US4392113A
Expired / Lapsed
US
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Phase-locked loop including non-linear phase detector of the sample and hold type
Assignee: Raytheon Co
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Filing: 1981-02-12
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Granted: 1983-07-05
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Expires: 2001-02-12
Abstract
Abstract A non-linear phase detector is disclosed which compensates for gains occuring during tuning a frequency generator of a known phase locked loop circuit which incorporates a Varactor tuned resonant circuit as a VCO. The phase detector is of the sample and hold type and incorporates a Varactor rather than a hold capacator to compensate for non-linear gains which occur when tuning the frequency generator across its band spread. Additionally, bias compensation is provided for the resonant circuit Varactor to offset its contact potential.
Inventors
- 👤 Charles R. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:11
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/085; H03L7/091; H03L7/16; H03L7/18; H03L7/183; H03L2207/00; H03L2207/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
151 words
Apparatus for automatically compensating for non-linear variations in the gain characteristics of a multi-channel, single loop synthesized frequency generator which occur during tuning from a first frequency channel having a frequency, f 1 , to a second frequency channel having a frequency, f 2 , comprising: a voltage controlled oscillator (VCO) incorporating a Varactor tuned resonant circuit and having an input and an output; a sample-hold phase detector circuit having an output connected to the input of said VCO; a feed back loop conductor interconnecting the output of said VCO to said phase detector to form a phase locked loop frequency generator, and gain compensation means interconnected in said phase detector and responsive to the first channel frequency, f 1 , and the second channel frequency, f 2 , for reducing non-linear variations in loop gain to 0 db when tuning the frequency generator from f 1 to f 2 .
Claim 2
Dependent Claim
151 words
Apparatus for automatically compensating for non-linear variations in the gain characteristics of a multi-channel, single loop synthesized frequency generator which occur during tuning from a first frequency channel having a frequency, f 1 , to a second frequency channel having a frequency, f 2 , comprising: a voltage controlled oscillator (VCO) incorporating a Varactor tuned resonant circuit and having an input and an output; a sample-hold phase detector circuit having an output connected to the input of said VCO; a feed back loop conductor interconnecting the output of said VCO to said phase detector to form a phase locked loop frequency generator, and gain compensation means interconnected in said phase detector and responsive to the first channel frequency, f 1 , and the second channel frequency, f 2 , for reducing non-linear variations in loop gain to 0 db when tuning the frequency generator from f 1 to f 2 .
Claim 3
Dependent Claim
45 words
The apparatus of claim 1, wherein said gain compensation means is a Varactor having characteristics selected to compensate for the sum of individual loop gains occuring within said VCO, said phase detector and said feedback loop during tuning from f 1 to f 2 .
Claim 4
Dependent Claim
31 words
The apparatus of claim 1 further including bias means for providing a bias voltage signal having a magnitude sufficient to overcome the inherent contact potential of said resonant circuit tuning Varactor.
Claim 5
Dependent Claim
42 words
The apparatus of claim 3 wherein said bias means is a transistor interconnected into the tuning loop, said transistor biased to interact with the tuning loop by generating a potential signal equal and opposite to said resonant circuit tuning Varactor contact potential.
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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |