Patent US3720880A successfully refreshed from Google Patents.
US3720880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power amplifying device for amplitude modulated high frequency signals
Assignee: Thales SA
•
Filing: 1971-10-13
•
Granted: 1973-03-13
•
Expires: 1991-10-13
Abstract
Abstract In a power amplifying device comprising a linear push-pull amplifier the transistors of which are mounted in a common emitter arrangement, the difference between the d.c. supply voltage and the variable peak voltage Vm appearing on the collectors of the transistors for each period of the input signal, is maintained constant through supplying to the amplifier a d.c. supply voltage Va equal to Vm + VD where VD is a predetermined voltage. This is obtained through detecting the peak values of the input signal by means of a peak detector whose output signal is amplified by an auxiliary amplifier, the output voltage of which is supplied as a d.c. supply to the push-pull amplifier. A feedback circuit maintain the relation Va Vm + VD when the gain of the transistors of the push-pull amplifier varies.
Inventors
- 👤 Seigneur P Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:57
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036; H03G3/3042; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0211; H03F1/0216; H03F1/0222; H03F1/0227; H03F1/34; H03F1/345; H03F2200/00; H03F2200/192; H03F2200/228; H03F2200/504
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
A power amplifying device for amplifying an amplitude modulated high frequency signal, said device comprising : a coupler having an input for receiving said high frequency signal, a first output and a second output ; a linear transistorized amplifier having a signal input connected to said first output, a d.c. supply input, a main output for delivering the amplified signal and an auxiliary output ; a peak detector having an input connected to said second output of said coupler, and an output ; a variable gain amplifier having a gain control input, a signal input connected to said peak detector output and an output connected to said d.c. supply input of said transistorized amplifier ; a feedback circuit for maintaining at a constant value the difference between the output voltage of said variable gain amplifier and the instantaneous level of the envelope signal of said amplified signal, said feedback circuit having an input connected to the output of said variable gain amplifier, a further input coupled to said auxiliary output of said transistorized amplifier, and an output coupled to said gain control input.
Claim 2
Dependent Claim
183 words
A power amplifying device for amplifying an amplitude modulated high frequency signal, said device comprising : a coupler having an input for receiving said high frequency signal, a first output and a second output ; a linear transistorized amplifier having a signal input connected to said first output, a d.c. supply input, a main output for delivering the amplified signal and an auxiliary output ; a peak detector having an input connected to said second output of said coupler, and an output ; a variable gain amplifier having a gain control input, a signal input connected to said peak detector output and an output connected to said d.c. supply input of said transistorized amplifier ; a feedback circuit for maintaining at a constant value the difference between the output voltage of said variable gain amplifier and the instantaneous level of the envelope signal of said amplified signal, said feedback circuit having an input connected to the output of said variable gain amplifier, a further input coupled to said auxiliary output of said transistorized amplifier, and an output coupled to said gain control input.
Claim 3
Dependent Claim
183 words
A power amplifying device for amplifying an amplitude modulated high frequency signal, said device comprising : a coupler having an input for receiving said high frequency signal, a first output and a second output ; a linear transistorized amplifier having a signal input connected to said first output, a d.c. supply input, a main output for delivering the amplified signal and an auxiliary output ; a peak detector having an input connected to said second output of said coupler, and an output ; a variable gain amplifier having a gain control input, a signal input connected to said peak detector output and an output connected to said d.c. supply input of said transistorized amplifier ; a feedback circuit for maintaining at a constant value the difference between the output voltage of said variable gain amplifier and the instantaneous level of the envelope signal of said amplified signal, said feedback circuit having an input connected to the output of said variable gain amplifier, a further input coupled to said auxiliary output of said transistorized amplifier, and an output coupled to said gain control input.
Claim 4
Dependent Claim
183 words
A power amplifying device for amplifying an amplitude modulated high frequency signal, said device comprising : a coupler having an input for receiving said high frequency signal, a first output and a second output ; a linear transistorized amplifier having a signal input connected to said first output, a d.c. supply input, a main output for delivering the amplified signal and an auxiliary output ; a peak detector having an input connected to said second output of said coupler, and an output ; a variable gain amplifier having a gain control input, a signal input connected to said peak detector output and an output connected to said d.c. supply input of said transistorized amplifier ; a feedback circuit for maintaining at a constant value the difference between the output voltage of said variable gain amplifier and the instantaneous level of the envelope signal of said amplified signal, said feedback circuit having an input connected to the output of said variable gain amplifier, a further input coupled to said auxiliary output of said transistorized amplifier, and an output coupled to said gain control input.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |