VERSTERKERKETEN.

摘要

A transistor amplifier is described in which the input resistance and the quiescent D.C. input voltage level are maintained at predetermined values regardless of the beta current gain of the bipolar transistor by a compensation means having a single control. The compensation means includes a fixed base resistor connected at one terminal to the base input source of D.C. compensation current which are connected in common to the other terminal of the fixed base resistor. The variable base resistor functions as the control for simultaneous adjustment of the input resistance to the value of the fixed base resistor and adjustment of the input voltage level of such transistor amplifier to zero. This is achieved by applying a D.C. compensation current to such common connection which is equal to the emitter bias current times the ratio of the emitter resistance divided by the fixed base resistor of such transistor.