US4074149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Peak detecting with constant fractional offset
Assignee: US Philips Corp
•
Filing: 1974-11-08
•
Granted: 1978-02-14
•
Expires: 1994-11-08
Abstract
Abstract A peak detector for electrical signal peaks including a capacitor which is charged, via a rectifying element, to a voltage corresponding to the peak value. At the end of the peak a discharging element connected parallel to the capacitor is activated for a predetermined period of time, with the result that the capacitor is discharged over a fixed fraction of its peak voltage. At the end of the predetermined period of time, the discharging element is reactivated, with the result that a substantially constant voltage remains as a reference level.
Inventors
- 👤 Geert J. Naaijer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:13
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/04; G11; G11B; G11B20/00; G11B20/10; G11B20/10009
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
208 words
A peak detector for detecting peaks of various amplitudes comprising: difference determining means having first and second inputs and an output; means for applying an input signal, having signal peaks at successive times and of arbitrary amplitude, to the first input of said difference determining means; analog storage means, comprising a capacitor having one terminal connected to said second input of said difference determining means for storing an analog reference level derived from the most recent signal peak of said input signal; charging means connected to the output of said difference determining means and responsive to a latter signal peak having an amplitude greater than the reference level of said analog storage means and operative for charging said capacitor; timing means having an input connected to the output of said difference determining means, and an output, said timing means being responsive to the trailing edge of a signal peak received on its input for generating a signal of predetermined duration of its output; and discharging means having a control input connected to the output of said timing means for partially discharging said capacitor by a predetermined fraction upon termination of an input signal peak for determining said analog reference as a fraction of the most recent signal peak.
Claim 2
Dependent Claim
208 words
A peak detector for detecting peaks of various amplitudes comprising: difference determining means having first and second inputs and an output; means for applying an input signal, having signal peaks at successive times and of arbitrary amplitude, to the first input of said difference determining means; analog storage means, comprising a capacitor having one terminal connected to said second input of said difference determining means for storing an analog reference level derived from the most recent signal peak of said input signal; charging means connected to the output of said difference determining means and responsive to a latter signal peak having an amplitude greater than the reference level of said analog storage means and operative for charging said capacitor; timing means having an input connected to the output of said difference determining means, and an output, said timing means being responsive to the trailing edge of a signal peak received on its input for generating a signal of predetermined duration of its output; and discharging means having a control input connected to the output of said timing means for partially discharging said capacitor by a predetermined fraction upon termination of an input signal peak for determining said analog reference as a fraction of the most recent signal peak.
Claim 3
Dependent Claim
25 words
A peak detector as defined in claim 1, wherein said charging means comprises a transistor having a current path series to said analog storage means.
Claim 4
Dependent Claim
22 words
A peak detector as defined in claim 1, wherein said discharging means comprises a field-effect transistor and a resistor connected in series.
Claim 5
Dependent Claim
17 words
A peak detector as defined in claim 1, wherein said difference determining means comprises a differential amplifier.
References Cited (Backward Citations)
FR1298712A
Cited
US3211984A
Cited
US3287570A
Cited
US3348065A
Cited
US3508158A
Cited
US3805146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |