Gain regulation circuit

Details Gain regulation circuit Gain regulation circuit

H - Electricity

04

M

330/37, 379/82

H04M 1/60 (2006.01)

Patent

CA 1200941

GAIN REGULATION CIRCUIT Abstract of the Disclosure A gain regulation circuit e.g. for a telephone subscriber's instrument, includes a plurality (2n + 1) of long tailed transistor pairs (TR51, TR52) one of which has a significantly higher gain than the remainder (2n). The circuit may be adjusted to a composite gain value between limits defined by the high and low gain pairs by providing a suitably weighted combination of these pairs. Typically this weighting is achieved by control currents (I1, I2, I3) fed into the tail circuits of the pairs.

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