US3810046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave source
Assignee: California Microwave Inc
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Filing: 1973-02-23
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Granted: 1974-05-07
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Expires: 1993-02-23
Abstract
Abstract A microwave source including a dual bandwidth phase lock loop and a circuit for developing a modulation cancelling signal for insertion into the loop to cancel any error signal modulation components. In the preferred embodiment the same modulating signal used to modulate the oscillator is shifted in phase by 90* and added to the output of the phase detector. Since the cancelling signal is then 180* out-of-phase with the error signal modulation component, complete cancellation is achieved leaving only the DC error signal for input to the adaptive control network which completes the loop.
Inventors
- 👤 D Lance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:55
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/09; H03C3/0908; H03C3/0991; H03C3/0941; H03C3/0958; H03C3/0966; H03C2200/00; H03C2200/0037; H03C2200/005; H03C2200/0054
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
204 words
A microwave source, comprising: microwave oscillator means responsive to a control signal and a modulating signal and operative to develop a modulated output signal; reference source means for developing a fixed frequency reference signal; phase detecting means responsive to said output signal and said reference signal and operative to develop an error signal commensurate with any difference in phase between said reference signal and said output signal, said error signal including modulation components corresponding to said modulating signal; a dual bandwidth signal translating means responsive to said error signal and operative to develop said control signal, said translating means completing a phase lock loop for controlling the frequency of said oscillator means, said translating circuit causing said loop to have a first bandwidth when the magnitude of said error signal is less than a predetermined threshold value and a second bandwidth when the magnitude of said error signal is greater than said threshold value; and modulation cancelling means responsive to said modulating signal and operative to develop a modulation cancelling signal which is 180* out-of-phase with said modulating component, said cancelling signal being added to said error signal at the input to said translating means for removing said modulation component from said error signal.
Claim 2
Dependent Claim
204 words
A microwave source, comprising: microwave oscillator means responsive to a control signal and a modulating signal and operative to develop a modulated output signal; reference source means for developing a fixed frequency reference signal; phase detecting means responsive to said output signal and said reference signal and operative to develop an error signal commensurate with any difference in phase between said reference signal and said output signal, said error signal including modulation components corresponding to said modulating signal; a dual bandwidth signal translating means responsive to said error signal and operative to develop said control signal, said translating means completing a phase lock loop for controlling the frequency of said oscillator means, said translating circuit causing said loop to have a first bandwidth when the magnitude of said error signal is less than a predetermined threshold value and a second bandwidth when the magnitude of said error signal is greater than said threshold value; and modulation cancelling means responsive to said modulating signal and operative to develop a modulation cancelling signal which is 180* out-of-phase with said modulating component, said cancelling signal being added to said error signal at the input to said translating means for removing said modulation component from said error signal.
Claim 3
Dependent Claim
30 words
A microwave source as recited in claim 1 wherein said modulation cancelling means includes phase shifting means for shifting the phase of said modulating signal to develop said cancelling signal.
Claim 4
Dependent Claim
53 words
A microwave source as recited in claim 1 wherein said signal translating means includes, an operational amplifier for receiving said error signal and said cancelling signal and developing an amplified signal commensurate with the sum thereof, and an adaptive control network responsive to said amplified signal and operative to develop said control signal.
Claim 5
Dependent Claim
129 words
A microwave source as recited in claim 3 wherein said adaptive control network includes, filter means coupled between the output of said operational amplifier and the control signal receiving input of said microwave oscillator means, and a voltage follower means having an input terminal coupled to the output of said operational amplifier and an output coupled to the control input of said microwave oscillator means, said voltage follower means being responsive to amplified error signals exceeding a predetermined threshold and operative to develop control signals commensurate therewith, whereby said phase lock loop has a first bandwidth determined by said filter means when the amplified error signal is less than said threshold and has a second bandwidth independent of said filter means when the amplified error signal exceeds said threshold.
Claim 6
Dependent Claim
39 words
A microwave source as recited in claim 4 wherein said filter means includes an out-of-band filter and a low-pass filter connected in series between the output of said operational amplifier and the control input of said microwave oscillator means.
Claim 7
Dependent Claim
106 words
In a microwave source including a modulatable voltage controlled microwave oscillator for developing a modulated output signal and a dual bandwidth phase lock loop for controlling said oscillator, the loop including a phase detector for developing an error signal and a signal translating circuit responsive to the magnitude of the error signal and operative to change the bandwidth of said loop commensurate therewith and to develop an oscillator control signal, the improvement comprising, modulation cancelling means for developing a modulation cancelling signal for insertion into said loop between said phase detector and said signal translating circuit to cancel any modulation components appearing in said error signal.
Claim 8
Dependent Claim
106 words
In a microwave source including a modulatable voltage controlled microwave oscillator for developing a modulated output signal and a dual bandwidth phase lock loop for controlling said oscillator, the loop including a phase detector for developing an error signal and a signal translating circuit responsive to the magnitude of the error signal and operative to change the bandwidth of said loop commensurate therewith and to develop an oscillator control signal, the improvement comprising, modulation cancelling means for developing a modulation cancelling signal for insertion into said loop between said phase detector and said signal translating circuit to cancel any modulation components appearing in said error signal.
Claim 9
Dependent Claim
74 words
In a microwave source as recited in claim 6 wherein said modulation cancelling means includes a phase shifting means having input means for receiving the modulation signal applied to said microwave oscillator and output means coupled to the input of said signal translating circuit, said phase shifting means being operative to shift the phase of said modulating signal so that said cancelling signal is 180* out-of-phase with the modulation component of said error signal.
Claim 10
Dependent Claim
188 words
A microwave source, comprising: a voltage controlled microwave oscillator having a first input terminal for receiving a control signal, a second input terminal for receiving a modulating signal and an output terminal at which a modulated microwave signal is generated; modulating means for developing said modulating signal for input to said second input terminal; a phase lock loop including a phase detector for comparing said modulated micorwave signal to a reference signal and developing an error signal commensurate with the difference therebetween, said error signal including modulation components corresponding to said modulating signal, and adaptive means responsive to said error signal and operative to develop a control signal for input to said first input terminal, said adaptive network being further operative to automatically change the loop bandwidth in response to the magnitude of said error signal to increase the control capability of said loop; modulation cancelling means responsive to said modulating signal and operative to develop a modulation cancelling signal; and means for adding said error signal and said modulating cancelling signal to cancel said modulation component before said error signal is introduced into said adaptive control network.
Claim 11
Dependent Claim
188 words
A microwave source, comprising: a voltage controlled microwave oscillator having a first input terminal for receiving a control signal, a second input terminal for receiving a modulating signal and an output terminal at which a modulated microwave signal is generated; modulating means for developing said modulating signal for input to said second input terminal; a phase lock loop including a phase detector for comparing said modulated micorwave signal to a reference signal and developing an error signal commensurate with the difference therebetween, said error signal including modulation components corresponding to said modulating signal, and adaptive means responsive to said error signal and operative to develop a control signal for input to said first input terminal, said adaptive network being further operative to automatically change the loop bandwidth in response to the magnitude of said error signal to increase the control capability of said loop; modulation cancelling means responsive to said modulating signal and operative to develop a modulation cancelling signal; and means for adding said error signal and said modulating cancelling signal to cancel said modulation component before said error signal is introduced into said adaptive control network.
Claim 12
Dependent Claim
36 words
A microwave source as recited in claim 8 wherein said modulation cancelling means includes a phase shifting means for shifting the phase of said modulating signal so that it is 180* out-of-phase with said modulation component.
Claim 13
Dependent Claim
84 words
A microwave source as recited in claim 8 wherein said adaptive control network includes filter means normally coupling said error signal to said first control input terminal and causing said control loop to have a relatively narrow loop bandwidth, and voltage follower means responsive to said error signal and operative to by-pass said filter means and develop a control signal at said first input terminal when said error signal exceeds a predetermined threshold thereby causing said loop to have a relatively wide loop bandwidth.
Claim 14
Dependent Claim
164 words
A microwave source, comprising: a voltage controlled microwave oscillator having a first input terminal for receiving a control signal, a second input terminal for receiving a modulating signal and an output terminal at which a modulated microwave signal is generated; means for developing said modulating signal for input to said second input terminal; a phase lock loop including a phase detector for comparing said modulated microwave signal to a reference signal and developing an error signal commensurate with any difference therebetween, an adaptive network responsive to said error signal and operative to develop a control signal for input to said first input terminal, said adapative network being further operative to automatically change the loop bandwidth in response to the magnitude of said error signal to increase the control capability of said loop; means responsive to said modulating signal and operative to develop a modulation cancelling signal; and reference signal generating means responsive to said modulation cancelling signal and operative to develop said reference signal.
Claim 15
Dependent Claim
164 words
A microwave source, comprising: a voltage controlled microwave oscillator having a first input terminal for receiving a control signal, a second input terminal for receiving a modulating signal and an output terminal at which a modulated microwave signal is generated; means for developing said modulating signal for input to said second input terminal; a phase lock loop including a phase detector for comparing said modulated microwave signal to a reference signal and developing an error signal commensurate with any difference therebetween, an adaptive network responsive to said error signal and operative to develop a control signal for input to said first input terminal, said adapative network being further operative to automatically change the loop bandwidth in response to the magnitude of said error signal to increase the control capability of said loop; means responsive to said modulating signal and operative to develop a modulation cancelling signal; and reference signal generating means responsive to said modulation cancelling signal and operative to develop said reference signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |