first plurality of transistors such that the collector of each transistor in the second plurality of transistors is coupled to the emitter of a corresponding transistor in the first plurality of transistors, the collector of each transistor in the second plurality of transistors being coupled to the anode of the same diode, in the plurality of diodes, to which a corresponding transistor in the first plurality of transistors is coupled; means for applying a predetermined voltage to the base of a selected transistor in the second plurality of transistors; means for applying a predetermined current to the emitter of the selected transistor in the second plurality of transistors; a third plurality of transistors coupled, respectively, to the first plurality of transistors such that the emitter of each transistor in the third plurality of transistors is coupled to the emitter of a corresponding transistor in the first plurality of transistors, the emitter of each transistor in the third plurality of transistors being coupled to the anode of the same diode, in the plurality of diodes, to which a corresponding transistor in the first plurality of transistors is coupled; means for applying a predetermined voltage to the collector of each transistor in the third plurality of transistors; means for applying a predetermined voltage to the base of a selected transistor in the third plurality of transistors; an output transistor, the base of the output transistor being coupled to the cathode of each diode in the plurality of diodes; means for applying a predetermined voltage to the collector of the output transistor; and means, coupled to the cathode of each diode in the plurality of diodes, for sinking a predetermined portion of the predetermined current applied to the emitter of the selected transistor in the second plurality of transistors through a diode, in the plurality of diodes, coupled to the selected transistor in the second plurality of transistors.
Claim 11
Dependent Claim
446 words
Multiplexing apparatus for receiving a plurality of input signals, having voltages in a predetermined range, from a plurality of input sources, and for outputing at least one input signal selected from said plurality of input signals, characterised in that it comprises a unit including a first plurality of transistors, the base of each transistor in said first plurality of transistors being adapted for coupling to one of the input sources; means for applying a predetermined voltage to the collector of each transistor in the first plurality of transistors; a plurality of diodes coupled, respectively, to the first plurality of transistors such that the anode of each diode is coupled to the emitter of a corresponding transistor in the first plurality of transistors; a second plurality of transistors coupled, respectively, to the first plurality of transistors such that the collector of each transistor in the second plurality of transistors is coupled to the emitter of a corresponding transistor in the first plurality of transistors, the collector of each transistor in the second plurality of transistors being coupled to the anode of the same diode, in the plurality of diodes, to which a corresponding transistor in the first plurality of transistors is coupled; means for applying a predetermined voltage to the base of a selected transistor in the second plurality of transistors; means for applying a predetermined current to the emitter of the selected transistor in the second plurality of transistors; a third plurality of transistors coupled, respectively, to the first plurality of transistors such that the emitter of each transistor in the third plurality of transistors is coupled to the emitter of a corresponding transistor in the first plurality of transistors, the emitter of each transistor in the third plurality of transistors being coupled to the anode of the same diode, in the plurality of diodes, to which a corresponding transistor in the first plurality of transistors is coupled; means for applying a predetermined voltage to the collector of each transistor in the third plurality of transistors; means for applying a predetermined voltage to the base of a selected transistor in the third plurality of transistors; an output transistor, the base of the output transistor being coupled to the cathode of each diode in the plurality of diodes; means for applying a predetermined voltage to the collector of the output transistor; and means, coupled to the cathode of each diode in the plurality of diodes, for sinking a predetermined portion of the predetermined current applied to the emitter of the selected transistor in the second plurality of transistors through a diode, in the plurality of diodes, coupled to the selected transistor in the second plurality of transistors.
Claim 12
Dependent Claim
67 words
Apparatus according to claim 9, characterised in that the means for applying a predetermined voltage to the collector of each transistor in the first plurality of transistors, and the means for applying a predetermined voltage to the collector of each transistor in the third plurality of transistors comprise a first voltage source coupled to the collector of each transistor in the first and third plurality of transistors.
Claim 13
Dependent Claim
156 words
Apparatus according to claim 9 or 10, characterised in that the means for applying a predetermined voltage to the base of a selected transistor in the second plurality of transistors comprises a second voltage source and switching means for coupling the second voltage source to the base of the selected transistor in the second plurality of transistors, in that the means for applying a predeterminedd current to the emitter of the selected transistor in the second plurality of transistors comprises a current source and the switching means, additionally for coupling the current source to the emitter of the selected transistor in the second plurality of transistors, and in that the means for applying a predetermined voltage to the base of a selected transistor in the third plurality of transistors comprises a third voltage source, and switching means for coupling the third voltage source to the base of the selected transistor in the third plurality of transistors.
Claim 14
Dependent Claim
38 words
Apparatus according to any of claims 9 to 11, characterised in that the means for applying a predetermined voltage to the collector of the output transistor comprises a voltage source coupled to the collector of the output transistor.
Claim 15
Dependent Claim
32 words
Apparatus according to any of claims 9 to 12, characterised in that the current sinking means comprises a current sink coupled to the cathode of each diode in the plurality of diodes.
Claim 16
Dependent Claim
22 words
Apparatus according to any of claims 9 to 13, characterised in that the predetermined portion of the predetermined current is substantially one-half.
Claim 17
Dependent Claim
32 words
Apparatus according to any of claims 9 to 14, characterised in that it further comprises means, coupled to the emitter of the output transistor, for sinking current to drive a preselected load.
Claim 18
Dependent Claim
46 words
Apparatus according to any of claims 9 to 15, characterised in that it further comprises at least one replica of the unit, the base of each transistor in the first plurality of transistors of the replica being adapted for coupling to one of the input sources.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.