US4064468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low voltage compensator for power supply in a complementary MOS transistor crystal oscillator circuit
Assignee: Sharp Corp
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Filing: 1976-08-26
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Granted: 1977-12-20
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Expires: 1996-08-26
Abstract
Abstract A resistor is connected to the source of a C-MOS inverter included within a crystal oscillator circuit in order to reduce the power dissipation in the crystal oscillator circuit. A switching transistor responsive to the voltage reduction of a power supply source is connected to said resistor in a parallel fashion, thereby shunting the resistor when the power supply level is below a predetermined value.
Inventors
- 👤 Kiyoshi Kumata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:05
CPC Classifications
H; H03; H03L; H03L1/00; G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03K; H03K3/00; H03K3/02; H03K3/027; H03K3/03; H03K3/0307
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
In a complementary MOS transistor crystal oscillator circuit including two power supply terminals, a C-MOS inverter connected across said two power supply terminals, a quartz crystal vibrator connected between an input terminal and an output terminal of said C-MOS inverter, and a source resistor connected between the source of one transistor of the C-MOS inverter and one of said two power supply terminals, the improvement comprising: switching means connected in parallel with the source resistor for shunting said source resistor when said switching means is closed; and control means for closing the switching means when the power supply voltage is below a predetermined value.
Claim 2
Dependent Claim
104 words
In a complementary MOS transistor crystal oscillator circuit including two power supply terminals, a C-MOS inverter connected across said two power supply terminals, a quartz crystal vibrator connected between an input terminal and an output terminal of said C-MOS inverter, and a source resistor connected between the source of one transistor of the C-MOS inverter and one of said two power supply terminals, the improvement comprising: switching means connected in parallel with the source resistor for shunting said source resistor when said switching means is closed; and control means for closing the switching means when the power supply voltage is below a predetermined value.
Claim 3
Dependent Claim
38 words
The crystal oscillator circuit of claim 1, wherein the source resistor is connected between the source of an N-channel transistor of the C-MOS inverter and a grounded power supply terminal, and the switching means is an N-type transistor.
Claim 4
Dependent Claim
175 words
In a complementary MOS transistor crystal oscillator circuit including two power supply terminals, a C-MOS inverter connected across said two power supply terminals, a quartz crystal vibrator connected between an input terminal and an output terminal of said C-MOS inverter, a first source resistor having one end connected to the source of the N-channel transistor of the C-MOS inverter and the other end connected to one of said power supply terminals, and a second source resistor having one end connected to the source of the P-channel transistor of the C-MOS inverter and the other end connected to the other power supply terminal, the improvement comprising: a first switching means connected in parallel with said first source resistor for shunting said first source resistor when said switching means is closed; a second switching means connected in parallel with said second source resistor for shunting said second source resistor when said second switching means is closed; and control means for closing said first and second switching means when the power supply voltage is below a predetermined value.
Claim 5
Dependent Claim
175 words
In a complementary MOS transistor crystal oscillator circuit including two power supply terminals, a C-MOS inverter connected across said two power supply terminals, a quartz crystal vibrator connected between an input terminal and an output terminal of said C-MOS inverter, a first source resistor having one end connected to the source of the N-channel transistor of the C-MOS inverter and the other end connected to one of said power supply terminals, and a second source resistor having one end connected to the source of the P-channel transistor of the C-MOS inverter and the other end connected to the other power supply terminal, the improvement comprising: a first switching means connected in parallel with said first source resistor for shunting said first source resistor when said switching means is closed; a second switching means connected in parallel with said second source resistor for shunting said second source resistor when said second switching means is closed; and control means for closing said first and second switching means when the power supply voltage is below a predetermined value.
Claim 6
Dependent Claim
25 words
The crystal oscillator circuit of claim 3, wherein the first switching means is an N-type transistor, and the second switching means is a P-type transistor.
References Cited (Backward Citations)
US3725822A
Cited
US3855549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |