| 摘要 |
PURPOSE:To miniaturize the amplifier, by using two sets of transistors (TRs) oppositely poled with each other and connected in series for amplifying power and detecting the temperature of each TR for turning off the TRs of adjacent sets so as to decrease the size of a radiator provided additionally. CONSTITUTION:An input signal is applied to each base of two sets of TRs 2, 2' and 3, 3' oppositely poled with each other and connected in series from an input terminal 1. The emitter of the TRs2, 2' is connected to an output terminal 6, from which an output signal is applied to a load 7, and the collector is connected to power supplies 4, 4' through switching diodes 8, 8'. The emitter of the TRs 3, 3, is connected to the collector of the TRs 2, 2', and the collector is connected to power supplies 5, 5'. The radiator 9 dissipates the heat generated from the TRs 2, 2' and 3, 3', and a control circuit 11 controls the switching of switches 12, 12' connected between the TRs 3, 3' and the input terminal 1 with an output of a detector 10. Thus, the size of the radiator 9 is reduced and the power amplifier is miniaturized. |
