US4634959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated reference circuit
Assignee: AG Communication Systems Corp
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Filing: 1985-12-16
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Granted: 1987-01-06
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Expires: 2005-12-16
Abstract
Abstract A temperature compensated voltage reference circuit adapted for on chip location with integrated bi-polar linear circuits, where a temperature stable reference voltage is required in the range of 1.2 to 2.0 volts DC. The circuitry requires only a low chip area and presents a high AC impedance, a low operating current drain, and requires no high value resistors or capacitors.
Inventors
- 👤 Eduard F. B. Boeckmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:14
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: 7
Claim 1
Independent Claim
150 words
A temperature compensated voltage reference circuit connected to an input voltage source, said reference circuit comprising; a diode reference string and a current gate serially connected in shunt across said input source; a a primary bias circuit connected in shunt across said input voltage source and including an output connected to said current gate; a secondary bias circuit including an output connected to said current gate; biasing means forsaid at secondary bias circuit connected in shunt across said input voltage source and including an output connected to said secondary bias circuit; said diode reference string and said biasing means for said secondary bias circuit each including a plurality of matching transistors; and a reference voltge output connected to a junction between said reference string and said current gate, said current gate forcing current through the diode reference string to develop a temperature compensated reference voltage at said reference voltage output.
Claim 2
Dependent Claim
150 words
A temperature compensated voltage reference circuit connected to an input voltage source, said reference circuit comprising; a diode reference string and a current gate serially connected in shunt across said input source; a a primary bias circuit connected in shunt across said input voltage source and including an output connected to said current gate; a secondary bias circuit including an output connected to said current gate; biasing means forsaid at secondary bias circuit connected in shunt across said input voltage source and including an output connected to said secondary bias circuit; said diode reference string and said biasing means for said secondary bias circuit each including a plurality of matching transistors; and a reference voltge output connected to a junction between said reference string and said current gate, said current gate forcing current through the diode reference string to develop a temperature compensated reference voltage at said reference voltage output.
Claim 3
Dependent Claim
45 words
A temperature compensated voltage reference circuit as claimed in claim 1, wherein: said diode reference string comprises a plurality of diode connected transistors which, form the final reference voltage of said reference circuit as the summation of forward voltage drops of said diode connected transistors.
Claim 4
Dependent Claim
27 words
A temperature compensated voltage reference circuit as claimed in claim 1, wherein: and current gate comprises a transistor, gating current for output to said diode reference string.
Claim 5
Dependent Claim
37 words
A temperature compensated voltage reference circuit as claimed in claim 1, wherein: said primary bias circuit comprises a transistor and a resistor serially connected across said input voltage source, said transistor providing a single diode drop potential.
Claim 6
Dependent Claim
44 words
A temperature compensated voltage reference circuit as claimed in claim 1, wherein: said secondary bias circuit for said current gate comprises a transistor forming a compensation bias sink path for said current gate, allowing said current gate to pass more current with increasing temperature.
Claim 7
Dependent Claim
44 words
A temperature compensated voltage reference circuit as claimed in claim 5, wherein: said biasing means for said secondary bias circuit comprise a plurality of transistors diode connected in series with a plurality of resistors and including an output connected to said secondary bias 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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |