Patent US3727072A successfully refreshed from Google Patents.
US3727072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input circuit for multiple emitter transistor
Assignee: RCA Corp
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Filing: 1971-11-09
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Granted: 1973-04-10
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Expires: 1991-11-09
Abstract
Abstract The emitter electrodes of a multiple emitter transistor are coupled to ground by one set of diodes and to the supply voltage terminal through resistors and another set of diodes. The emitter electrodes serve as input terminals to a circuit such as a transistor-transistor logic (T2L) circuit. In the absence of input signals, the resistors and the second set of diodes maintain these input terminals at a fixed voltage level providing high speed, and high noise immunity performance. The second set of diodes insures that undesired currents do not flow through the resistors.
Inventors
- 👤 C Madrazo
- 👤 R Saenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:55
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/01; H03K19/013; H03K19/003; H03K19/00346; H03K19/00353; H03K19/02; H03K19/08; H03K19/082; H03K19/088; H10; H10D; H10D1/00; H10D1/40; H10D1/43
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
131 words
An input circuit to a multiple-emitter transistor circuit of the type receiving input signals at said emitters and in which the base is connected to a voltage supply terminal for an operating voltage VCC comprising, in combination: a plurality of first diodes, each connected to a different emitter, each poled in the reverse direction relative to the emitter-to-base diode to which it is connected, and each coupled between an emitter and a point of reference potential; a like plurality of second diodes, each second diode connected like-electrode-to-like-electrode to a different one of the first diodes; and a plurality of direct current impedances, all connected at one terminal to a voltage supply terminal and each connected at its other terminal to the other electrode of a different one of said second diodes.
Claim 2
Dependent Claim
131 words
An input circuit to a multiple-emitter transistor circuit of the type receiving input signals at said emitters and in which the base is connected to a voltage supply terminal for an operating voltage VCC comprising, in combination: a plurality of first diodes, each connected to a different emitter, each poled in the reverse direction relative to the emitter-to-base diode to which it is connected, and each coupled between an emitter and a point of reference potential; a like plurality of second diodes, each second diode connected like-electrode-to-like-electrode to a different one of the first diodes; and a plurality of direct current impedances, all connected at one terminal to a voltage supply terminal and each connected at its other terminal to the other electrode of a different one of said second diodes.
Claim 3
Dependent Claim
97 words
In combination with a multiple emitter transistor which is connected at its base to a supply voltage terminal and which is adapted to receive input signals at its emitters: a number of first diodes equal to the number of emitters, respectively coupled between said emitters and ground, each diode poled in the reverse direction relative to the emitter-to-base diodes of said transistor; the same number of second diodes respectively connected to said first diodes, like electrode-to-like-electrode; and the same number of resistors connected from said supply voltage terminal to the respective other electrodes of said second diodes.
Claim 4
Dependent Claim
97 words
In combination with a multiple emitter transistor which is connected at its base to a supply voltage terminal and which is adapted to receive input signals at its emitters: a number of first diodes equal to the number of emitters, respectively coupled between said emitters and ground, each diode poled in the reverse direction relative to the emitter-to-base diodes of said transistor; the same number of second diodes respectively connected to said first diodes, like electrode-to-like-electrode; and the same number of resistors connected from said supply voltage terminal to the respective other electrodes of said second diodes.
Claim 5
Dependent Claim
27 words
In the combination as set forth in claim 2, all of the elements set forth being integrated onto common substrate, said common substrate being connected to ground.
Claim 6
Dependent Claim
127 words
In combination: driver circuits operated from one power supply; and a receiver circuit operated from a second power supply and connected to said driver circuits, said receiver circuit comprising: a multiple emitter transistor connected at its base to said second power supply and at its emitters to said driver circuits; and a plurality of series circuits, each comprising a non-linear resistance means in series with a diode, each series circuit connected between said second power supply and a different emitter, respectively, the diode of a series circuit poled to conduct the second power supply current in the forward direction and said non-linear resistance means exhibiting a relatively high impedance for this direction of current flow and a relatively low impedance for the opposite direction of current flow.
Claim 7
Dependent Claim
127 words
In combination: driver circuits operated from one power supply; and a receiver circuit operated from a second power supply and connected to said driver circuits, said receiver circuit comprising: a multiple emitter transistor connected at its base to said second power supply and at its emitters to said driver circuits; and a plurality of series circuits, each comprising a non-linear resistance means in series with a diode, each series circuit connected between said second power supply and a different emitter, respectively, the diode of a series circuit poled to conduct the second power supply current in the forward direction and said non-linear resistance means exhibiting a relatively high impedance for this direction of current flow and a relatively low impedance for the opposite direction of current flow.
Claim 8
Dependent Claim
132 words
An integrated circuit comprising, in combination: a multiple emitter transistor, having also a base; a power supply terminal; a resistor connected between said terminal and said base; and a plurality of circuits each connected between a different emitter and said power supply terminal, each circuit comprising a non-linear resistance in series with an asymmetrically conducting element, said non-linear resistance comprising a first diffusion of one conductivity type serving as a resistor and a second diffusion of different conductivity type forming a junction with said first diffusion and operating as a diode in shunt with said resistor poled to conduct the power supply current in the reverse direction and said asymmetrically conducting element comprising a diode serving as an isolating device and poled to conduct the power supply current in the forward direction.
Claim 9
Dependent Claim
132 words
An integrated circuit comprising, in combination: a multiple emitter transistor, having also a base; a power supply terminal; a resistor connected between said terminal and said base; and a plurality of circuits each connected between a different emitter and said power supply terminal, each circuit comprising a non-linear resistance in series with an asymmetrically conducting element, said non-linear resistance comprising a first diffusion of one conductivity type serving as a resistor and a second diffusion of different conductivity type forming a junction with said first diffusion and operating as a diode in shunt with said resistor poled to conduct the power supply current in the reverse direction and said asymmetrically conducting element comprising a diode serving as an isolating device and poled to conduct the power supply current in the forward direction.
Claim 10
Dependent Claim
76 words
In the combination set forth in claim 4, said non-linear resistance means comprising a first diffusion of one conductivity type serving as a resistor and a second diffusion of different conductivity type forming a junction with said first diffusion and operating as a diode in shunt with said resistor poled to conduct current in said opposite direction of current flow, that is, in a direction from the emitter of said transistor to said second power supply.
Claim 11
Dependent Claim
43 words
In the combination as set forth in claim 4, further including a plurality of second diodes, each second diode connected between an emitter and a point of reference potential, each second diode connected in the reverse direction relative to said second power supply.
References Cited (Backward Citations)
US3138721A
Cited
US3641362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |