OSCILLATION CIRCUIT

摘要

It is possible to reduce a distortion component of an oscillation signal. An oscillation signal generation circuit (10) generates, as oscillation signals, a first generation oscillation signal (202) and a second generation oscillation signal (204) which are in the relationship of a differential signal to each other. A differential amplifier (12) subjects the first generation oscillation signal (202) and the second generation oscillation signal (204) respectively to differential amplification processing and outputs a first amplified oscillation signal (206) and a second amplified oscillation signal (208). A conversion circuit (14) converts the first amplified oscillation signal (206) and the second amplified oscillation signal (208) into an output current oscillation signal (214) in which sink current and source current are switched alternately. A variable current source (32) supplies conversion drive current (218) for driving the conversion circuit (14) so as to convert the voltages of the first amplified oscillation signal (206) and the second amplified oscillation signal (208) into currents. Moreover, by adjusting a value of the variable resistor contained in the variable current source (32) from outside, it is possible to adjust the amount of the conversion drive current (218).