US3628053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logic switch with variable threshold circuit
Assignee: International Business Machines Corp
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Filing: 1969-12-22
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Granted: 1971-12-14
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Expires: 1989-12-22
Abstract
Abstract Disclosed is an improved logic switching circuit in the class of switching circuits in which the output signal changes in response to an input signal traversing a reference potential. Disclosed also is an improved means for varying the reference potential resulting in an overall increase in speed and increased immunity to noise in the transient state. The means for varying the reference potential in its essence includes two transistors in a common emitter-type configuration in which a resistive imbalance is placed in the respective emitter current paths, thereby providing an inverted output from a common emitter-type configuration, and having an AC response which differs from the DC response.
Inventors
- 👤 Leonard Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:38
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/023; H03K3/0233; H03K3/02337; H03K19/00; H03K19/01; H03K19/013; H03K19/0175; H03K19/018; H03K19/01806; H03K19/02; H03K19/08; H03K19/0813; H03K19/082; H03K19/086
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
108 words
A switching circuit with an active binary element having a reference node and an input node and switchable from one state to another in response to the potential of the input node traversing the potential of the reference node, and an output network for connecting said binary element to a load, the improvement comprising: means having an output connected to said reference node to vary the potential of the latter in time-delayed phase with any variation of the potential of the input node; said means including at least two transistors, the output of said means being taken from a common point in the emitter circuit of said transistors.
Claim 2
Dependent Claim
108 words
A switching circuit with an active binary element having a reference node and an input node and switchable from one state to another in response to the potential of the input node traversing the potential of the reference node, and an output network for connecting said binary element to a load, the improvement comprising: means having an output connected to said reference node to vary the potential of the latter in time-delayed phase with any variation of the potential of the input node; said means including at least two transistors, the output of said means being taken from a common point in the emitter circuit of said transistors.
Claim 3
Dependent Claim
14 words
A circuit as in claim 1 wherein said output network comprises an emitter-follower circuit.
Claim 4
Dependent Claim
14 words
A circuit as in claim 1 wherein said means being an active feedback network.
Claim 5
Dependent Claim
49 words
A switching circuit as in claim 1 wherein said means further comprises: at least two resistors each having one end connected to a common point, the other end of each resistor connected to an emitter of each of the two transistors; the resistance value of said resistors being unequal.
Claim 6
Dependent Claim
22 words
A switching circuit as in claim 1 further comprising at least one resistor connected between emitters of each of the said transistors.
Claim 7
Dependent Claim
141 words
A common emitter-type circuit having an input and an output and actuable from one state to another in response to the potential of the input traversing a reference potential, said circuit comprising: a pair of transistors connected in a common emitter-type configuration; an input node being conductively connected to the base region of the first of the said pair of transistors; a first resistor in the emitter circuit of the first of the said pair of transistors and a second resistor in the emitter circuit of the second of the said pair of transistors, said first resistor having a value of resistance greater than that of the said second resistor, the output being at a common point between the said two resistors; and a conductive connection between the base of said second transistor and the collector region of said first transistor.
Claim 8
Dependent Claim
141 words
A common emitter-type circuit having an input and an output and actuable from one state to another in response to the potential of the input traversing a reference potential, said circuit comprising: a pair of transistors connected in a common emitter-type configuration; an input node being conductively connected to the base region of the first of the said pair of transistors; a first resistor in the emitter circuit of the first of the said pair of transistors and a second resistor in the emitter circuit of the second of the said pair of transistors, said first resistor having a value of resistance greater than that of the said second resistor, the output being at a common point between the said two resistors; and a conductive connection between the base of said second transistor and the collector region of said first transistor.
Claim 9
Dependent Claim
26 words
A circuit as in claim 6 wherein said second resistor having a resistance value less than that of said first resistor is replaced by a conductor.
Claim 10
Dependent Claim
206 words
A switching circuit including an active binary element having a reference node and an input node and switchable from one state to another in response to the potential of the input node traversing the potential of the reference node, and active means for varying the potential at the reference node, the improvement wherein said active means comprises: a first transistor having an emitter, base, and collector, an out-of-phase output of said active binary element being conductively connected to the base of said first transistor; a second transistor having a collector, base and emitter, the base of said second transistor being conductively connected to the collector of saId first transistor; a first resistor connected to the emitter of said first transistor; a second resistor connected to the emitter of said second transistor and also connected to said first resistor, forming a common point, the value of resistance of said first resistor being greater than the value of resistance of said second resistor; a third resistor connected to said common point and a first potential source; a fourth resistor connected between the collector of said first transistor and the collector of said second transistor, the collector of said second transistor being also connected to a second potential source.
Claim 11
Dependent Claim
206 words
A switching circuit including an active binary element having a reference node and an input node and switchable from one state to another in response to the potential of the input node traversing the potential of the reference node, and active means for varying the potential at the reference node, the improvement wherein said active means comprises: a first transistor having an emitter, base, and collector, an out-of-phase output of said active binary element being conductively connected to the base of said first transistor; a second transistor having a collector, base and emitter, the base of said second transistor being conductively connected to the collector of saId first transistor; a first resistor connected to the emitter of said first transistor; a second resistor connected to the emitter of said second transistor and also connected to said first resistor, forming a common point, the value of resistance of said first resistor being greater than the value of resistance of said second resistor; a third resistor connected to said common point and a first potential source; a fourth resistor connected between the collector of said first transistor and the collector of said second transistor, the collector of said second transistor being also connected to a second potential source.
Claim 12
Dependent Claim
235 words
A switching circuit including an active binary element having a reference node and an input node and switchable from one state to another in response to the potential of the input node traversing the potential of the reference node, and active means for varying the potential at the reference node, the improvement wherein said active means comprises: a first transistor having an emitter, base, and collector, an out of phase output of said binary element being conductively connected to the base of said first transistor; a second transistor having an emitter, base and collector, the base of said second transistor being conductively connected to the collector of said first transistor; a first resistor connected to the emitter of said first transistor; a second resistor connected to the emitter of said second transistor and also connected to said first resistor, forming a common point, the value of resistance of said first resistor being greater than the value of resistance of said second resistor; a third resistor connected to said common point; a fourth resistor connected to said third resistor and also connected to a first potential source, the output of said active means being taken from a point between said third and fourth resistors; a fifth resistor connected between the collector of said first transistor and the collector of said second transistor, the collector of said second transistor being also connected to a second potential source.
Claim 13
Dependent Claim
235 words
A switching circuit including an active binary element having a reference node and an input node and switchable from one state to another in response to the potential of the input node traversing the potential of the reference node, and active means for varying the potential at the reference node, the improvement wherein said active means comprises: a first transistor having an emitter, base, and collector, an out of phase output of said binary element being conductively connected to the base of said first transistor; a second transistor having an emitter, base and collector, the base of said second transistor being conductively connected to the collector of said first transistor; a first resistor connected to the emitter of said first transistor; a second resistor connected to the emitter of said second transistor and also connected to said first resistor, forming a common point, the value of resistance of said first resistor being greater than the value of resistance of said second resistor; a third resistor connected to said common point; a fourth resistor connected to said third resistor and also connected to a first potential source, the output of said active means being taken from a point between said third and fourth resistors; a fifth resistor connected between the collector of said first transistor and the collector of said second transistor, the collector of said second transistor being also connected to a second potential source.
Claim 14
Dependent Claim
207 words
A switching circuit including an active binary element having a reference node and an input node and switchable from one state to another in response to the potential of the input node traversing the potential of the reference node, and active means for varying the potential at the reference node, the improvement wherein said active means comprises: a first transistor having an emitter, base, and collector, an out-of-phase output of said active binary element being conductively connected to the base of said first transistor; a second transistor having a collector, base, and emitter, the base of said second transistor being conductively connected to the collector of said first transistor; a first resistor connected between the emitter of said first transistor and the emitter of said second transistor; a second resistor connected to a point between the emitter of said second transistor and said first resistor; a third resistor connected to said second resistor and a first potential source, the output of said active means being taken from a point between said second and third resistors, a fourth resistor connected between the collector of said first transistor and the collector of said second transistor, the collector of said second transistor being also connected to a second potential source.
Claim 15
Dependent Claim
207 words
A switching circuit including an active binary element having a reference node and an input node and switchable from one state to another in response to the potential of the input node traversing the potential of the reference node, and active means for varying the potential at the reference node, the improvement wherein said active means comprises: a first transistor having an emitter, base, and collector, an out-of-phase output of said active binary element being conductively connected to the base of said first transistor; a second transistor having a collector, base, and emitter, the base of said second transistor being conductively connected to the collector of said first transistor; a first resistor connected between the emitter of said first transistor and the emitter of said second transistor; a second resistor connected to a point between the emitter of said second transistor and said first resistor; a third resistor connected to said second resistor and a first potential source, the output of said active means being taken from a point between said second and third resistors, a fourth resistor connected between the collector of said first transistor and the collector of said second transistor, the collector of said second transistor being also connected to a second potential source.
References Cited (Backward Citations)
US3509363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |