direct conversion receiver


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direct conversion receiver

Also called a "tuned radio frequency" (TRF) receiver, it is a radio receiver that detects and demodulates the carrier signal broadcast by the station without using an intermediate frequency (IF) stage. A variable filter is tuned to filter out everything but the desired radio station's carrier frequency. Along with the homodyne receiver, direct conversion was one of the earlier methods of building radios, both of which were superseded by the superheterodyne approach. See superheterodyne receiver.
References in periodicals archive ?
The AD6546 Othello-E transceiver uses a closed-loop polar modulation transmitter and direct conversion receiver for EDGE/GPRS networks, and the AD6548 Othello-G transceiver supports GPRS operation with a low-cost, small PCB-area solution.
It is a complete radio design that combines multiple functions, including an RF front end, mixed-signal baseband section, frequency synthesizers, two analog-to-digital converters and two direct conversion receivers in a single chip.
The low-IF (Intermediate Frequency) radio receiver architecture employed in this design, adapted from high-efficiency pager technology, offers lower power consumption and better immunity to interference than direct conversion receivers.
In addition, by adopting a new type of system architecture, the design effectively suppresses the DC offset resulting from direct conversion receivers well below noise levels.
The calibration mode is especially suited for direct conversion receivers (DCR) during DC-calibration period and offers a better impedance matching at the output compared to the output matching of inactive LNA.