Quadrature phase detector

Details Quadrature phase detector Quadrature phase detector

1997-02-27

1998-10-20

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By phase

327 7, H03K 526

Patent

active

058252096

ABSTRACT:
A quadrature phase detector includes a first load and a current source circuit. A first differential circuit and a second differential circuit coupled to the first load. In response to a first input signal, a first switching circuit couples the current source to the first differential circuit to form a first differential amplifier. The first switching circuit also couples the current source to the second differential circuit to form a second differential amplifier. The second differential amplifier is cross-coupled to the first differential amplifier. The first and second differential amplifiers are coupled to receive a differential second input signal, wherein the first and second input signals have a substantially different signal swing. A second switching circuit couples the current source to a second load in response to the complement of the first input signal. The cross-coupled first and second differential amplifiers provide a differential output signal corresponding to a quadrature phase error between the first and differential second input signals.

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