Patent ID: 7274236
Filing Date: 2007-09-25
Classification: H03H,H03K

Abstract:
1. A delay line for producing an output signal of a controlled fourth phase relative to a first input signal of a first phase and a second input signal of a second phase, comprising: at least one phase mixer block for producing at its output a third phase intermediate the first and second phases, wherein the phase mixer block comprises a first input for receiving either the first input signal or the second input signal, and a second input for receiving the other of the first input signal or the second input signal; a switch for controllably determining to which of the first and second inputs the first and second input signals are sent; and a delay circuit for receiving the output of the phase mixer block, wherein the delay circuit outputs the output signal with a fourth phase; wherein the first input signal, the second input signal, and the output signal all comprise digital clock signals.