Patent US3745474A successfully refreshed from Google Patents.
US3745474A
Expired / Lapsed
US
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High speed logarithmic video amplifier
Assignee: United States Department of the Navy
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Filing: 1971-12-20
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Granted: 1973-07-10
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Expires: 1991-12-20
Abstract
Abstract A multistage, parallel summation, logarithmic video amplifier, capable of handling very short pulses in which linear amplifier(s) are used in each stage as delay device(s) such that all of the stages simultaneously provide their output in response to each input pulse.
Inventors
- 👤 R Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:19
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
244 words
An amplifier providing an output signal which is a logarithmic function of the input signal, comprising: a plurality of amplification stages wherein each stage, except the last stage, includes means for delaying that stage output such that the outputs of all the stages occur simultaneously, including a first stage having first phasing means coupled to said input signal for phasing the first stage as a function of the input signal intensity, first amplifying means coupled to said first phasing means for delaying the input signal processed by said first phasing means, and second amplifying means coupled to the output of said first amplifying means for providing an output which is a logarithmic function of the delayed input signal processed by said first phasing means, a second stage including a second phasing means coupled to an output of the first phasing means for phasing the second stage as a function of said first phasing means output intensity, third amplifying means coupled to said second phasing means for delaying said first phasing means output processed by said second phasing means, and fourth amplifying means coupled to the output of said third amplifying means for providing an output which is a logarithmic function of the delayed said first phasing means output processed by said second phasing means; and combining means coupled to the outputs of the plurality of stages for summing their outputs and providing a system output which is a logarithmic function of said input signal.
Claim 2
Dependent Claim
244 words
An amplifier providing an output signal which is a logarithmic function of the input signal, comprising: a plurality of amplification stages wherein each stage, except the last stage, includes means for delaying that stage output such that the outputs of all the stages occur simultaneously, including a first stage having first phasing means coupled to said input signal for phasing the first stage as a function of the input signal intensity, first amplifying means coupled to said first phasing means for delaying the input signal processed by said first phasing means, and second amplifying means coupled to the output of said first amplifying means for providing an output which is a logarithmic function of the delayed input signal processed by said first phasing means, a second stage including a second phasing means coupled to an output of the first phasing means for phasing the second stage as a function of said first phasing means output intensity, third amplifying means coupled to said second phasing means for delaying said first phasing means output processed by said second phasing means, and fourth amplifying means coupled to the output of said third amplifying means for providing an output which is a logarithmic function of the delayed said first phasing means output processed by said second phasing means; and combining means coupled to the outputs of the plurality of stages for summing their outputs and providing a system output which is a logarithmic function of said input 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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |