Patent US4308497A successfully refreshed from Google Patents.
US4308497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peak level detector
Assignee: Texscan Corp
•
Filing: 1979-06-18
•
Granted: 1981-12-29
•
Expires: 1999-06-18
Abstract
Abstract A peak detector circuit to be used in conjunction with an RF tunable volt meter is disclosed which charges a capacitor to a voltage level proportional to the amplitude of an incoming signal and then provides an accurate output signal, for driving a meter, the value of this signal being proportional to the voltage on the capacitor. The accuracy of the meter indicator reading is virtually identical for a particular amplitude regardless of whether the incoming signal is modulated or unmodulated (CW).
Inventors
- 👤 Gregg S. Rodgers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:27
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A peak detector circuit for linearly displaying the peak level of video-modulated, incoming RF signals as well as CW incoming RF signals from a signal source, said peak detector circuit comprising: a first peak detector circuit portion having an output and an input coupled to said signal source and including a first capacitor having a relatively small time constant; and a second peak detector circuit portion having an output and an input electrically connected to the output of said first peak detector circuit portion and including a holding capacitor permanently connected as part of said second peak detector circuit portion and being in a fixed position relative thereto, said second peak detector circuit portion further including means for rapidly charging said holding capacitor, said holding capacitor having a relatively large time constant.
Claim 2
Dependent Claim
132 words
A peak detector circuit for linearly displaying the peak level of video-modulated, incoming RF signals as well as CW incoming RF signals from a signal source, said peak detector circuit comprising: a first peak detector circuit portion having an output and an input coupled to said signal source and including a first capacitor having a relatively small time constant; and a second peak detector circuit portion having an output and an input electrically connected to the output of said first peak detector circuit portion and including a holding capacitor permanently connected as part of said second peak detector circuit portion and being in a fixed position relative thereto, said second peak detector circuit portion further including means for rapidly charging said holding capacitor, said holding capacitor having a relatively large time constant.
Claim 3
Dependent Claim
56 words
The peak detector circuit of claim 1 wherein said holding capacitor being suitably arranged in a feedback loop around a voltage comparator such that the charge on said holding capacitor increases in response to the output of said voltage comparator when said output is of a higher level than the existing charge on said holding capacitor.
Claim 4
Dependent Claim
36 words
The peak detector circuit of claim 2 wherein said second peak detector circuit portion is suitably arranged such that the charge on said holding capacitor is proportional to the peak level of said incoming RF signals.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |