Patent ID: 8890632
Filing Date: 2014-11-18
Classification: H03B

Abstract:
1. An oscillator circuit comprising: an oscillator comprising a first terminal and a second terminal; a first capacitor element connected between the first terminal of the oscillator and a ground terminal; a second capacitor element connected between the second terminal of the oscillator and the ground terminal; an amplifier circuit connected parallel to the oscillator; a timer circuit counting time passing from a beginning of oscillation of the oscillator circuit to a stabilization of oscillation of the oscillator circuit; and a control circuit controlling a driving capacity of the amplifier circuit in accordance with the time counted by the timer circuit, wherein the timer circuit is configured to count only one time period for the control circuit to control the driving capacity of the amplifier circuit, the amplifier circuit comprises a first inverter circuit and a second inverter circuit that are connected parallel to the oscillator and independently controlled by the control circuit, the first and second inverter circuits are connected to the oscillator while the timer circuit counts the time passing from the beginning of oscillation of the oscillator circuit to the stabilization of oscillation, and wherein the first inverter circuit has first and second inverter transistors, the second inverter circuit has first and second inverter transistors, and sizes of corresponding inverter transistors differ between the first inverter circuit and the second inverter circuit such that the first and second inverters have different driving capacities.