Patent US5212460A successfully refreshed from Google Patents.
US5212460A
Expired / Lapsed
US
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Crystal oscillation circuit with voltage regulating circuit
Assignee: NEC Corp
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Filing: 1992-01-10
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Granted: 1993-05-18
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Expires: 2012-01-10
Abstract
Abstract A crystal oscillation circuit has a constant-current load type inverter circuit receiving a regulated supply voltage from a voltage regulating circuit and functioning as an inverting amplifier for oscillation; a feedback circuit connected between an input and an output terminal of the inverter circuit and including a resistor and capacitors; and a crystal resonator connected between the input and output terminals of the inverter circuit. The inverter circuit is formed by a constant-current source and a P-channel type MOS-FET or an N-channel type MOS-FET. As the supply voltage from the voltage regulating circuit necessary as an oscillation starting voltage can be set at a low level, the current consumption of the overall oscillation circuit can be effectively reduced.
Inventors
- 👤 Akio Tamagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:35
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03B5/362
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A crystal oscillation circuit comprising: a voltage regulating circuit (11) for outputting a predetermined regulated output voltage; a constant-current load type inverter circuit (12) having a constant-current source (14) and a P-channel MOS field effect transistor (13) having a source electrode connected to an output terminal of said voltage regulating circuit so as to receive said predetermined regulated output voltage; a crystal resonator (16) connected between an input and an output terminal (53,54) of said inverter circuit; and a feedback circuit connected between said input and output terminals of said inverter circuit and having a resistor (15) and capacitors (17,18).
Claim 2
Dependent Claim
100 words
A crystal oscillation circuit comprising: a voltage regulating circuit (11) for outputting a predetermined regulated output voltage; a constant-current load type inverter circuit (12) having a constant-current source (14) and a P-channel MOS field effect transistor (13) having a source electrode connected to an output terminal of said voltage regulating circuit so as to receive said predetermined regulated output voltage; a crystal resonator (16) connected between an input and an output terminal (53,54) of said inverter circuit; and a feedback circuit connected between said input and output terminals of said inverter circuit and having a resistor (15) and capacitors (17,18).
Claim 3
Dependent Claim
32 words
A crystal oscillation circuit according to claim 1, in which said crystal resonator and said capacitors constitute a π-type feedback circuit connected between said input and output terminals of said inverter circuit.
Claim 4
Dependent Claim
100 words
A crystal oscillation circuit comprising: a voltage regulating circuit (21) for outputting a predetermined regulated output voltage; a constant-current load type inverter circuit (22) having a constant-current source (24) and an N-channel MOS field effect transistor (23) having a source electrode connected to an output terminal of said voltage regulating circuit so as to receive said predetermined regulated output voltage; a crystal resonator (26) connected between an input and an output terminal (55,56) of said inverter circuit; and a feedback circuit connected between said input and output terminals of said inverter circuit and having a resistor (25) and capacitors (27,28).
Claim 5
Dependent Claim
100 words
A crystal oscillation circuit comprising: a voltage regulating circuit (21) for outputting a predetermined regulated output voltage; a constant-current load type inverter circuit (22) having a constant-current source (24) and an N-channel MOS field effect transistor (23) having a source electrode connected to an output terminal of said voltage regulating circuit so as to receive said predetermined regulated output voltage; a crystal resonator (26) connected between an input and an output terminal (55,56) of said inverter circuit; and a feedback circuit connected between said input and output terminals of said inverter circuit and having a resistor (25) and capacitors (27,28).
Claim 6
Dependent Claim
32 words
A crystal oscillation circuit according to claim 3, in which said crystal resonator and said capacitors constitute a π-type feedback circuit connected between said input and output terminals of said inverter circuit.
References Cited (Backward Citations)
US4208639A
Cited
US4956618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |