US3889211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
MOS field effect transistor crystal oscillator
Assignee: Suwa Seikosha KK
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Filing: 1973-08-28
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Granted: 1975-06-10
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Expires: 1993-08-28
Abstract
Abstract A quartz crystal oscillator circuit for use in electronic timepieces and capable of self-oscillation at a constant operating point in response to a self-biasing circuit is provided. MOS field effect transistor means are provided for feeding back the output voltage of a drain terminal of a cascaded series of inverter stages comprised of MOS field effect transistors to the input of a gate terminal of such cascaded inverter stages to provide self bias to the cascaded inverter circuit. The feed-back resistance of the MOS field effect transistor means is used to set the operating point of the circuit when a high resistance is required. The use of MOS field effect transistors therein also provides increased stability of the oscillating frequency during fluctuations in temperature.
Inventors
- 👤 Shinji Morozumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:45
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/353; H03K3/354; H03K3/3545; G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03B5/364; H03B5/02; H03B5/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A quartz crystal oscillator circuit comprising a cascaded inverter circuit said cascade circuit including n complementary inverter stages connected in cascade, where n is an odd integer, and having an output terminal at the output of a last stage and an input terminal at the input of a first stage, a quartz crystal vibrator coupled between said last stage output and said first stage input to form a feed-back circuit therebetween, and biasing means in said feed-back circuit for setting the operating point of said oscillator circuit, said biasing means including two complementary parallel coupled integrated circuit field effect transistors, the source electrodes thereof being coupled to said input terminal and the drain electrodes thereof being coupled to said output terminal.
Claim 2
Dependent Claim
121 words
A quartz crystal oscillator circuit comprising a cascaded inverter circuit said cascade circuit including n complementary inverter stages connected in cascade, where n is an odd integer, and having an output terminal at the output of a last stage and an input terminal at the input of a first stage, a quartz crystal vibrator coupled between said last stage output and said first stage input to form a feed-back circuit therebetween, and biasing means in said feed-back circuit for setting the operating point of said oscillator circuit, said biasing means including two complementary parallel coupled integrated circuit field effect transistors, the source electrodes thereof being coupled to said input terminal and the drain electrodes thereof being coupled to said output terminal.
Claim 3
Dependent Claim
61 words
A quartz crystal oscillator circuit as claimed in claim 1, wherein each of said inverter stages includes at least one pair of complementary integrated MOS field effect transistors and including means for controlling phase at the output side of at least one of said inverter stages so as to apply a bias voltage to said circuit through said phase controlling means.
Claim 4
Dependent Claim
26 words
A quartz crystal oscillator circuit as recited in claim 2, wherein said phase controlling means comprises at least a pair of complementary parallel connected MOS transistors.
Claim 5
Dependent Claim
138 words
A quartz crystal oscillator circuit comprising a quartz crystal vibrator, at least one inverter stage having a drain output terminal at the last stage thereof and a gate input terminal at the first stage thereof with said at least one stage including a complementary coupling of a P-channel transistor and an N-channel transistor, the drain output terminal being coupled to the gate input terminal through the connection of said quartz crystal vibrator to said terminals, capacitor means coupled between said output drain terminal and ground and further capacitor means coupled between the gate input terminal of the first stage and ground, two further complementary parallel coupled field effect transistors, and said gate input terminal being coupled through said further field effect transistors to said drain output terminal to set a stable operating point for said oscillating complementary transistors.
Claim 6
Dependent Claim
138 words
A quartz crystal oscillator circuit comprising a quartz crystal vibrator, at least one inverter stage having a drain output terminal at the last stage thereof and a gate input terminal at the first stage thereof with said at least one stage including a complementary coupling of a P-channel transistor and an N-channel transistor, the drain output terminal being coupled to the gate input terminal through the connection of said quartz crystal vibrator to said terminals, capacitor means coupled between said output drain terminal and ground and further capacitor means coupled between the gate input terminal of the first stage and ground, two further complementary parallel coupled field effect transistors, and said gate input terminal being coupled through said further field effect transistors to said drain output terminal to set a stable operating point for said oscillating complementary transistors.
Claim 7
Dependent Claim
124 words
A quartz crystal oscillator circuit comprising a quartz crystal vibrator, at least one inverter stage having a drain output terminal at the last stage thereof and a gate input terminal at the first stage thereof with said at least one stage including a complementary coupling of a P-channel transistor and an N-channel transistor, feed-back circuit means including impedance means coupled in parallel to said quartz crystal vibrator,two further parallel coupled field effect transistors coupled in series with said parallel coupled quartz crystal vibrator and impedance means, and capacitor means coupled between ground and a node defining the series coupling of said quartz crystal vibrator with said further transistors, said drain output terminal being coupled through said feed-back circuit means to said gate input terminal.
Claim 8
Dependent Claim
124 words
A quartz crystal oscillator circuit comprising a quartz crystal vibrator, at least one inverter stage having a drain output terminal at the last stage thereof and a gate input terminal at the first stage thereof with said at least one stage including a complementary coupling of a P-channel transistor and an N-channel transistor, feed-back circuit means including impedance means coupled in parallel to said quartz crystal vibrator,two further parallel coupled field effect transistors coupled in series with said parallel coupled quartz crystal vibrator and impedance means, and capacitor means coupled between ground and a node defining the series coupling of said quartz crystal vibrator with said further transistors, said drain output terminal being coupled through said feed-back circuit means to said gate input terminal.
Claim 9
Dependent Claim
24 words
A quartz crystal oscillator circuit as recited in claim 5, wherein said impedance means includes a pair of parallel connected MOS field effect transistors.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |