US4328571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid start oscillator latch
Assignee: Texas Instruments Inc
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Filing: 1979-09-07
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Granted: 1982-05-04
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Expires: 1999-09-07
Abstract
Abstract A rapid start oscillator latch circuit for avoiding long start up time while maintaining minimum operating power for a crystal oscillator in an electronic watch. The oscillator is operated at a relatively high gain immediately after power is applied and until the oscillator is running, after which the oscillator is caused to operate under the normally preferred conditions. A power up pulse sets a latch and the latch is reset by either a pulse from the prescaler or a manual input. When the latch is set, the oscillator circuit is modified for quick start-up. After the oscillator is running, it activates the prescaler, and after several cycles of clock inputs to the prescaler, an output from the prescaler or a manual input resets the latch and the oscillator is returned to its normal operating condition.
Inventors
- 👤 Robert T. Noble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:32
CPC Classifications
G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; G04G; G04G19/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
185 words
An oscillator system comprising: an oscillator means for generating repetitive oscillator signals having a resonance means and a selectable gain integrated injection logic amplifier operatively connected therewith, the gain of said selectable gain amplifier being directly proportional to an injection current; a latch circuit having a set state and a reset state; a power source for said oscillator system; a power up clear means responsive to the connection of said power source to said oscillator system for setting said latch circuit; a counting means responsive to said oscillator signals for resetting said latch circuit upon receipt of a predetermined number of said oscillator signals; and a current regulator means responsive to said state of said latch circuit for causing said injection current of said selectable gain amplifier to have a high value when said latch circuit is in said set state and a low value when said latch circuit is in said reset state, whereby said selectable gain amplifier has a high gain when said latch circuit is in said set state and a low gain when said latch circuit is in said reset state.
Claim 2
Dependent Claim
185 words
An oscillator system comprising: an oscillator means for generating repetitive oscillator signals having a resonance means and a selectable gain integrated injection logic amplifier operatively connected therewith, the gain of said selectable gain amplifier being directly proportional to an injection current; a latch circuit having a set state and a reset state; a power source for said oscillator system; a power up clear means responsive to the connection of said power source to said oscillator system for setting said latch circuit; a counting means responsive to said oscillator signals for resetting said latch circuit upon receipt of a predetermined number of said oscillator signals; and a current regulator means responsive to said state of said latch circuit for causing said injection current of said selectable gain amplifier to have a high value when said latch circuit is in said set state and a low value when said latch circuit is in said reset state, whereby said selectable gain amplifier has a high gain when said latch circuit is in said set state and a low gain when said latch circuit is in said reset state.
Claim 3
Dependent Claim
191 words
An oscillator system comprising: an oscillator means for generating repetitive oscillator signals having a resonance means and a selectable gain complimentary metal oxide semiconductor amplifier having a variable series output resistor, the gain of said selectable gain amplifier being inversely proportional to the resistance of said variable series output resistor; a latch circuit having a set state and a reset state; a power source for said oscillator system; a power up clear means responsive to the connection of said power source to said oscillator system for setting said latch circuit; a counting means responsive to said oscillator signals for resetting said latch circuit upon receipt of a predetermined number of said oscillator signals; and a resistance control means responsive to said state of said latch circuit for causing said variable series output resistor to have a low resistance when said latch circuit is in said set state and a high resistance when said latch circuit is in said reset state, whereby said selectable gain amplifier has a high gain when said latch circuit is in said set state and a low gain when said latch circuit is in said reset state.
Claim 4
Dependent Claim
191 words
An oscillator system comprising: an oscillator means for generating repetitive oscillator signals having a resonance means and a selectable gain complimentary metal oxide semiconductor amplifier having a variable series output resistor, the gain of said selectable gain amplifier being inversely proportional to the resistance of said variable series output resistor; a latch circuit having a set state and a reset state; a power source for said oscillator system; a power up clear means responsive to the connection of said power source to said oscillator system for setting said latch circuit; a counting means responsive to said oscillator signals for resetting said latch circuit upon receipt of a predetermined number of said oscillator signals; and a resistance control means responsive to said state of said latch circuit for causing said variable series output resistor to have a low resistance when said latch circuit is in said set state and a high resistance when said latch circuit is in said reset state, whereby said selectable gain amplifier has a high gain when said latch circuit is in said set state and a low gain when said latch circuit is in said reset state.
Claim 5
Dependent Claim
52 words
The oscillator system as claimed in claim 2, wherein: said variable series output resistor comprises a first fixed resistance portion connected in series with a second fixed resistance portion; and said resistance control means comprises means for shorting said first fixed resistance portion when said latch circuit is in said set state.
Claim 6
Dependent Claim
195 words
A portable, battery operable electronic watch having a display and an oscillator system comprising: an oscillator means for generating repetitive oscillator signals having a resonance means and a selectable gain integrated injection logic amplifier operatively connected therewith, the gain of said selectable gain amplifier being directly proportional to an injection current; a latch circuit having a set state and a reset state; a power source for said oscillator system; a power up clear means responsive to the connection of said power source to said oscillator system for setting said latch circuit; a counting means responsive to said oscillator signals for resetting said latch circuit upon receipt of a predetermined number of said oscillator signals; and a current regulator means responsive to said state of said latch circuit for causing said injection current of said selectable gain amplifier to have a high value when said latch circuit is in said set state and a low value when said latch circuit is in said reset state, whereby said selectable gain amplifier has a high gain when said latch circuit is in said set state and a low gain when said latch circuit is in said reset state.
Claim 7
Dependent Claim
195 words
A portable, battery operable electronic watch having a display and an oscillator system comprising: an oscillator means for generating repetitive oscillator signals having a resonance means and a selectable gain integrated injection logic amplifier operatively connected therewith, the gain of said selectable gain amplifier being directly proportional to an injection current; a latch circuit having a set state and a reset state; a power source for said oscillator system; a power up clear means responsive to the connection of said power source to said oscillator system for setting said latch circuit; a counting means responsive to said oscillator signals for resetting said latch circuit upon receipt of a predetermined number of said oscillator signals; and a current regulator means responsive to said state of said latch circuit for causing said injection current of said selectable gain amplifier to have a high value when said latch circuit is in said set state and a low value when said latch circuit is in said reset state, whereby said selectable gain amplifier has a high gain when said latch circuit is in said set state and a low gain when said latch circuit is in said reset state.
Claim 8
Dependent Claim
201 words
A portable, battery operable electronic watch having a display and an oscillator system comprising: an oscillator means for generating repetitive oscillator signals having a resonance means and a selectable gain complimentary metal oxide semiconductor amplifier having a variable series output resistor, the gain of said selectable gain amplifier being inversely proportional to the resistance of said variable series output resistor; a latch circuit having a set state and a reset state; a power source for said oscillator system; a power up clear means responsive to the connection of said power source to said oscillator system for setting said latch circuit; a counting means responsive to said oscillator signals for resetting said latch circuit upon receipt of a predetermined number of said oscillator signals; and a resistance control means responsive to said state of said latch circuit for causing said variable series output resistor to have a low resistance when said latch circuit is in said set state and a high resistance when said latch circuit is in said reset state, whereby said selectable gain amplifier has a high gain when said latch circuit is in said set state and a low gain when said latch circuit is in said reset state.
Claim 9
Dependent Claim
201 words
A portable, battery operable electronic watch having a display and an oscillator system comprising: an oscillator means for generating repetitive oscillator signals having a resonance means and a selectable gain complimentary metal oxide semiconductor amplifier having a variable series output resistor, the gain of said selectable gain amplifier being inversely proportional to the resistance of said variable series output resistor; a latch circuit having a set state and a reset state; a power source for said oscillator system; a power up clear means responsive to the connection of said power source to said oscillator system for setting said latch circuit; a counting means responsive to said oscillator signals for resetting said latch circuit upon receipt of a predetermined number of said oscillator signals; and a resistance control means responsive to said state of said latch circuit for causing said variable series output resistor to have a low resistance when said latch circuit is in said set state and a high resistance when said latch circuit is in said reset state, whereby said selectable gain amplifier has a high gain when said latch circuit is in said set state and a low gain when said latch circuit is in said reset state.
Claim 10
Dependent Claim
198 words
A portable, battery operable electronic watch according to claim 5, wherein: an oscillator means for generating repetitive oscillator signals having a resonance means and a selectable gain complimentary metal oxide semiconductor amplifier having a variable series output resistor, the gain of said selectable gain amplifier being indirectly proportional to the resistance of said variable series output resistor; a latch circuit having a set state and a reset state; a power source for said oscillator system; a power up clear means responsive to the connection of said power source to said oscillator system for setting said latch circuit; a counting means responsive to said oscillator signals for resetting said latch circuit upon receipt of a predetermined number of said oscillator signals; and a resistance control means responsive to said state of said latch circuit for causing said variable series output resistor to have a low resistance when said latch circuit is in said set state and a high resistance when said latch circuit is in said reset state, whereby said selectable gain amplifier has a high gain when said latch circuit is in said set state and a low gain when said latch circuit is in said reset state.
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) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |