US3700920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency independent peak detector
Assignee: Bendix Corp
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Filing: 1971-05-06
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Granted: 1972-10-24
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Expires: 1991-05-06
Abstract
Abstract A frequency independent peak detector includes a circuit for differentiating the signal whose peak is to be detected, with the output of the differentiating circuit being applied to a high gain amplifier whose output is either in a high or low state, depending on what state the differentiated signal is in. The differentiating circuit is comprised of a capacitor and a diode operating as a resistance which varies inversely proportional to frequency by virtue of the fact it is biased to operate in the exponential region of its volt-ampere characteristic. This compensates for the change in capacitor reactance as the input signal frequency varies to maintain the frequency-RC time constant product of the circuit relatively constant.
Inventors
- 👤 Francis R Eyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:45
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/153; H03K5/1532; B; B60; B60T; B60T8/00; B60T8/17; B60T8/172; Y; Y10; Y10S; Y10S303/00; Y10S303/05
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
A frequency independent peak detector comprising: a differential amplifier having a first and second input terminal; a peak detector input terminal; a capacitor connected between said peak detector input terminal and said first input terminal; a first diode having an anode electrode connected to said first input terminal, and a cathode electrode; a second diode having a cathode electrode connected to said first input terminal, and an anode electrode; a d.c. voltage source; a resistance ladder connected across said d.c. voltage source; the cathode electrode of said first diode and the anode electrode of said second diode being connected together and to a first point within said resistance ladder; and, a third diode connected between said second input terminal and a second point within said resistance ladder.
Claim 2
Dependent Claim
127 words
A frequency independent peak detector comprising: a differential amplifier having a first and second input terminal; a peak detector input terminal; a capacitor connected between said peak detector input terminal and said first input terminal; a first diode having an anode electrode connected to said first input terminal, and a cathode electrode; a second diode having a cathode electrode connected to said first input terminal, and an anode electrode; a d.c. voltage source; a resistance ladder connected across said d.c. voltage source; the cathode electrode of said first diode and the anode electrode of said second diode being connected together and to a first point within said resistance ladder; and, a third diode connected between said second input terminal and a second point within said resistance ladder.
Claim 3
Dependent Claim
36 words
A frequency independent peak detector as recited in claim 1 wherein the resistance between said first and second resistance ladder interior points corresponds to a d.c. offset voltage applied to said first and second input terminals.
Claim 4
Dependent Claim
29 words
A frequency independent peak detector as recited in claim 2 with additionally a relatively high resistance resistor connected between the output of said amplifier and said second interior point.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |