Title :
Design and implementation of an all-digital QPSK direct-sequence spread-spectrum transceiver IC
Author :
Wu, Jen-Shi ; Liu, Ming-Luen ; Ma, Hsi-Pin ; Chiueh, Tzi-Dar
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
In this paper, an all-digital differentially encoded quaternary phase shift keying (DEQPSK) direct sequence spread-spectrum (DSSS) transceiver is proposed. It consists of two parts: a baseband/IF spread-spectrum transmitter and a coherent intermediate frequency (IF) receiver. The center frequency of this IF receiver is 11 MHz and the sampling rate is 44 Msamples/second. Modulation/demodulation, carrier recovery, PN code acquisition, and differential coding are all provided within a single chip. Functional optimization and architecture design have been done before layout implementation. Furthermore, we added testing circuits in this chip and thus each functional block is easily tested. The chip was fabricated through TSMC 0.8 μm n-well CMOS SPDM technology. The maximum operational clock rate is measured at over 90 MHz (5 V, over 4 Mbps), and the minimum supply voltage for 2 Mbps (44 MHz) rated speed is 2.6 V
Keywords :
CMOS digital integrated circuits; VLSI; digital radio; modulation coding; pseudonoise codes; quadrature phase shift keying; spread spectrum communication; transceivers; 0.8 micron; 11 MHz; 2 Mbit/s; 2.6 V; 4 Mbit/s; 44 MHz; 5 V; 90 MHz; DEQPSK; IF receiver; PN code acquisition; TSMC technology; VLSI; all-digital QPSK DS-SS transceiver IC; architecture design; baseband/IF spread-spectrum transmitter; carrier recovery; center frequency; coherent intermediate frequency receiver; differential coding; differentially encoded quaternary phase shift keying; direct sequence spread spectrum; functional optimization; maximum operational clock rate; minimum supply voltage; modulation/demodulation; n-well CMOS SPDM technology; sampling rate; testing circuits; Baseband; CMOS technology; Circuit testing; Frequency; Phase shift keying; Quadrature phase shift keying; Sampling methods; Spread spectrum communication; Transceivers; Transmitters;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1996. PIMRC'96., Seventh IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
0-7803-3692-5
DOI :
10.1109/PIMRC.1996.568437
