Title :
Highly linear down-conversion mixer in 65nm CMOS for a high supply voltage of 2.5V
Author :
Schweiger, Kurt ; Zimmermann, Horst
Author_Institution :
Inst. of Electrodynamics, Microwave & Circuit Eng., Vienna Univ. of Technol., Vienna, Austria
Abstract :
A direct down conversion Gilbert-type mixer in combination with an active low-pass filter for 4MHz is presented. The Gilbert-type mixer is enhanced with a source degeneration to improve the linearity performance. The active filter is a linearity enhanced differential amplifier with feedback network. For the high supply voltage of 2.5V additional over-voltage protection with cascodes is added to the circuit parts. The entire receiver part consumes 6.88mA from a 2.5V supply. A high gain of 26.6dB is achieved by the active mixer in combination with the active filter. The noise figure of the entire circuit is only 11.8dB. The input referred intercept point of 3rd-order is +18.6dBm.
Keywords :
active filters; differential amplifiers; low-pass filters; mixers (circuits); CMOS; active low pass filter; cascodes; current 6.88 mA; differential amplifier; direct down conversion Gilbert-type mixer; feedback network; frequency 4 MHz; gain 26.6 dB; high supply voltage; linear down-conversion mixer; linearity performance; noise figure 11.8 dB; over-voltage protection; size 65 nm; source degeneration; voltage 2.5 V; Active filters; Baseband; CMOS technology; Circuit noise; Digital video broadcasting; Frequency; Linearity; Low pass filters; Receivers; Voltage;
Conference_Titel :
Design and Diagnostics of Electronic Circuits and Systems (DDECS), 2010 IEEE 13th International Symposium on
Conference_Location :
Vienna
Print_ISBN :
978-1-4244-6612-2
DOI :
10.1109/DDECS.2010.5491785
