A Low-IF RX two-point Sigma Delta-modulation TX CMOS single-chip bluetoothsolution

A new low-cost concept for a system-on-chip Bluetooth solution is proposed in this paper. The single chip includes all necessary baseband and RF parts to achieve full Bluetooth functionality and is implemented in a standard 0 .25-mum CMOS technology. The two-point modulation fractional N phase-locked loop achieves a phase noise of -124 dBc/Hz at 3-MHz offset. The sensitivit y of the embedded low-IF receiver is measured to be - 82 dBm at a bit error rate of 0.1 %. The power supply voltages for the digital and analog parts are internally regulated to 2.65 V. The maximum current consumption of the analog part is 60 mA.