Amplifiers – With d.c. reinsertion circuit
Patent
1980-01-16
1982-03-09
Mullins, James B.
Amplifiers
With d.c. reinsertion circuit
330129, 330136, 330279, 330281, H03F 2100
Patent
active
043191975
ABSTRACT:
An AC coupled amplifier system is protected from overloading input signals by means of a "bootstrap" circuit which provides a compensation signal substantially matching the overscale portion of such input signal and applies that compensation signal to the coupling capacitor as an offset in order to prevent excessive charge accumulation on that capacitor. A voltage controlled current source serves as a signal range limiter in the circuit and responds to overscale input signals by causing a circuit loop opening and forcing loop closure in a secondary feedback circuit from which the extent of input signal overscale is determined. The matching compensation signal is then derived from such determination. The protection circuit further provides a reset function to account for extended overscale input signal levels.
REFERENCES:
patent: 4048573 (1977-09-01), Evans et al.
Keuffel & Esser Company
Mullins James B.
White Lionel N.
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