tailieunhanh - Báo cáo hóa học: " An Analog Correlator for Ultra-Wideband Receivers Chunjiang Tu"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: An Analog Correlator for Ultra-Wideband Receivers Chunjiang Tu | EURASIP Journal on Applied Signal Processing 2005 3 455-461 2005 Hindawi Publishing Corporation An Analog Correlator for Ultra-Wideband Receivers Chunjiang Tu Institute of Microelectronics of Tsinghua University District 9 East Main Building Beijing 100084 China Email tcj00@ Boan Liu Institute of Microelectronics of Tsinghua University District 9 East Main Building Beijing 100084 China Email baliu@ Hongyi Chen Institute of Microelectronics of Tsinghua University District 9 East Main Building Beijing 100084 China Email chy-ime@ Received 29 September 2003 Revised 5 March 2004 We present a new analog circuit exhibiting high bandwidth and low distortion specially designed for signal correlation in an ultra-wideband receiver front end. The ultra-wideband short impulse signals are correlated with a local pulse template by the correlator. A comparator then samples the output for signal detection. A typical Gilbert mixer core is adopted for multiplication of broadband signals up to 10 GHz. As a result of synchronization of the received signal and the local template the output voltage level after integration and sampling can reach up to 100 mV which is sufficient for detection by the comparator. The circuit dissipates about 30 mW from double voltage supplies of 4 V and V using pm SiGe BiCMOS technology. Simulation results are presented to show the feasibility of this circuit design for use in ultra-wideband receivers. Keywords and phrases analog correlator Gilbert cell ultra-wideband receiver. 1. INTRODUCTION Ultra-wideband UWB communication systems have been drawing increasing attention in recent years due to their attractive features of high transmission rates and low cost. UWB systems transmit information through short impulses in contrast to traditional wireless communication systems which use sinusoidal carriers. In impulse radio systems several modulation techniques maybe deployed including pulse position .

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