SIGNAL SELECTING CIRCUIT OF FREQUENCY CONVERTER OF LOW NOISE

摘要

PURPOSE: A signal selecting circuit of a frequency converter of low noise is provided to directly select broadcasting signals according to a switching voltage of a digital satellite receiver for simplifying the circuit arrangement. CONSTITUTION: A signal selecting circuit of a frequency converter of low noise includes a first switching circuit part(24) mounted on a signal line between a first input signal terminal and an output signal terminal to be switched by a bias voltage(Vcc) and a switching voltage(Vsw), and a second switching circuit part(25) mounted on a signal line between a second input signal terminal and the output signal terminal to be switched by the bias voltage and the switching voltage.