Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Patent
1997-12-23
1999-08-17
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
327235, 327238, 327254, 327234, H03H 1116, H03H 1126
Patent
active
059399163
ABSTRACT:
A discrete phase shifter and a method for discrete phase shifting in which an input signal is split into two signals. One of the split signals is phase shifted by a first fixed amount by a first fixed phase shifter cell, and the other split signal is phase shifted by a second fixed amount by a second fixed phase shifter cell. A selector is utilized to select at least one of the two split phase shifted signals and to input these to a vector summer. The vector summer synthesizes an output signal that is phase shifted with respect to the input signal. In this manner, the output signal is discretely phase shifted either by the first fixed amount, the second fixed amount, or, by selecting both of the split signals prior to vector summing, the sum of these amounts. Utilizing an electronically controlled phase shifter cell which is monolithically integratable to achieve the first and second fixed phase shifter cells permits implementation of this discrete phase shifter on a monolithic integrated circuit (MIC) with high gain at high frequencies (e.g. 10 GHz). It may be used in filter-based clock recovery systems.
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Jamal Riyaz
Taraschuk Terrance W.
Callahan Timothy P.
Luu An T.
Northern Telecom Limited
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