US 8,712,357 B2 · LO generation with deskewed input oscillator signal

Abstract

Techniques for generating local oscillator (LO) signals are described. In one design, an apparatus may include a deskew circuit and a divider circuit. The deskew circuit may receive a differential input oscillator signal having timing skew and provide a differential output oscillator signal having reduced timing skew. The differential input oscillator signal may include first and second input oscillator signals, and the differential output oscillator signal may include first and second output oscillator signals. In one design, the deskew circuit may include first and second variable delay circuits that receive the first and second input oscillator signals, respectively, and provide the first and second output oscillator signals, respectively. Each output oscillator signal may have an adjustable delay selected to reduce timing skew. The divider circuit may divide the differential output oscillator signal in frequency and provide differential I and Q divided signals, which may be used to generate LO signals.

Claims23

Dependent claims

An apparatus comprising:

a deskew circuit operative to receive a differential input oscillator signal having timing skew and to provide a differential output oscillator signal having reduced timing skew;
and
a divider circuit coupled to the deskew circuit and operative to divide the differential output oscillator signal in frequency and to provide a differential inphase (I) divided signal and a differential quadrature (Q) divided signal;
wherein the differential input oscillator signal comprises first and second input oscillator signals, wherein the differential output oscillator signal comprises first and second output oscillator signals, and wherein the deskew circuit comprises:
a first variable delay circuit operative to receive the first input oscillator signal and provide the first output oscillator signal having an adjustable delay.

2 more elements

Dependencies are inferred from the claim text.

LO generation with deskewed input oscillator signal

Life of this patent

LO generation with deskewed input oscillator signal

Life of this patent

Abstract

Claims23