Digitally programmable I/Q phase offset compensation

Details Digitally programmable I/Q phase offset compensation Digitally programmable I/Q phase offset compensation

2006-06-27

2006-06-27

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

C327S268000, C327S284000

Reexamination Certificate

active

07068089

ABSTRACT:
Delays are produced in differential signals using a variable capacitance provided by MOS varactors coupled between the differential signals. The capacitance values of the MOS varactors is controlled by a bias voltage applied to the bodies of the varactors. Selective application of bias voltages to the MOS varactors may be employed to selectively delay one pair of differential signals with respect to another pair of differential signals so as to change the relative phases of the signals. A logic circuit may be used to control the application of bias voltage to the MOS varactors so that signal phases may be adjusted in a manner that is predictable and programmable. These methods may be implemented to compensate for phase offsets between in-phase and quadrature signals of a local oscillator.

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PCT search report for PCT/US05/18435 dated Oct. 24, 2005.

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