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This paper presents a CMOS RF tunable 4th-order active bandpass filter with the proposed inductor-less biquads. The NMOS cross-coupled pair is utilized in the biquad for the positive-feedback to form the complex pole, which enables the filter working at high frequency of 5GHz with low power of only 4.8mW from 1.2V power supply. Due to the inductor-less topology, the proposed filter only occupies 0...
A low power inductorless variable gain amplifier (VGA) for wideband communication systems is presented in this paper. It is a resistor feedback close-loop amplifier based on a proposed wideband operational amplifier. The operational amplifier is constructed by an artificially differential N/P complementary cascode amplifying stage for high gain, and a self-biased N/P complementary source follower...
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