TRF1020

The TRF1020 is a single-chip radio frequency (RF) downconverter suitable for 900-MHz GSM applications. It combines in one small package an LNA, an RF mixer, an IF mixer, two IF amplifiers, an I and Q mixer, and one buffered VCO. The TRF1020 requires few external components.

The LNA TRF1020 has a nominal gain of 12.4 dB and noise figure of 2.1 dB. The first RF mixer has a conversion gain of 13.4 dB and a single-sideband (SSB) noise figure of 8.3 dB. The IF amplifiers have combined variable gain from 0 to 84 dB in approximately 3-dB steps. The IF amplifier frequency range of TRF1020 is 40 to 180 MHz for the first IF amplifier and 10 to 180 MHz for the second IF amplifier. The local oscillator of the I and Q mixer operates at four times the last frequency of the IF mixer.

Power consumption of TRF1020 is kept to a minimum and can be further reduced by dynamically placing selected functions in standby power-down mode when not required. Power-down control is provided through the three-line digital serial interface.