US4196404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal oscillator having low power consumption
Assignee: Citizen Watch Co Ltd
•
Filing: 1978-08-31
•
Granted: 1980-04-01
•
Expires: 1998-08-31
Abstract
Abstract Control transistors connected to the amplifier portion of a quartz crystal oscillator circuit are periodically switched between conducting and non-conducting states so that the quartz crystal element is alternately driven and oscillating freely, the output signal from the circuit being gradually attenuated during free oscillation intervals but recovering original amplitude when drive is reapplied and remaining in fixed phase.
Inventors
- 👤 Heihachiro Ebihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:23
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03B5/364; G; G04; G04F; G04F5/00; G04F5/04; G04F5/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
224 words
An oscillator circuit comprising: a quartz crystal vibrator element; a first P-MOS transistor having a drain terminal connected to a first terminal of said quartz crystal vibrator element and having a gate terminal connected to a second terminal of said quartz crystal vibrator element; a first N-MOS transistor having a drain terminal connected to said first terminal of said quartz crystal vibrator element and having a gate terminal connected to said second terminal of said quartz crystal vibrator element; a second P-MOS transistor having a drain terminal connected to a source terminal of said first P-MOS transistor and having a source terminal connected to a high potential of a power source; a second N-MOS transistor having a drain terminal connected to a source terminal of said first N-MOS transistor and having a source terminal connected to a low potential of said power source; and means for generating first and second control signals of mutually opposite phase and of mutually equal frequency of a predetermined periodic frequency lower than that of said quartz crystal vibrator element, said first control signal being applied to a gate terminal of said second P-MOS transistor and said second control signal being applied to a gate terminal of said second N-MOS transistor, said generating means for rendering said second P-MOS and said second N-MOS transistors in the same conductive/nonconductive state.
Claim 2
Dependent Claim
224 words
An oscillator circuit comprising: a quartz crystal vibrator element; a first P-MOS transistor having a drain terminal connected to a first terminal of said quartz crystal vibrator element and having a gate terminal connected to a second terminal of said quartz crystal vibrator element; a first N-MOS transistor having a drain terminal connected to said first terminal of said quartz crystal vibrator element and having a gate terminal connected to said second terminal of said quartz crystal vibrator element; a second P-MOS transistor having a drain terminal connected to a source terminal of said first P-MOS transistor and having a source terminal connected to a high potential of a power source; a second N-MOS transistor having a drain terminal connected to a source terminal of said first N-MOS transistor and having a source terminal connected to a low potential of said power source; and means for generating first and second control signals of mutually opposite phase and of mutually equal frequency of a predetermined periodic frequency lower than that of said quartz crystal vibrator element, said first control signal being applied to a gate terminal of said second P-MOS transistor and said second control signal being applied to a gate terminal of said second N-MOS transistor, said generating means for rendering said second P-MOS and said second N-MOS transistors in the same conductive/nonconductive state.
Claim 3
Dependent Claim
41 words
An oscillator circuit according to claim 1, and further comprising a first resistor connected between said drain and source terminals of said second P-MOS transistor and a second resistor connected between said drain and source terminals of said second N-MOS transistor.
References Cited (Backward Citations)
US3855549A
Cited
US4039973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-01 | 1983-10-01 | 1984-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-01 | 1987-10-01 | 1988-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-01 | 1991-10-01 | 1992-04-01 | $7700.00 | Window Closed / Lapsed |