H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/34, 330/39
H03G 3/30 (2006.01) H03G 3/20 (2006.01)
Patent
CA 1191214
Abstract of the Disclosure An automatic level control circuit includes a variable gain amplifier supplied with an input signal, for outputting a level controlled signal. A detector is provided for detecting the output signal of the vari- able gain amplifier means and the output voltage of the detector is applied via a first resistor to a first input terminal of an operational amplifier which together with a capacitor serves as an integrator. A first reference voltage is applied to the first input terminal via a second resistor. A first diode has one end connected to the output terminal of the operational ampli- fier and the other end connected to one end of the capacitor and a second diode is connected between the other end of the capacitor and the first input terminal. A transistor has its first and second electrodes connected in parallel with the capacitor and its third electrode connected to the output terminal of the operational amplifier. The output side of the integrator is connected back to the variable gain amplifier via circuitry which causes a decrease in the gain of the variable gain amplifier only when the output voltage of the integrator appearing at the output terminal of the operational amplifier exceeds a second reference voltage.
442588
Corporation Nec
Smart & Biggar
LandOfFree
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