Patent US4523217A successfully refreshed from Google Patents.
US4523217A
Expired / Lapsed
US
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Solar powered circuit having CMOS and bipolar transistors
Assignee: Sharp Corp
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Filing: 1983-05-17
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Granted: 1985-06-11
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Expires: 2003-05-17
Abstract
Abstract N-stage bipolar transistors are provided in a semiconductor substrate by using a manufacturing process of a CMOS LSI used for driving a solar powered electronic appliance. A reference voltage from a solar cell is applied to a base of a first bipolar transistor, and bases of i-th (i≦n) bipolar transistors are connected to emitters of (i-1)-th bipolar transistors, thereby providing a constant voltage circuit in the semiconductor substrate.
Inventors
- 👤 Mitsuo Jibu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:57
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/20; G05F3/205; H; H10; H10D; H10D84/00; H10D84/80; H10D84/82; H10D84/83; H10D84/85; H10D89/00; H10D89/211; H10D89/311; H10F; H10F19/00; H10F19/50; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y10; Y10S; Y10S136/00; Y10S136/291; Y10S136/293
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
132 words
A circuit powered by a solar cell for use in an electronic appliance comprising: appliance control circuit means including a first conductivity type semiconductor substrate having p and n channel complementary MOS transistors; and constant voltage control circuit means for supplying a constant reference voltage to said appliance circuit including N (N≧2) bipolar transistors provided in the same said semiconductor substrate, said semiconductor substrate serving as a collector region, each transistor including a second conductivity type base region formed in said collector region and a first conductivity type emitter region formed in said base region, the base region of said first bipolar transistor being connected to a reference potential provided by said solar cell, the base regions of i-th (i≦N) bipolar transistors being connected to the emitter regions of (i-1)-th bipolar transistors.
Claim 2
Dependent Claim
132 words
A circuit powered by a solar cell for use in an electronic appliance comprising: appliance control circuit means including a first conductivity type semiconductor substrate having p and n channel complementary MOS transistors; and constant voltage control circuit means for supplying a constant reference voltage to said appliance circuit including N (N≧2) bipolar transistors provided in the same said semiconductor substrate, said semiconductor substrate serving as a collector region, each transistor including a second conductivity type base region formed in said collector region and a first conductivity type emitter region formed in said base region, the base region of said first bipolar transistor being connected to a reference potential provided by said solar cell, the base regions of i-th (i≦N) bipolar transistors being connected to the emitter regions of (i-1)-th bipolar transistors.
Claim 3
Dependent Claim
11 words
The circuit of claim 1, wherein said appliance is a calculator.
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |