A single-chip RF transceiver for quad-band GSM/GPRS applications

This paper presents a single-chip quad-band GSM/GPRS transceiver with fully-integrated VCOs in a 0.35 μm BiCMOS technology. The transceiver consists of an image-rejected low-IF receiver, an OPLL transmitter with TxVCO, a fractional-N frequency synthesizer with a RFVCO and LDO regulators. The receiver has a maximum gain of 100 dB with more than 110 dB dynamic range and the static reference sensitivity is better than -108 dBm. The transmitter delivers 5 dBm output power with 6° peak-to-peak and 2° rms phase errors and the 400 kHz modulation spectrum is better than -65 dBc. The power consumption during receiving and transmitting modes are 68 mA and 120 mA, respectively. This chip is housed in a 56-pin QFN package.