Patent US3643170A successfully refreshed from Google Patents.
US3643170A
Expired / Lapsed
US
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Envelope delay compensation circuit
Assignee: Harris Corp
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Filing: 1969-12-24
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Granted: 1972-02-15
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Expires: 1989-12-24
Abstract
Abstract A network to compensate for group delay having a pair of circuit paths with a variable delay network in one path and a fixed delay network in the other path. The input information is coupled to both circuit paths and the output of the two paths is combined in a differential amplifier to produce a vector addition of the signals from the separate paths. An isolation network is provided in the variable delay circuit path and a resonant circuit is provided to have an adjustable Q and adjustable frequency of resonance and is also located in the same path. Means are provided to adjust the relative amplitudes of the two signals so that the resulting output of the differential amplifier will have a substantially constant amplitude regardless of the output frequency or phase.
Inventors
- 👤 Leon J Stanger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:44
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
A network to compensate for group delay comprising: means for dividing a signal into at least two current paths, means for delaying the signal in at least one of the two current paths, means for adjusting the amplitude of the signal in one of the two current paths relative to the amplitude of the signal in the other path, means for algebraically adding the signals in the two current paths, and a variable resonant circuit being provided in one of said two current paths and means being provided thErein to selectably adjust the circuit Q.
Claim 2
Dependent Claim
95 words
A network to compensate for group delay comprising: means for dividing a signal into at least two current paths, means for delaying the signal in at least one of the two current paths, means for adjusting the amplitude of the signal in one of the two current paths relative to the amplitude of the signal in the other path, means for algebraically adding the signals in the two current paths, and a variable resonant circuit being provided in one of said two current paths and means being provided thErein to selectably adjust the circuit Q.
Claim 3
Dependent Claim
90 words
A network to compensate for group delay comprising: means for causing a signal to traverse first and second current paths, a fixed delay line in said first current path and a variable delay line in said second current path, means for adjusting the amplitude of the signal in one of said current paths, a tuned circuit in one of said current paths and having an adjustable Q, and differential amplifier means combining the outputs of said first and second current paths to provide a constant amplitude output as frequency varies.
Claim 4
Dependent Claim
90 words
A network to compensate for group delay comprising: means for causing a signal to traverse first and second current paths, a fixed delay line in said first current path and a variable delay line in said second current path, means for adjusting the amplitude of the signal in one of said current paths, a tuned circuit in one of said current paths and having an adjustable Q, and differential amplifier means combining the outputs of said first and second current paths to provide a constant amplitude output as frequency varies.
Claim 5
Dependent Claim
43 words
A network to compensate for group delay in accordance with claim 2 wherein an isolation transistor is provided in circuit between said fixed and said variable delay lines, whereby changes in said variable delay lines are not reflected to said fixed delay lines.
Claim 6
Dependent Claim
31 words
A network to compensate for group delay in accordance with claim 2 wherein a transistor having a low output impedance is coupled between said variable delay line and said tuned circuit.
Claim 7
Dependent Claim
48 words
A network to compensate for group delay in accordance with claim 2 wherein said variable delay line includes a series of voltage dependent capacitive diodes to alter the delay thereof in dependence on the voltage imposed on the capacitive diodes in the associated one of said current paths.
Claim 8
Dependent Claim
26 words
A network to compensate for group delay in accordance with claim 2 wherein means are provided to adjust the frequency of resonance of said tuned circuit.
Claim 9
Dependent Claim
93 words
A network to compensate for group delay comprising: means for dividing a signal into first and second current paths, a fixed delay line in said first current path and a variable delay line in said second current path, means for adjusting the amplitude of the signal in one of said current paths, a tuned circuit in one of said current paths and having means for adjusting the frequency of resonance, and differential amplifier means combining the outputs of said first and second current paths to provide a constant amplitude output as frequency varies.
Claim 10
Dependent Claim
93 words
A network to compensate for group delay comprising: means for dividing a signal into first and second current paths, a fixed delay line in said first current path and a variable delay line in said second current path, means for adjusting the amplitude of the signal in one of said current paths, a tuned circuit in one of said current paths and having means for adjusting the frequency of resonance, and differential amplifier means combining the outputs of said first and second current paths to provide a constant amplitude output as frequency varies.
Claim 11
Dependent Claim
111 words
A network to compensate for group delay comprising: means for dividing a signal into at least two current paths, means in one of the current paths for producing a group delay and generating a first output signal which varies in amplitude and phase as the frequency varies from zero to infinity, means for producing a fixed delay in the other current path to generate a second output signal having characteristics such that when it is vectorially combined with said first output signal a resultant signal is developed which is fixed in amplitude as phase and frequency are varied, and means for vectorially adding the output signals from the two current paths.
Claim 12
Dependent Claim
111 words
A network to compensate for group delay comprising: means for dividing a signal into at least two current paths, means in one of the current paths for producing a group delay and generating a first output signal which varies in amplitude and phase as the frequency varies from zero to infinity, means for producing a fixed delay in the other current path to generate a second output signal having characteristics such that when it is vectorially combined with said first output signal a resultant signal is developed which is fixed in amplitude as phase and frequency are varied, and means for vectorially adding the output signals from the two current paths.
Claim 13
Dependent Claim
48 words
A network in accordance with claim 8 wherein a variable delay line is included in one of the current paths to assist in matching the characteristics of the signals in the two paths so that when they are added together, the resultant signal will have a constant amplitude.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |