Attenuator unit, step attenuator, and electronic apparatus

摘要

An attenuator unit (100) for attenuating a signal, the unit includes a pi -type attenuator having a first resistor (106) and second and third resistors (108, 110) which are arranged on both sides of the first resistor, a first transistor (102) connected in parallel with the first resistor, and a second transistor (104) connected between a joint node of the second resistor and the third resistor and a first voltage level (112). In the unit, by controlling a gate voltage of the first transistor and a gate voltage of the second transistor, an attenuation value of the attenuator unit is changed. <IMAGE>