Patent US1890950A successfully refreshed from Google Patents.
Patent US5459436A successfully refreshed from Google Patents.
US5459436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature compensated crystal oscillator with disable
Assignee: CTS Corp
•
Filing: 1994-08-31
•
Granted: 1995-10-17
•
Expires: 2014-08-31
Abstract
Abstract A temperature compensated crystal oscillator (TCXO) (10) with a disable feature adapted to disable or enable temperature compensation. The TCXO (10) includes a crystal oscillator (12), a temperature measurement and compensation circuit (18), a timing generator (20) and a temperature compensation disable/enable circuit (30) for disabling or enabling temperature compensation updates of the crystal oscillator (12). The TCXO (10) is particularly adapted for use in connection with digital temperature compensated crystal oscillators.
Inventors
- 👤 Gregory Pucci
- 👤 Tim Collins
- 👤 Larry Connell
- 👤 Dennis Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:02
CPC Classifications
H; H03; H03L; H03L1/00; H03L1/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
193 words
A disable/enable circuit for a temperature compensated crystal oscillator having an output frequency determined by a crystal with a predetermined frequency versus temperature characteristic, comprising: a crystal oscillator circuit having an input adapted to receive a signal for changing the oscillator output frequency and an oscillator output; temperature measurement and compensation circuit for measuring the temperature in proximity to the crystal and based thereon, providing a control signal to the crystal oscillator circuit to adjust the output frequency over a predetermined temperature range; a timing generator including an input and an output connected to the temperature measurement and compensation circuit; and a temperature compensation disable/enable circuit including a disable/enable input to actuate the temperature compensation disable/enable circuit and a disable/enable output connected to the timing generator for disabling or enabling temperature compensation updates for the crystal oscillator, the disable/enable input includes an enabled state and a disabled state, wherein when the disable/enable input is placed in the enabled state a substantially immediate temperature compensation update occurs to adjust the oscillator output frequency and when the disable/enable input is in the disabled state no temperature compensation occurs until placed back into the enabled state.
Claim 2
Dependent Claim
193 words
A disable/enable circuit for a temperature compensated crystal oscillator having an output frequency determined by a crystal with a predetermined frequency versus temperature characteristic, comprising: a crystal oscillator circuit having an input adapted to receive a signal for changing the oscillator output frequency and an oscillator output; temperature measurement and compensation circuit for measuring the temperature in proximity to the crystal and based thereon, providing a control signal to the crystal oscillator circuit to adjust the output frequency over a predetermined temperature range; a timing generator including an input and an output connected to the temperature measurement and compensation circuit; and a temperature compensation disable/enable circuit including a disable/enable input to actuate the temperature compensation disable/enable circuit and a disable/enable output connected to the timing generator for disabling or enabling temperature compensation updates for the crystal oscillator, the disable/enable input includes an enabled state and a disabled state, wherein when the disable/enable input is placed in the enabled state a substantially immediate temperature compensation update occurs to adjust the oscillator output frequency and when the disable/enable input is in the disabled state no temperature compensation occurs until placed back into the enabled state.
Claim 3
Dependent Claim
20 words
The disable/enable circuit of claim 1, further comprising an interface connected to the input of the temperature compensation disable/enable circuit.
Claim 4
Dependent Claim
22 words
The disable/enable circuit of claim 2, wherein the interface includes a serial communication bus or at least one user input signal line.
Claim 5
Dependent Claim
22 words
The disable/enable circuit of claim 1, wherein the crystal oscillator circuit includes a voltage dependent reactance element to adjust the output frequency.
Claim 6
Dependent Claim
15 words
The disable/enable circuit of claim 4, wherein the voltage dependent reactance element includes a varactor.
Claim 7
Dependent Claim
16 words
The disable/enable circuit of claim 1, wherein the temperature compensation disable/enable circuit includes a storage element.
Claim 8
Dependent Claim
14 words
The disable/enable circuit of claim 6, wherein the storage element is a D flip-flop.
Claim 9
Dependent Claim
35 words
The disable/enable circuit of claim 1, wherein the temperature compensation disable/enable circuit includes an And gate and a D flip-flop, an output of the And gate is connected to an input of the D flip-flop.
Claim 10
Dependent Claim
23 words
The disable/enable circuit of claim 8, wherein the And gate includes a temperature compensation disable input and an update in progress signal input.
Claim 11
Dependent Claim
20 words
The disable/enable circuit of claim 1, wherein the temperature compensation disable/enable circuit includes a synchronizing circuit and an update-in-progress input.
Claim 12
Dependent Claim
24 words
The disable/enable circuit of claim 10, wherein the update-in-progress input delays disabling temperature compensation updates until the update in progress cycle has been completed.
References Cited (Backward Citations)
US4611181A
Cited
US4746879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-16 | 1999-04-17 | 1999-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-16 | 2003-04-17 | 2003-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-16 | 2007-04-17 | 2007-10-17 | $7700.00 | Window Closed / Lapsed |