A reconfigurable multi-mode multi-band transceiver for low power short-range wireless communication applications is presented. Its low intermediate frequency （IF） receiver with 3 MHz IF carrier frequency and the direct-conversion transmitter support reconfigurable signal bandwidths from 250 kHz to 2 MHz and support a highest data rate of 3 Mbps for MSK modulation. An integrated multi-band PLL frequency synthesizer is utilized to provide the quadrature LO signals from about 300 MHz to 1 GHz for the transceiver multi-band application. The transceiver has been implemented in a 0.18 μm CMOS process. The measurement results at the maximum gain mode show that the receiver achieves a noise figure （NF） of 4.9/5.5 dB and an input 3rd order intermodulation point （IIP3） of-19.6/-18.2 dBm in 400/900 MHz band. The transmitter working in 400/900 MHz band can deliver 10.2/7.3 dBm power to a 50 Ω load. The transceiver consumes 32.9/35.6 mW in receive mode and 47.4/50.1 mW in transmit mode in 400/900 MHz band, respectively.
A low cost integrated transceiver for mobile UHF passive RFID reader applications is implemented in a 0.18-μm CMOS process.The transceiver contains an OOK modulator and a power amplifier in the transmitter chain,an IQ direct-down converter,variable-gain amplifiers,channel-select filters and a 10-bit ADC in the receiver chain.The measured output P1dB power of the transmitter is 17.6 dBm and the measured receiver sensitivity is-70 dBm.The on-chip integer N synthesizer achieves a frequency resolution of 200 kHz with a phase noise of-104 dBc/Hz at 100 kHz frequency offset and-120.83 dBc/Hz at 1 MHz frequency offset.The transmitter,the receiver and the frequency synthesizer consume 201.34,25.3 and 54 mW,respectively.The chip has a die area of 4×2.5 mm2 including pads.
