A CMOS Channel-Select Filter for a Direct-Conversion Wireless Receiver
Recent research shows the feasibility of CMOS RF circuit blocks in the 1 GHz frequency range [1-8]. These elementary RF building blocks have recently been assembled into subcircuits, such as a receiver front-end and a spread-spectrum transmitter [9]. On-chip filtering remains key to a totally integrated wireless receiver, and this is one of the first reports on a CMOS filter for a wireless receiver. The channel-select filter must satisfy some exacting requirements. The first and most important is selectivity. A filter with a sharp cutoff should select the desired channel, and attenuate all other adjacent users. An active implementation of the filter must itself be low noise so as not to degrade the overall receiver noise figure, and it must have wide dynamic range so that out-of-band interferers, prior to filtration, do not ...
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