A BiCMOS Seventh-Order Lowpass Channel-Select Filter Operating at 2.5 V Supply for a Spread-Spectrum Wireless Receiver

Moonjae JEONG  Satoshi TANAKA  Shigetaka TAKAGI  Nobuo FUJII  Hiroshi KAWAMOTO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E83-A   No.2   pp.210-219
Publication Date: 2000/02/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
spread-spectrum receiver,  channel-select filter,  linear phase,  continuous-time filters,  

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This paper presents a 7th-order channel-select filter for a spread-spectrum wireless receiver operating with a minimum power supply of 2.5 V. The channel-select filter implements a sharp transition from 2 MHz to 4 MHz and a stopband attenuation of 50 dB. The 7th-order filter is realized by a cascade of a passive RC integrator, a 3rd-order leapfrog filter, an operational amplifier based differentiator, a 2nd-order notch filter, and a 1st-order allpass filter. It is designed in a 0.35 µm single-poly BiCMOS process. Simulation results show feasibility of the proposed filter.