US4097805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-synthesizer type transceiver
Assignee: Torio KK
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Filing: 1976-06-14
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Granted: 1978-06-27
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Expires: 1996-06-14
Abstract
Abstract This invention provides a frequency-synthesizer type transceiver having a voltage-controlled oscillator and means for comparing the phases of mixed frequency, whereby the voltage-controlled oscillator is regulated by signals resulting from the phase comparison to generate a controlled frequency serving as the local oscillator frequency for transmitting and receiving. The frequency-synthesizer type transceiver further includes a means for selectively switching from the one carrier frequency to the other to differentiate the transmitting and receiving frequencies.
Inventors
- 👤 Motoyuki Fujii
- 👤 Koji Yokota
- 👤 Hajime Yashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:35
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
A phase-locked loop circuit for a frequency-synthesizer type transceiver comprising: (a) an oscillator for producing a reference frequency, (b) a voltage controlled oscillator for producing an output frequency, (c) a first oscillator circuit for producing a designated frequency, (d) first combining means for combining the output frequency with the designated frequency and forming a first mixed frequency, (e) a second oscillator circuit for producing a carrier frequency, (f) second combining means for combining the carrier frequency with the first mixed frequency and forming a second mixed frequency, (g) comparing means for comparing the phases of the second mixed frequency and the reference frequency and producing a comparison signal, and (h) the voltage-controlled oscillator being connected to the comparing means for receiving the comparison signal, whereby said signal regulates the output frequency produced by the voltage-controlled oscillator.
Claim 2
Dependent Claim
136 words
A phase-locked loop circuit for a frequency-synthesizer type transceiver comprising: (a) an oscillator for producing a reference frequency, (b) a voltage controlled oscillator for producing an output frequency, (c) a first oscillator circuit for producing a designated frequency, (d) first combining means for combining the output frequency with the designated frequency and forming a first mixed frequency, (e) a second oscillator circuit for producing a carrier frequency, (f) second combining means for combining the carrier frequency with the first mixed frequency and forming a second mixed frequency, (g) comparing means for comparing the phases of the second mixed frequency and the reference frequency and producing a comparison signal, and (h) the voltage-controlled oscillator being connected to the comparing means for receiving the comparison signal, whereby said signal regulates the output frequency produced by the voltage-controlled oscillator.
Claim 3
Dependent Claim
48 words
The circuit in claim 1, further comprising a carrier oscillating circuit connected to the second oscillating circuit, the carrier oscillating circuit including a continuous wave frequency oscillator and an electric switching means for selectively switching from one carrier frequency to another to differentiate the transmitting and receiving frequencies.
References Cited (Backward Citations)
US3944925A
Cited
US3983484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |