Patent ID: 8742855
Filing Date: 2014-06-03
Classification: H03K

Abstract:
1. A feed-forward ring oscillator, comprising: a plurality of delay cells for receiving a first differential input signal pair and a second differential input signal pair, and outputting a differential output signal pair, wherein: the delay cells are connected in a ring shape; each of the delay cells receives a differential output signal pair of a delay cell of a previous stage as a first differential input signal pair and receives a differential output signal pair of a delay cell of a stage before the previous stage as a second differential input signal pair; each of the delay cells comprises multiple independent gate field-effect transistors; the multiple independent gate field-effect transistors comprise first and second multiple independent gate field-effect transistors, and third and fourth multiple independent gate field-effect transistors that are connected to the first and second multiple independent gate field-effect transistors in series, respectively; a first signal of the second differential input signal pair is input to a first gate of the first multiple independent gate field-effect transistor; a second signal of the second differential input signal pair is input to a first gate of the second multiple independent gate field-effect transistor; a control voltage is connected to a second gate of the first multiple independent gate field-effect transistor and a second gate of the second multiple independent gate field-effect transistor; a first signal of the first differential input signal pair is input to two gates of the third multiple independent gate field-effect transistor; and a second signal of the first differential input signal pair is input to two gates of the fourth multiple independent gate field-effect transistor.