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http://dx.doi.org/10.5515/KJKIEES.2009.20.8.770

Design of QPSK Demodulator Using CMOS BPSK Receiver and Reflection-Type Phase Shifter  

Moon, Seong-Mo (Department of Electrical and Computer Engineering, University of Seoul)
Park, Dong-Hoon (Department of Electrical and Computer Engineering, University of Seoul)
Yu, Jong-Won (Department of Electrical Engineering, Korea Advanced Institute of Science and Technology)
Lee, Moon-Que (Department of Electrical and Computer Engineering, University of Seoul)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.20, no.8, 2009 , pp. 770-776 More about this Journal
Abstract
We propose and demonstrate an I/Q demodulator using four-port BPSK demodulator base on additive mixing and reflection-type phase shifter using hybrid technique. Previously, the conventional I/Q demodulator base on multiplicative or additive mixing method divides I/Q signal path from mixer to parallel-to-serial converter. In this paper, we propose new I/Q demodulator without dividing I/Q baseband signal path. The proposed schematic requires half size in implementation and half power consumption in baseband path compared with the conventional receiver. Also, the proposed receiver eliminates parallel-to-serial converter after data decoding. The proposed circuit has been successfully demodulated a QPSK signal with the L-band carrier frequency and 20 Mbps data rate.
Keywords
Multi-Port Receiver; Four-Port Receiver; Direct Conversion Receiver; Multiplicative Mixing; Additive Mixing; QPSK; Demodulator; Parallel-to-Serial(P/S) Converter; Reflection-Type Phase Shifter;
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  • Reference
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