US4639688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-band phase locked loop amplifier apparatus
Assignee: United States Department of the Air Force
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Filing: 1985-04-18
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Granted: 1987-01-27
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Expires: 2005-04-18
Abstract
Abstract A wide-band amplifier apparatus utilizing a low frequency and a high frequency phase lock loop to achieve low phase delay at the loop bandwidth. The bandwidth products of the low and high frequency loop paths are combined and applied to the voltage controlled oscillator to minimize phase delay and to achieve a more stable loop.
Inventors
- 👤 Francis W. Hopwood
- 👤 Stephen P. Caldwell
- 👤 Martin J. Decker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:27
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; H03L7/08; H03L7/081
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
345 words
A wide-band phase locked loop amplifier apparatus comprising in combination: a first summing means to receive an RF reference signal, said first summing means having a first and second output port, a first mixer means having a first input port to receive said RF reference signal from said second output port of said first summing means, said first mixer means having a second input port and a first and second output port, said first output port connected to ground, an amplifier means connected to said second output port of said first mixer means to receive the first composite signal therefrom at its noninverting input terminal, said amplifier means having an inverting terminal and an output terminal, a filter means connected to said output terminal of said amplifier means to receive the output signal therefrom, said filter means filtering said output signal, a second mixer means receiving said output signal from said filter means at its first input port, said second mixer means having a second input port, a third input port and an output port, said second input port of said second mixer means receiving said RF reference signal from said first output port of said first summing means, said second mixer means providing a second composite signal at said output port, a voltage controlled oscillator means receiving said second composite signal at its tuning port, said voltage controlled oscillator means providing an RF signal at its output port, and, a second summing means receiving said RF signal from said voltage controlled oscillator at a first input port, said second summing means having a first and second output port, said second summing means applying said RF signal through said second output port to said third input port of said second mixer means such that said second mixer means combines all received input signals to form said second composite signal, said second summing means applying said RF signal through said third output port to said second input port of said first mixer means such that the received signals are combined to form said first composite signal.
Claim 2
Dependent Claim
345 words
A wide-band phase locked loop amplifier apparatus comprising in combination: a first summing means to receive an RF reference signal, said first summing means having a first and second output port, a first mixer means having a first input port to receive said RF reference signal from said second output port of said first summing means, said first mixer means having a second input port and a first and second output port, said first output port connected to ground, an amplifier means connected to said second output port of said first mixer means to receive the first composite signal therefrom at its noninverting input terminal, said amplifier means having an inverting terminal and an output terminal, a filter means connected to said output terminal of said amplifier means to receive the output signal therefrom, said filter means filtering said output signal, a second mixer means receiving said output signal from said filter means at its first input port, said second mixer means having a second input port, a third input port and an output port, said second input port of said second mixer means receiving said RF reference signal from said first output port of said first summing means, said second mixer means providing a second composite signal at said output port, a voltage controlled oscillator means receiving said second composite signal at its tuning port, said voltage controlled oscillator means providing an RF signal at its output port, and, a second summing means receiving said RF signal from said voltage controlled oscillator at a first input port, said second summing means having a first and second output port, said second summing means applying said RF signal through said second output port to said third input port of said second mixer means such that said second mixer means combines all received input signals to form said second composite signal, said second summing means applying said RF signal through said third output port to said second input port of said first mixer means such that the received signals are combined to form said first composite signal.
Claim 3
Dependent Claim
34 words
A wide-band phase locked loop amplifier apparatus as described in claim 1 wherein said amplifier means comprises an operational amplifier with a feedback means connected between its output terminal and its inverting input terminal.
Claim 4
Dependent Claim
24 words
A wide-band phase locked loop amplifier apparatus as described in claim 2 wherein said feedback means comprises a resistor/capacitor network to form an integrator.
Claim 5
Dependent Claim
22 words
A wide-band phase locked loop amplifier apparatus as described in claim 3 wherein said filter means comprises a low pass filter network.
Claim 6
Dependent Claim
22 words
A wide-band phase locked loop amplifier apparatus as described in claim 4 wherein said low pass filter network comprises a resistor/capacitor filter.
Claim 7
Dependent Claim
36 words
A wide-band phase locked loop amplifier apparatus as described in claim 5 wherein the first circuit loop defined by said first summing means and said second mixer means forms a high frequency path with unity gain.
Claim 8
Dependent Claim
48 words
A wide-band phase locked loop amplifier apparatus as described in claim 5 wherein said second circuit loop defined by said first mixer means, said amplifier means, said filter means, said second mixer means, said voltage controlled oscillator means and said second summing means forms a low frequency path.
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) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |