Summing amplifier for developing a squelch and meter voltage in

Details Summing amplifier for developing a squelch and meter voltage in Summing amplifier for developing a squelch and meter voltage in

1978-09-29

1980-01-29

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

328156, 330147, H03F 368, H03F 345

Patent

active

041863542

ABSTRACT:
In a radio receiver IF amplifier, a high gain AGC circuit produces a constant signal output regardless of input signal levels in excess of a threshold value. A summing amplifier responds to the AGC voltage and the IF amplifier current to develop a d-c potential directly proportional to the signal input to the amplifier both above and below the AGC threshold. This voltage is useful in the squelch and signal strength meter circuits.

REFERENCES:
patent: 3434065 (1969-03-01), Chu et al.
patent: 3821656 (1974-06-01), Takeda et al.

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