A transistor audio amplifier with input impedance independent of the load and adjustable continuously up to a value of the order of is described. The amplifier consists of a unilateralizedhook common collector configuration and has large power gain, very low output impedance. Its noise figure and dependence upon temperature, frequency, bias, and load are discussed.
Keywords :
Art; Circuit theory; Frequency; High power amplifiers; Impedance; Low-noise amplifiers; National electric code; Noise figure; Temperature dependence;