Passive mixer with OPA filter for DVB-H front-end in 65 nm digital CMOS technology

This paper presents a passive mixer combined with a 1st-order active low-pass filter implemented in a purely digital low-power 65 nm CMOS technology. The filter consists of a four-stage operational amplifier with two feed-forward paths for a 3 dB corner frequency of 4 MHz. The mixer offers a very low flicker noise corner frequency of 80 Hz for DVB-H application. A fabricated test chip with integrated clock regeneration circuit offers even for a very small clock input signal amplitude a maximum gain of 26 dB. The combination offers an IIP3 of 5 dBm while the mixer consumes 12.27 mA and the filter 4.42 mA from a 1.25 V supply. & 2012 Elsevier Ltd. All rights reserved.