Patent ID: 9240879
Filing Date: 2016-01-19
CPC Classification: H03K,H03L,H04B,H04L

Claim Text:
1. A signal generator, comprising: a relative delay unit configured to delay differential input signals and generate four delayed signals; a phase detector, communicatively coupled to the relative delay unit, configured to generate, according to the four delayed signals, quadrature four phase output signals, a first voltage signal and a second voltage signal, wherein a difference of the first and the second voltage signals indicates a phase error of the quadrature four phase output signals, wherein the frequencies of the four delayed signals are the same as the frequencies of the quadrature four phase output signals; a first amplifier, communicatively coupled to the phase detector, configured to amplify the difference of the first and the second voltage signals and generate an amplified voltage difference of the first and the second voltage signals; and a loop filter, communicatively coupled to the first amplifier, configured to filter the amplified voltage difference and generate a tuning voltage signal, wherein the loop filter is also communicatively coupled to the relative delay unit, and the relative delay unit adjusts a delay of the four delayed signals according to the tuning voltage signal.