US4086545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase locked loop type transmitter receiver
Assignee: Cybernet Electronics Corp
•
Filing: 1977-03-14
•
Granted: 1978-04-25
•
Expires: 1997-03-14
Abstract
Abstract A phase locked loop type transmitter-receiver having a phase locked loop type synthesizer including a circuit in which a programmable counter, a phase discriminator, a low-pass filter, a voltage-controlled oscillator and a mixer are connected in a closed loop; wherein the mixer is connected to a reference oscillator connected to the phase discriminator through a fixed frequency divider, the mixer being adapted to mix frequencies fed from the reference oscillator and the voltage-controlled oscillator thereby synthesizing sum and difference signals thereof, the difference signal being fed to the programmable counter and the sum signal being fed to a transmitting-side mixer and a receiving-side mixer.
Inventors
- 👤 Toshihiko Teshirogi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:46
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/54; H03; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/183; H03L7/185
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
A phase locked loop type transmitter-receiver comprising: a reference oscillator for generating a first frequency signal; a fixed frequency divider connected to the reference oscillator; a phase discriminator connected to the fixed frequency divider; a low-pass filter connected to the phase discriminator; a voltage controlled oscillator connected to the low-pass filter for generating a second frequency signal; mixer means connected to the reference oscillator and to the voltage controlled oscillator for mixing the first and second frequencies to synthesize sum and difference signals therof; a programmable counter connected between the mixer means and the phase discriminator for dividing the sum signal synthesized by the mixer means; a transmitting side mixer connected to the mixer means to receive the sum signal synthesized by the mixer means for synthesizing a carrier wave for transmission; and a receiving side mixer connected to the mixer means to receive the sum signal synthesized by the mixer means for synthesizing a local oscillation frequency for reception.
Claim 2
Dependent Claim
160 words
A phase locked loop type transmitter-receiver comprising: a reference oscillator for generating a first frequency signal; a fixed frequency divider connected to the reference oscillator; a phase discriminator connected to the fixed frequency divider; a low-pass filter connected to the phase discriminator; a voltage controlled oscillator connected to the low-pass filter for generating a second frequency signal; mixer means connected to the reference oscillator and to the voltage controlled oscillator for mixing the first and second frequencies to synthesize sum and difference signals therof; a programmable counter connected between the mixer means and the phase discriminator for dividing the sum signal synthesized by the mixer means; a transmitting side mixer connected to the mixer means to receive the sum signal synthesized by the mixer means for synthesizing a carrier wave for transmission; and a receiving side mixer connected to the mixer means to receive the sum signal synthesized by the mixer means for synthesizing a local oscillation frequency for reception.
Claim 3
Dependent Claim
27 words
The phase locked loop type transmitter-receiver recited in claim 1 including: frequency multiplier connected between the reference oscillator and the mixer for multiplying the first frequency signal.
References Cited (Backward Citations)
US3588731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |