Patent ID: 7538629
Filing Date: 2009-05-26
Classification: H03K

Abstract:
1. An oscillator circuit comprising: a reference current circuit generating a reference current; a charging and discharging circuit comprising a capacitor, a switching circuit switching the charging and discharging circuit from an initializing operation initializing a voltage of a terminal of the capacitor to a power supply voltage to a discharging operation allowing the reference current to flow from the capacitor and switching the charging and discharging circuit from the discharging operation to the initializing operation, and a detection circuit detecting the voltage of the terminal of the capacitor and outputting a clock based on the detection; and a control circuit controlling the switching circuit so that the charging and discharging circuit starts the initializing operation in response to the clock and starts the discharging operation after the initializing operation, wherein the control circuit comprises a delay circuit and a flip-flop, the clock being inputted to a first input terminal of the flip-flop, an output of the flip-flop being inputted to a second input terminal of the flip-flop through the delay circuit, and the output of the flip-flop being applied to the switching circuit.