A 430MHz, -52dB THD, single transconductor, 3rd-order low-pass filter and its extension to a 5th-order, in a 0.5 µm CMOS process

Based on a new approach to implement second-order stages, a third-order and a fifth-order continuous-time low-pass filters were implemented. The filters fabricated in a 0.5µm CMOS process, achieved more than 430MHz, -3dB bandwidth and less than -52dB THD for a 400mVp-p input signal. All these accomplished with a factor of about four reduction in hardware and power. The bandwidth, output voltage swing, and dynamic range are far larger than any low-pass CMOS filter thus far reported for filters, with bandwidth higher than 100MHz.