Patent ID: 9602054
Date: 2017-03-21
CPC Classifications: H03D,H03H,H03K

Claim:
1. An analog circuit for generating a periodic signal, comprising: oscillator circuitry for generating first and second periodic differential signals at a first frequency and at a selected phase angle relative to one another; at least one phase interpolator, having inputs receiving the first and second periodic differential signals, and having inputs receiving first and second differential gain signals, for generating a combined periodic signal having a frequency component corresponding to the first frequency and at a phase angle corresponding to a relationship of the first and second differential gain signals, wherein the at least one phase interpolator comprises: wherein the first differential gain signal is applied across the gates of the first and second transistors in first and second ones of the transistor pairs; wherein the second differential gain signal is applied across the gates of the first and second transistors in each of third and fourth ones of the transistor pairs; wherein the first periodic differential signal is applied across the gates of a first tail transistor associated with the first transistor pair, and of a second tail transistor associated with the second transistor pair; and wherein the second periodic differential signal is applied across the gates of a third tail transistor associated with the third transistor pair, and of a fourth tail transistor associated with the fourth transistor pair.