Phase shifter and current mode mixer

Details Phase shifter and current mode mixer Phase shifter and current mode mixer

2005-09-12

2009-06-09

Torres, Juan A (Department: 2611)

Pulse or digital communications

Transceivers

C455S073000, C710S001000

Reexamination Certificate

active

07545855

ABSTRACT:
An integrated circuit radio transceiver comprises an integrated phase shift mixer for generating a phase and frequency shifted output signal to at least a portion of one of a transmitter or receiver front end. The integrated phase shift mixer includes a phase shift block that is operable to produce a phase shifted current signal at an output of the phase shift block and a mixer that is operable to produce the phase and frequency shifted output signal based upon the phase shifted current signal. One aspect of the present invention is that the phase shift block produces an output as a current signal and the mixer block is operably disposed and formed to receive the current signal produced by the phase shift block. Thus, the mixer includes a folded cascode mixer that provides a substantially low input impedance.

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