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This paper describes the design of an integrated duplexer with electrical balance network using the phase locked loop (PLL) for impedance variation tracking. The hybrid transformer is devised for blocking the transmitted signal leaking to the receiver. We suggest a method of impedance tracking based on PLL system, which can maintain high isolation between the transmitter and the receiver. The PLL...
A fully integrated direct-conversion mobile-TV tuner for DVB-H/T and T-DMB/DAB applications was fabricated using 0.18 um CMOS process. This tuner has the good SNR and immunity performance over wide dynamic range for multi-band and multi-mode applications with the automatic gain control and calibration schemes. The power consumption is 127 mW for VHF and UHF, and 135 mW for L-band at 1.8 V supply voltage.
We report a high performance NPN bipolar junction transistor (BJT) processed in standard CMOS process that is applied to realize the direct conversion GSM receiver and DVB-H tuner. Through the variation of the base doping profile, performance of the NPN BJT has been tailored to meet the requirements of the RF circuits. Careful optimization is performed using both simulation and experiment. Optimized...
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