CURRENT CONTROLLED OSCILLATOR

A frequency range can be widened without increasing the power consumption. Current circuits (1a,1b) output charging currents based on a control current. Capacitors (C1,C2), which are associated with the respective current circuits (1a,1b), are supplied with the charging currents. Discharge transistors (M1,M3), which are associated with the respective capacitors (C1,C2), cause the respective capacitors (C1,C2) to discharge. Switching transistors, which are connected between the current circuits (1a,1b) and the capacitors (C1,C2), open/close the paths between the current circuits (1a,1b) and the capacitors (C1,C2) in accordance with the voltages of the capacitors (C1,C2). Signal output transistors (M5,M6), the gates of which are connected between the current circuits (1a,1b) and the switching transistors (M2,M4), output signals to a flip-flop (2) in accordance with the charging currents. The flip-flop (2) alternately drives the discharge transistors (M1,M3) in response to the signals.