A clock generation circuit is provided for improving the accuracy of a low power oscillator circuit contained therein. The clock generation circuit includes a crystal-less oscillator having at least two distinct frequency modes, including a low frequency mode and a high frequency mode. In some cases,...http://www.google.co.uk/patents/US8049569?utm_source=gb-gplus-sharePatent US8049569 - Circuit and method for improving the accuracy of a crystal-less oscillator having dual-frequency modes
