Patent ID: 9024693
Filing Date: 2015-05-05
Classification: H03B,H03K,H03L

Abstract:
1. A crystal-less clock generator (CLCG), comprising: a first oscillation circuit, controlled by a control signal for generating an output clock signal of the CLCG; a second oscillation circuit, generating a reference clock signal; and a control circuit, coupled to the first oscillation circuit for receiving the output clock signal, and coupled to the second oscillation circuit for receiving the reference clock signal, wherein the control circuit is used to generate the control signal for the first oscillation circuit, wherein the control circuit calculates a first difference between a frequency of the output clock signal and a first reference frequency, calculates a second difference between a frequency of the reference clock signal and a second reference frequency, and generates the control signal for the first oscillation circuit according to a relationship between the first difference and the second difference, wherein the control circuit takes a frequency of the output clock signal measured after the first oscillation circuit is initialized to serve as the first reference frequency, and takes a frequency of the reference clock signal measured after the second oscillation circuit is initialized to serve as the second reference frequency.