Patent ID: 9602052
Date: 2017-03-21
CPC Classifications: G06F,H03B,H03K,H03L

Claim:
1. An oscillator comprising: first, second, and third current sources; a resistor having a first terminal, and a second terminal connected to a reference voltage; a first capacitor having a first terminal, and a second terminal connected to the reference voltage; a second capacitor having a first terminal, and a second terminal connected to the reference voltage; a switch circuit through which each of the current sources is connectable to the first terminal of one of the resistor and the two capacitors to supply current thereto; a comparator having a first input, a second input, and configured to generate an output signal by comparing voltage levels at the first input and the second input; and a switch controller configured to generate control signals for the switch circuit and an oscillation output signal for each of multiple periods based on the output signal from the comparator, wherein during a first period, which is one of the multiple periods, the switch circuit is controlled to connect the first current source to the first terminal of the first capacitor, the second current source to the first terminal of the resistor, the first terminal of the resistor to the first input of the comparator, and the first terminal of the first capacitor to the second input of the comparator.