Current mode phase shifter, mixer and amplifier

Details Current mode phase shifter, mixer and amplifier Current mode phase shifter, mixer and amplifier

2005-09-12

2009-06-09

Torres, Juan A (Department: 2611)

Pulse or digital communications

Transceivers

C455S073000, C710S001000

Reexamination Certificate

active

07545856

ABSTRACT:
An integrated circuit radio transceiver 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 with a low input impedance that is operable to produce a phase and frequency shifted output current 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. Similarly, an operational amplifier configured in a low input impedance mode is provided to receive and amplify a current signal mixer output, all to maximize signal processing head room reduce circuit noise and improve linearity.

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