Crossover circuit for use in automatic gain control systems

Details Crossover circuit for use in automatic gain control systems Crossover circuit for use in automatic gain control systems

1980-12-29

1983-07-12

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330138, 358178, H03G 330

Patent

active

043933548

ABSTRACT:
A unity gain, closed loop, feedback amplifier is described which accurately defines the changeover point in an AGC system to provide a first output which varies in response to an AGC input signal and is indicative of the level thereof up to a predetermined threshold value and thereafter remains constant and then to provide a second output which is indicative of the applied AGC input signal becoming more positive than the threshold level. The amplifier changeover circuit comprises a first circuit loop and a second circuit loop coupled with a comparator amplifier which is adapted to receive the AGC input signal. With the AGC input signal being less than the threshold level the first circuit loop is responsive to increases in the input signal to provide an output signal which is indicative of the level thereof. During this region of the AGC input signal the second circuit loop is held non-responsive until such time that the AGC input signal becomes more positive than the threshold level at which time a second output a signal is produced therefrom which is indicative of the level of the AGC input signal. The output of the first circuit loop is maintained constant at a bias reference level during the interval that the second circuit loop is rendered responsive to the AGC input signal.

REFERENCES:
patent: 4246543 (1981-01-01), Noda et al.

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