US5481227A
Expired / Lapsed
US
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Oscillator, synthesizer tuner circuit and AM synchronous detect circuit employing the oscillator
Assignee: Sony Corp
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Filing: 1995-03-21
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Granted: 1996-01-02
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Expires: 2015-03-21
Abstract
Abstract An oscillator capable of setting a desired frequency by using only two resonators without setting up any additional adjustment processes, and a synthesizer tuner circuit with an AM synchronous detect circuit. The oscillator comprises: a first oscillator oscillating at a desired frequency as a result of inputting a voltage from a parallelly-connected first resonator and first voltage-variable capacitor to a current feedback loop of a first amplifier and controlling a voltage applied to the first voltage-variable capacitor; a second oscillator oscillating at a desired frequency as a result of inputting a voltage from a parallelly-connected second resonator and second voltage-variable capacitor to a current feedback loop of a second amplifier and controlling a voltage applied to the second voltage-variable capacitor; a voltage generator for generating a voltage to be applied to the first voltage-variable capacitor and a voltage to be applied to the second voltage-variable capacitor by comparing outputs from the first and second oscillators; and a controller for making oscillating frequencies for the first and second oscillators coincide in a phase-locked loop constructed so that the polarities of the voltages applied to the first and second voltage-variable capacitors are different.
Inventors
- 👤 Kenji Komori
- 👤 Atsushi Hirabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:59
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/02; H03D; H03D1/00; H03D1/22; H03D1/2281; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/099; H03B; H03B2200/00; H03B2200/003; H03B2200/0036; H03B2200/0058; H03B2200/006; H03B2200/0092; H03B2201/00; H03B2201/02; H03B2201/0208; H03B5/00; H03B5/30; H03B5/32; H03B5/36; H03B5/366
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
184 words
An oscillator outputting a plurality of signals of differing frequencies, comprising: first oscillating means oscillating at a desired frequency in response to a voltage from a first resonator and first voltage-variable capacitor connected in parallel to a first current feedback loop of a first amplifier for controlling a voltage applied to the first voltage-variable capacitor; second oscillating means oscillating at a desired frequency in response to a voltage from a second resonator and second voltage-variable capacitor connected in parallel to a second current feedback loop of a second amplifier for controlling a voltage applied to the second voltage variable capacitor; voltage generating means for generating the voltage applied to the first voltage-variable capacitor and the voltage applied to the second voltage-variable capacitor by comparing an output of the first oscillating means and an output of the second oscillating means; and control means for making an oscillating frequency of the first oscillating means and an oscillating frequency of the second oscillating means coincide in a phase-locked loop constructed such that the polarities of the voltages applied to the first and second voltage-variable capacitors are different.
Claim 2
Dependent Claim
184 words
An oscillator outputting a plurality of signals of differing frequencies, comprising: first oscillating means oscillating at a desired frequency in response to a voltage from a first resonator and first voltage-variable capacitor connected in parallel to a first current feedback loop of a first amplifier for controlling a voltage applied to the first voltage-variable capacitor; second oscillating means oscillating at a desired frequency in response to a voltage from a second resonator and second voltage-variable capacitor connected in parallel to a second current feedback loop of a second amplifier for controlling a voltage applied to the second voltage variable capacitor; voltage generating means for generating the voltage applied to the first voltage-variable capacitor and the voltage applied to the second voltage-variable capacitor by comparing an output of the first oscillating means and an output of the second oscillating means; and control means for making an oscillating frequency of the first oscillating means and an oscillating frequency of the second oscillating means coincide in a phase-locked loop constructed such that the polarities of the voltages applied to the first and second voltage-variable capacitors are different.
Claim 3
Dependent Claim
21 words
The oscillator according to claim 1, wherein a control coefficient of the voltage applied to the second voltage-variable capacitor is variable.
Claim 4
Dependent Claim
16 words
The oscillator according to claim 2, wherein the second voltage-variable capacitor comprises a differential transistor pair.
Claim 5
Dependent Claim
29 words
The oscillator according to claim 3, wherein a phase circuit is formed by connecting a capacitor between the emitters of the differential transistor pair in the second voltage-variable capacitor.
Claim 6
Dependent Claim
229 words
A synthesizer/tuner having an oscillator outputting a plurality of signals of differing frequencies, comprising: first oscillating means oscillating at a desired frequency in response to a voltage from a first resonator and first voltage-variable capacitor connected in parallel to a first current feedback loop of a first amplifier for controlling a voltage applied to the first voltage-variable capacitor; second oscillating means, oscillating at a desired frequency in response to a voltage from a second resonator and second voltage-variable capacitor connected in parallel to a second current feedback loop of a second amplifier for controlling a voltage applied to the second voltage variable capacitor; voltage generating means for generating the voltage applied to the first voltage-variable capacitor and the voltage applied to the second voltage-variable capacitor by comparing an output of the first oscillating means and an output of the second oscillating means; control means for making an oscillating frequency of the first oscillating means and an oscillating frequency of the second oscillating means coincide in a phase-locked loop constructed such that the polarities of the voltages applied to the first and second voltage-variable capacitors are different; a frequency synchronous loop circuit for generating a signal synchronous with the oscillating frequency of the control means; and a frequency converter for converting the frequency of an RF input thereto in response to a signal output from the frequency synchronous loop circuit.
Claim 7
Dependent Claim
229 words
A synthesizer/tuner having an oscillator outputting a plurality of signals of differing frequencies, comprising: first oscillating means oscillating at a desired frequency in response to a voltage from a first resonator and first voltage-variable capacitor connected in parallel to a first current feedback loop of a first amplifier for controlling a voltage applied to the first voltage-variable capacitor; second oscillating means, oscillating at a desired frequency in response to a voltage from a second resonator and second voltage-variable capacitor connected in parallel to a second current feedback loop of a second amplifier for controlling a voltage applied to the second voltage variable capacitor; voltage generating means for generating the voltage applied to the first voltage-variable capacitor and the voltage applied to the second voltage-variable capacitor by comparing an output of the first oscillating means and an output of the second oscillating means; control means for making an oscillating frequency of the first oscillating means and an oscillating frequency of the second oscillating means coincide in a phase-locked loop constructed such that the polarities of the voltages applied to the first and second voltage-variable capacitors are different; a frequency synchronous loop circuit for generating a signal synchronous with the oscillating frequency of the control means; and a frequency converter for converting the frequency of an RF input thereto in response to a signal output from the frequency synchronous loop circuit.
Claim 8
Dependent Claim
21 words
The synthesizer/tuner according to claim 5, wherein a control coefficient of the voltage applied to the second voltage-variable capacitor is variable.
Claim 9
Dependent Claim
16 words
The synthesizer/tuner according to claim 6, wherein the second voltage-variable capacitor comprises a differential transistor pair.
Claim 10
Dependent Claim
29 words
The synthesizer/tuner according to claim 7, wherein a phase circuit is formed by connecting a capacitor between respective emitters of the differential transistor pair in the second voltage-variable capacitor.
Claim 11
Dependent Claim
277 words
An AM synchronous detect circuit having an oscillator outputting a plurality of signals of differing frequencies, comprising: first oscillating means oscillating at a desired frequency in response to a voltage from a first resonator and first voltage-variable capacitor connected in parallel to a first current feedback loop of a first amplifier for controlling a voltage applied to the first voltage-variable capacitor; second oscillating means, oscillating at a desired frequency in response to a voltage from a second resonator and second voltage-variable capacitor connected in parallel to a second current feedback loop of a second amplifier for controlling a voltage applied to the second voltage variable capacitor; voltage generating means for generating the voltage applied to the first voltage-variable capacitor and the voltage applied to the second voltage-variable capacitor by comparing an output of the first oscillating means and an output of the second oscillating means; and control means for making an oscillating frequency of the first oscillating means and an oscillating frequency of the second oscillating means coincide in a phase-locked loop constructed such that the polarities of the voltages applied to the first and second voltage-variable capacitors are different; a frequency synchronous loop circuit for generating a signal synchronous with the oscillating frequency of the control means; a frequency converter for converting the frequency of an RF input thereto in response to a signal output from the frequency synchronous loop circuit; a PLL circuit operating such that the phase of an output and the phase of a wave modulated input for the second oscillating means coincide; and AM detector means for detecting the wave modulated input in response to the output of the first oscillating means.
Claim 12
Dependent Claim
277 words
An AM synchronous detect circuit having an oscillator outputting a plurality of signals of differing frequencies, comprising: first oscillating means oscillating at a desired frequency in response to a voltage from a first resonator and first voltage-variable capacitor connected in parallel to a first current feedback loop of a first amplifier for controlling a voltage applied to the first voltage-variable capacitor; second oscillating means, oscillating at a desired frequency in response to a voltage from a second resonator and second voltage-variable capacitor connected in parallel to a second current feedback loop of a second amplifier for controlling a voltage applied to the second voltage variable capacitor; voltage generating means for generating the voltage applied to the first voltage-variable capacitor and the voltage applied to the second voltage-variable capacitor by comparing an output of the first oscillating means and an output of the second oscillating means; and control means for making an oscillating frequency of the first oscillating means and an oscillating frequency of the second oscillating means coincide in a phase-locked loop constructed such that the polarities of the voltages applied to the first and second voltage-variable capacitors are different; a frequency synchronous loop circuit for generating a signal synchronous with the oscillating frequency of the control means; a frequency converter for converting the frequency of an RF input thereto in response to a signal output from the frequency synchronous loop circuit; a PLL circuit operating such that the phase of an output and the phase of a wave modulated input for the second oscillating means coincide; and AM detector means for detecting the wave modulated input in response to the output of the first oscillating means.
Claim 13
Dependent Claim
24 words
The AM synchronous detect circuit according to claim 9, wherein a control coefficient of the voltage applied to the second voltage-variable capacitor is variable.
Claim 14
Dependent Claim
19 words
The AM synchronous detect circuit according to claim 10, wherein the second voltage-variable capacitor comprises a differential transistor pair.
Claim 15
Dependent Claim
32 words
The AM synchronous detect circuit according to claim 11, wherein a phase circuit is formed by connecting a capacitor between respective emitters of the differential transistor pair in the second voltage-variable capacitor.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-01-01 | 1999-07-03 | 2000-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-01 | 2003-07-03 | 2004-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-01 | 2007-07-03 | 2008-01-02 | $7700.00 | Window Closed / Lapsed |