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A single-chip 12.7 Mchips/s digital IF BPSK direct sequence spread-spectrum transceiver in 1.2 μm CMOS

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4 Author(s)
Chien, C. ; Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA ; Jain, R. ; Cohen, E.G. ; Samueli, H.

This paper describes a fully integrated digital-spread spectrum transceiver chip fabricated through MOSIS in 1.2 μm CMOS. It includes a baseband spread spectrum transmitter and a coherent intermediate frequency (IF) receiver consisting of a Costas loop, an acquisition loop for the pseudo-noise (PN) sequence, and a clock recovery loop with a 406.4 MHz onchip numerically controlled oscillator (NCO). The transceiver is capable of operating at a maximum IF sampling rate of 50.8 MS/s and a maximum chip rate of 12.7 R Mchips/s (Mcps) with selectable data rates of 100, 200, 400, and 800 kbps. At the maximum operating speed of 50.8 R MS/s, it dissipates 1.1 W. In an additive white Gaussian noise channel the IF receiver achieves a receiver output SNR within 1 dB of theory and can acquire code with a wide range of input SNR from -17 dB to over 30 dB. The transceiver chip has been interfaced to an RF up/down converter to demonstrate a wireless voice/data/video link operating in the 902-928 MHz band

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:29 ,  Issue: 12 )