Direct conversion RF transceiver with automatic frequency...

Details Direct conversion RF transceiver with automatic frequency... Direct conversion RF transceiver with automatic frequency...

2007-05-29

2007-05-29

Payne, David C. (Department: 2611)

Pulse or digital communications

Transceivers

C375S222000, C375S259000, C375S316000, C375S344000, C375S346000, C455S073000, C710S001000

Reexamination Certificate

active

10255378

ABSTRACT:
A single chip radio transceiver includes circuitry that enables received wideband RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to wideband RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry includes a low noise amplifier, automatic frequency control circuitry for aligning a local oscillation frequency with the frequency of the received RF signals, signal power measuring circuitry for measuring the signal to signal and power ratio and for adjusting frontal and rear amplification stages accordingly, and finally, filtering circuitry to filter high and low frequency interfering signals including DC offset.

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