Patent ID: 7245895

Claim:
An attenuator with switch function, comprising: a first variable resistor inserted in a first signal line which connects a first signal input part with a first signal output part; a second variable resistor inserted in a second signal line which is disposed parallel to said first signal line and connects a second signal input part with a second signal output part; a first and a second reference voltage applying parts which are connected respectively with said first and said second variable resistors and are applied respectively with different reference voltages; and a gain control voltage applying part which is connected with each one of said first and said second variable resistors via a common gain control line, wherein as the attenuation of each one of said first and second variable resistors is controlled via said gain control voltage, either one of outputs on said first and second signal lines is blocked and the gain of the remaining output on said first and second signal lines is controlled linearly and continuously.