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Patent US3818339A successfully refreshed from Google Patents.
US3818339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplitude comparison circuit
Assignee: Unisys Corp
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Filing: 1973-06-07
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Granted: 1974-06-18
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Expires: 1993-06-07
Abstract
Abstract An electronic circuit for measuring and comparing the amplitude of a plurality of out of phase signals. The amplitude measurements are accomplished by converting the signals to direct current voltages which equal the peak-to-peak amplitude of the signals. These direct current voltages are then compared electronically to a precision reference voltage which equals the peak-to-peak amplitude of a referenced signal. Direct measurements are then taken of the attenuation of the tested signals by reading the direct current voltages. Additional circuity is provided to make a pass-fail decision automatically where certain limits have been established for the attenuation of the signals to be tested.
Inventors
- 👤 D Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:51
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/22; H03K5/24; G; G01; G01R; G01R19/00; G01R19/10; G01R19/22; G01R27/00; G01R27/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
An electronic circuit for comparing the amplitudes of a plurality of test signals comprising: means for adjusting the impedance load of the electronic test circuit to equal that of the ultimate application of each of the test signals; means for precise reproduction of each of the test signals; means for converting said reproduction of each test signal into its direct current components; voltage correction means to compensate for any loss in said direct current components in said converting means; summing means for combining each of said direct current components into a voltage representing the peak-to-peak output signal for each test signal; first comparator means for comparing each of said voltages representing a test signal to a direct current potential representing a reference signal; second comparator means for comparing said voltages representing the test signals to one another; and indicator means responding to predetermined settings of said first comparator means and said second comparator means effective to indicate when the amplitudes of the test signals do not fall within predetermined specifications.
Claim 2
Dependent Claim
170 words
An electronic circuit for comparing the amplitudes of a plurality of test signals comprising: means for adjusting the impedance load of the electronic test circuit to equal that of the ultimate application of each of the test signals; means for precise reproduction of each of the test signals; means for converting said reproduction of each test signal into its direct current components; voltage correction means to compensate for any loss in said direct current components in said converting means; summing means for combining each of said direct current components into a voltage representing the peak-to-peak output signal for each test signal; first comparator means for comparing each of said voltages representing a test signal to a direct current potential representing a reference signal; second comparator means for comparing said voltages representing the test signals to one another; and indicator means responding to predetermined settings of said first comparator means and said second comparator means effective to indicate when the amplitudes of the test signals do not fall within predetermined specifications.
Claim 3
Dependent Claim
26 words
An electronic test means as defined in claim 1 wherein said means for converting said reproduction of each of the test signals comprises a rectifier-filter circuit.
Claim 4
Dependent Claim
65 words
An electronic test means as defined in claim 1 wherein said voltage correction means comprises the combination of an adjustable voltage source to provide a compensating voltage; and a differential amplifier to combine said compensating voltage with said direct current component of said delay line output signals. 4. An electronic test means as defined in claim 1 wherein said summing means comprises a differential amplifier.
Claim 5
Dependent Claim
41 words
An electronic test means as defined in claim 1 wherein said first comparator means comprises: an adjustable voltage source; and a differential amplifier to compare the voltage from said adjustable source to said voltage representing the amplitude of a test signal.
Claim 6
Dependent Claim
76 words
An electronic test means as defined in claim 1 wherein said second comparator means comprises: a differential amplifier for each pair of said voltages representing the amplitude of test signals to produce a difference voltage representing the difference between said pair of voltages; an adjustable source of positive voltage; an adjustable source of negative voltage; means for comparing said differential voltage with said positive voltage; and means for comparing said differential voltage with said negative voltage.
References Cited (Backward Citations)
US1966047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |