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US3882405A
Expired / Lapsed
US
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Analog signal comparator circuit
Assignee: NEC Corp
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Filing: 1973-04-03
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Granted: 1975-05-06
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Expires: 1993-04-03
Abstract
Abstract An analog comparator circuit for comparing the levels of two analog signals and providing an output which depends upon the difference in the levels of the two signals. The comparison is made within the minimum resolution capability of the comparator. A clamping means is provided to limit the minimum analog level which will cause the comparator to switch from one output to another. The limit is set independently on the minimum resolution of the comparator.
Inventors
- 👤 Mutsunari Tajima
- 👤 Isao Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:47
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/10; H; H03; H03K; H03K5/00; H03K5/22; H03K5/24; H04; H04B; H04B3/00; H04B3/02; H04B3/20; H04M; H04M9/00; H04M9/08; H04M9/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
An analog comparator circuit of the type which includes first means for rectifying and smoothing a first analog signal to provide a first output signal at its output, second means for rectifying and smoothing a second analog signal to provide a second output signal at its output, and a comparator means connected to receive said first and second output signals, having a minimum resolution level, and adapted to provide an output voltage which varies depending upon the difference in the absolute value of said first and second output signals, wherein the improvement comprises means connected to the output of said second means for clamping the absolute value of said second output signal to a minimum value greater than said minimum resolution level of said comparator means when said absolute value is smaller than said minimum value.
Claim 2
Dependent Claim
136 words
An analog comparator circuit of the type which includes first means for rectifying and smoothing a first analog signal to provide a first output signal at its output, second means for rectifying and smoothing a second analog signal to provide a second output signal at its output, and a comparator means connected to receive said first and second output signals, having a minimum resolution level, and adapted to provide an output voltage which varies depending upon the difference in the absolute value of said first and second output signals, wherein the improvement comprises means connected to the output of said second means for clamping the absolute value of said second output signal to a minimum value greater than said minimum resolution level of said comparator means when said absolute value is smaller than said minimum value.
Claim 3
Dependent Claim
79 words
An analog comparator circuit as claimed in claim 1 wherein said clamping means comprises, a battery having a d.c. level above the minimum resolution of said comparator means, and a rectifier, said battery and rectifier being connected in series with each other and said series connection being connected to the output of said second means, the polarity of said battery and said rectifier being such as to maintain a voltage minimum equal to said battery voltage at said output.
Claim 4
Dependent Claim
55 words
An analog comparator circuit as claimed in claim 1 further comprising second clamping means connected to the output of said first means for clamping the absolute value of said first output signal to a minimum value greater than the minimum resolution of said comparator means when said absolute value is smaller than said minimum value.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |