Analysis and design of 4-path filter using gyrator based complex impedance

The high-Q bandpass filter is realized utilizing two gyrators and an arrangement of four baseband capacitors with NMOS switches, driven by 4-phase 25% duty cycle clock signals. This paper also analyzes the performance of the proposed filter against imperfections such as thermal noise of the switches. It will be shown that the noise performance of the proposed circuit is in an acceptable range.