A CMOS offset phase locked loop for a GSM transmitter
This paper describes a CMOS Offset Phase Locked Loop (OPLL) for a global system for mobile communications (GSM) transmitter. The OPLL is a PLL with a down-conversion mixer in the feedback path and is used in the transmit (Tx) path as a frequency converter. It has a tracking bandpass filter characteristic in such a way that the OPLL can suppress the noise in the GSM receiving band (Tx noise) without a duplexer. When the loop bandwidth of the OPLL was 1.0 MHz: the Tx noise level of -163.5 dBc/Hz, the phase error of 0.66 degrees rms, and the settling time of 40 mu s were achieved. The IC was implemented by using 0.35-mu m CMOS process. It takes 860 mu mx620 mu m of total chip area and consumes 17.6 mA with a 3.0 V power supply.
cmos gsm transmitter pll