Patent US5598130A successfully refreshed from Google Patents.
US5598130A
Expired / Lapsed
US
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Phase modulator capable of individually defining modulation degree and modulation frequency
Assignee: Anritsu Corp
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Filing: 1995-10-05
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Granted: 1997-01-28
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Expires: 2015-10-05
Abstract
Abstract An FM signal generator generates an FM signal obtained by frequency-modulating a reference frequency signal with a modulating frequency signal. A first mixer mixes the FM signal and an input signal having a predetermined carrier frequency and outputs a pair of frequency signals having sum and difference frequencies thereof. A first signal extracting unit extracts one of the pair of frequency signals as an intermediate frequency signal. A delay circuit delays the extracted intermediate frequency signal by a predetermined time. A second mixer mixes the delayed intermediate frequency signal and the FM signal and outputs a pair of frequency signals having sum and difference frequencies. A second signal extracting unit extracts the frequency signal of the pair of frequency signals which corresponds to the carrier frequency component as a phase-modulated signal. The modulation degree and modulation frequency in phase modulation for the phase-modulated signal can be set in wide ranges.
Inventors
- 👤 Etsuji Mesuda
- 👤 Osamu Tagiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:59
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/06
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
171 words
A phase modulator comprising: FM signal generating means for generating an FM signal obtained by frequency-modulating a reference frequency signal with a modulating frequency signal in order to set a modulation degree and a modulation frequency in phase modulation; first frequency conversion means for mixing an input signal having a predetermined carrier frequency with the FM signal from said FM signal generating means; first signal extracting means for extracting one of upper and lower sideband signals obtained from said first frequency conversion means as an intermediate frequency signal; delay means for delaying the intermediate frequency signal from said first signal extracting means by a predetermined time in order to set the modulation degree in said phase modulator; second frequency conversion means for mixing the intermediate frequency signal delayed by said delay means with the FM signal from said FM signal generating means; and second signal extracting means for extracting a frequency signal corresponding to the carrier frequency component of upper and lower sideband signals obtained from said second frequency conversion means.
Claim 2
Dependent Claim
171 words
A phase modulator comprising: FM signal generating means for generating an FM signal obtained by frequency-modulating a reference frequency signal with a modulating frequency signal in order to set a modulation degree and a modulation frequency in phase modulation; first frequency conversion means for mixing an input signal having a predetermined carrier frequency with the FM signal from said FM signal generating means; first signal extracting means for extracting one of upper and lower sideband signals obtained from said first frequency conversion means as an intermediate frequency signal; delay means for delaying the intermediate frequency signal from said first signal extracting means by a predetermined time in order to set the modulation degree in said phase modulator; second frequency conversion means for mixing the intermediate frequency signal delayed by said delay means with the FM signal from said FM signal generating means; and second signal extracting means for extracting a frequency signal corresponding to the carrier frequency component of upper and lower sideband signals obtained from said second frequency conversion means.
Claim 3
Dependent Claim
46 words
A modulator according to claim 1, wherein said FM signal generating means comprises: a modulating signal generation circuit for generating a modulating frequency signal; and an FM modulation circuit for frequency-modulating the modulating frequency signal from said modulating signal generation circuit with the reference frequency signal.
Claim 4
Dependent Claim
39 words
A modulator according to claim 2, wherein said FM modulation circuit comprises a voltage-controlled oscillator in which an oscillation frequency is changed centered on a predetermined reference frequency in accordance with an amplitude value of the modulating frequency signal.
Claim 5
Dependent Claim
31 words
A modulator according to claim 3, wherein said voltage-controlled oscillator includes a current control multivibrator whose oscillation frequency is changed in accordance with the amplitude value of the modulating frequency signal.
Claim 6
Dependent Claim
29 words
A modulator according to claim 1, wherein said first signal extracting means includes a low-pass filter for filtering a lower sideband signal of the upper and lower sideband signals.
Claim 7
Dependent Claim
22 words
A modulator according to claim 1, wherein said delay means includes a signal line having a length corresponding to the predetermined time.
Claim 8
Dependent Claim
21 words
A modulator according to claim 1, wherein said second signal extracting means includes a bandpass filter having predetermined pass band characteristics.
Claim 9
Dependent Claim
173 words
A phase modulator comprising: FM signal generating means for generating an FM signal obtained by frequency-modulating a reference frequency signal with a modulating frequency signal in order to variably set a modulation degree and a modulation frequency in phase modulation; first frequency conversion means for mixing an input signal having a predetermined carrier frequency with the FM signal from said FM signal generating means; first signal extracting means for extracting one of upper and lower sideband signals obtained from said first frequency conversion means as an intermediate frequency signal; delay means for delaying the intermediate frequency signal from said first signal extracting means by a predetermined time in order to variably set the modulation degree in said phase modulator; second frequency conversion means for mixing the intermediate frequency signal delayed by said delay means with the FM signal from said FM signal generating means; and second signal extracting means for extracting a frequency signal corresponding to the carrier frequency component of upper and lower sideband signals obtained from said second frequency conversion means.
Claim 10
Dependent Claim
173 words
A phase modulator comprising: FM signal generating means for generating an FM signal obtained by frequency-modulating a reference frequency signal with a modulating frequency signal in order to variably set a modulation degree and a modulation frequency in phase modulation; first frequency conversion means for mixing an input signal having a predetermined carrier frequency with the FM signal from said FM signal generating means; first signal extracting means for extracting one of upper and lower sideband signals obtained from said first frequency conversion means as an intermediate frequency signal; delay means for delaying the intermediate frequency signal from said first signal extracting means by a predetermined time in order to variably set the modulation degree in said phase modulator; second frequency conversion means for mixing the intermediate frequency signal delayed by said delay means with the FM signal from said FM signal generating means; and second signal extracting means for extracting a frequency signal corresponding to the carrier frequency component of upper and lower sideband signals obtained from said second frequency conversion means.
Claim 11
Dependent Claim
46 words
A modulator according to claim 8, wherein said FM signal generating means comprises: a modulating signal generation circuit for generating a modulating frequency signal; and an FM modulation circuit for frequency-modulating the modulating frequency signal from said modulating signal generation circuit with the reference frequency signal.
Claim 12
Dependent Claim
39 words
A modulator according to claim 9, wherein said FM modulation circuit comprises a voltage-controlled oscillator in which an oscillation frequency is changed centered on a predetermined reference frequency in accordance with an amplitude value of the modulating frequency signal.
Claim 13
Dependent Claim
31 words
A modulator according to claim 10, wherein said voltage-controlled oscillator includes a current control multivibrator whose oscillation frequency is changed in accordance with the amplitude value of the modulating frequency signal.
Claim 14
Dependent Claim
29 words
A modulator according to claim 8, wherein said first signal extracting means includes a low-pass filter for filtering a lower sideband signal of the upper and lower sideband signals.
Claim 15
Dependent Claim
22 words
A modulator according to claim 8, wherein said delay means includes a signal line having a length corresponding to the predetermined time.
Claim 16
Dependent Claim
21 words
A modulator according to claim 8, wherein said second signal extracting means includes a bandpass filter having predetermined pass band characteristics.
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) | 2000-01-28 | 2000-07-29 | 2001-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-28 | 2004-07-29 | 2005-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-28 | 2008-07-29 | 2009-01-28 | $7700.00 | Window Closed / Lapsed |