US3908162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage and temperature compensating source
Assignee: Motorola Solutions Inc
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Filing: 1974-03-01
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Granted: 1975-09-23
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Expires: 1994-03-01
Abstract
Abstract A positive temperature coefficient generator for offsetting negative temperature coefficients normally associated with integrated circuits PN junctions which includes a pair of interconnected circuits. Each circuit includes at least a pair of PN junctions for developing a resultant positive temperature coefficient output signal which is independent of the current levels existing at the circuit PN junctions and which is related only to the ratio of the areas defining the PN circuit junctions.
Inventors
- 👤 Robert R Marley
- 👤 Walter C Seelbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:38
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/30; Y; Y10; Y10S; Y10S323/00; Y10S323/907
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
An integrated circuIt voltage and temperature compensated circuit comprising: a. a reference impedance coupled to a voltage source, said voltage source generating a first and second current; b. a first path coupled to said impedance means for receiving said first current; c. a second path coupled to said reference impedance for receiving said second current; d. said first current path including at least two serially interconnected PN junctions for generating a first differential voltage; e. said second current path including at least two serially interconnected PN junctions for generating a second differential voltage; and f. said reference impedance means being responsive to said first and second differential voltages for generating a positive temperature coefficient voltage.
Claim 2
Dependent Claim
115 words
An integrated circuIt voltage and temperature compensated circuit comprising: a. a reference impedance coupled to a voltage source, said voltage source generating a first and second current; b. a first path coupled to said impedance means for receiving said first current; c. a second path coupled to said reference impedance for receiving said second current; d. said first current path including at least two serially interconnected PN junctions for generating a first differential voltage; e. said second current path including at least two serially interconnected PN junctions for generating a second differential voltage; and f. said reference impedance means being responsive to said first and second differential voltages for generating a positive temperature coefficient voltage.
Claim 3
Dependent Claim
59 words
An integrated circuit voltage and temperature compensated circuit as recited in claim 1 wherein: a. the value of said first differential voltage is substantially independent of the magnitude of the current in said first current path; and b. the value of said second differential voltage is substantially independent of the magnitude of the current in said second current path.
Claim 4
Dependent Claim
95 words
An integrated circuit voltage and temperature compensated circuit as recited in claim 2 wherein: a. said first differential voltage has a magnitude represented by the number M, where M is any positive number representing a ratio of junction related areas of said at least two serially interconnected PN junctions of said first current path; and b. said second differential voltage has a magnitude represented by the number N where N is any positive number representing another ratio of junction related areas of said at least two serially interconnected PN junctions of said second current path.
Claim 5
Dependent Claim
87 words
An integrated circuit voltage and temperature compensated circuit as recited in claim 3 wherein: a. the positive temperature coefficient voltage developed across said reference impedance has a magnitude represented by the product M X N, where M is any positive number representing a ratio of junction related areas of said serially interconnected PN junctions of said first current path, and where N is any positive number representing another ratio of junction related areas of said at least two serially interconnected PN junctions of said second current path.
Claim 6
Dependent Claim
84 words
An integrated circuit voltage and temperature compensated circuit as recited in claim 4 wherein: a. said first circuit path includes first and second interconnected bipolar transistors and wherein said at least two serially interconnected PN junctions are constituted by the base-to-emitter junctions of said first and second interconnected transistors; b. said second current path includes third and fourth interconnected bipolar transistors and wherein said at least two serially interconnected PN junctions are constituted by the base-to-emitter junctions of said third and fourth interconnected transistors.
Claim 7
Dependent Claim
69 words
An integrated circuit voltage and temperature compensated circuit as recited in claim 5 wherein: a. said second and fourth transistors comprise multi-emitter transistors, the ratio of the emitter area of said second transistor to the emitter area of said first transistor being represented by M, the ratio of the emitter area of said fourth transistor with respect to the emitter area of said third transistor being represented by N.
Claim 8
Dependent Claim
49 words
An integrated circuit voltage and temperature compensated circuit as recited in claim 3 further comprising: a. semiconductor means coupled to said voltage source for generating a negative temperature coefficient voltage; b. said semiconductor means being coupled to said reference impedance means for producing a voltage and temperature compensated circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |