US4333171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic timepiece with diffusion resistor for compensating threshold variations
Assignee: Citizen Watch Co Ltd
•
Filing: 1980-08-27
•
Granted: 1982-06-01
•
Expires: 2000-08-27
Abstract
Abstract An electronic timepiece comprising a quartz crystal oscillator for producing a time standard signal, a frequency divider, and a display driver. The electronic circuit comprises a digital logic circuit employing a complementary MOS integrated circuit (CMOS·IC). A diffusion resistor is formed in the N-type substrate of the CMOS transistor of the CMOS·IC by diffusing an impurity at the same time with the diffusion of the P-well for the N-channel MOS transistor of the CMOS transistor. Supply voltage of a battery is supplied to a part of the CMOS·IC through the diffusion resistor, whereby variation of the threshold voltage of the CMOST may be compensated.
Inventors
- 👤 Yasuhiko Nishikubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:27
CPC Classifications
G; G04; G04G; G04G19/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
An electronic timepiece comprising: an electronic circuit unit including, an oscillator for producing a time standard signal, a frequency divider for dividing the output signal of said oscillator, and a display driver, said electronic circuit unit being composed of a CMOS integrated circuit; a display device connected to said electronic circuit unit, a voltage supply connected to said electronic circuit unit; a resistor formed in the N-type substrate of a CMOS transistor within said CMOS integrated circuit at the same time with the diffusion of the P-well for the N-channel MOS transistor of said CMOS transistor, and a voltage supply circuit including said resistor and connecting the voltage supply to said electronic circuit unit for supplying the supply voltage from said voltage supply to a part of said CMOS integrated circuit via said resistor.
Claim 2
Dependent Claim
134 words
An electronic timepiece comprising: an electronic circuit unit including, an oscillator for producing a time standard signal, a frequency divider for dividing the output signal of said oscillator, and a display driver, said electronic circuit unit being composed of a CMOS integrated circuit; a display device connected to said electronic circuit unit, a voltage supply connected to said electronic circuit unit; a resistor formed in the N-type substrate of a CMOS transistor within said CMOS integrated circuit at the same time with the diffusion of the P-well for the N-channel MOS transistor of said CMOS transistor, and a voltage supply circuit including said resistor and connecting the voltage supply to said electronic circuit unit for supplying the supply voltage from said voltage supply to a part of said CMOS integrated circuit via said resistor.
Claim 3
Dependent Claim
50 words
An electronic timepiece according to claim 1 wherein said CMOS integrated circuit comprises a CMOS transistor having a lower threshold voltage than the other CMOS transistor and said voltage supply circuit is arranged to supply the supply voltage to said CMOS transistor having a lower threshold voltage through said resistor.
Claim 4
Dependent Claim
26 words
An electronic timepiece according to claim 1 further comprising a switch for short-circuiting said resistor, and means for closing said switch when the supply voltage decreases.
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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |