DocumentCode :
1043442
Title :
A CMOS switched transconductor mixer
Author :
Klumperink, Eric A M ; Louwsma, Simon M. ; Wienk, Gerard J M ; Nauta, Bram
Author_Institution :
MESA+ Res. Inst., Univ. of Twente, Enschede, Netherlands
Volume :
39
Issue :
8
fYear :
2004
Firstpage :
1231
Lastpage :
1240
Abstract :
A new CMOS active mixer topology can operate at low supply voltages by the use of switches exclusively connected to the supply voltages. Such switches require less voltage headroom and avoid gate-oxide reliability problems. Mixing is achieved by exploiting two transconductors with cross-coupled outputs, which are alternatingly activated by the switches. For ideal switching, the operation is equivalent to a conventional active mixer. This paper analyzes the performance of the switched transconductor mixer, in comparison with the conventional mixer, demonstrating competitive performance at a lower supply voltage. Moreover, the new mixer has a fundamental noise benefit, as noise produced by the switch-transistors and LO-port is common mode noise, which is rejected at the differential output. An experimental prototype with 12-dB conversion gain was designed and realized in standard 0.18-μm CMOS to operate at only a 1-V supply. Experimental results show satisfactory mixer performance up to 4 GHz and confirm the fundamental noise benefit.
Keywords :
1/f noise; CMOS analogue integrated circuits; MMIC mixers; UHF mixers; active networks; integrated circuit noise; 0.18 micron; 1 V; 1/f noise; 12 dB; CMOS active mixer topology; CMOS analog integrated circuits; LO-port; active circuits; active mixers; communication circuits; dielectric breakdown; down-conversion mixers; frequency conversion; gate-oxide reliability problems; integrated circuit noise; intermodulation distortion; linear trans-conductance; low supply voltages; low-noise design; microwave integrated circuits; microwave mixers; nonlinear circuits; switch-transistors; switched transconductor mixer; voltage headroom; white noise; CMOS analog integrated circuits; CMOS technology; Integrated circuit noise; Mixers; Performance analysis; Radio frequency; Switches; Transconductance; Transconductors; Voltage; $1/f$ noise; Active circuits; CMOS analog integrated circuits; active mixers; communication circuits; demodulation; dielectric breakdown; down-conversion mixers; frequency conversion; integrated circuit noise; intermodulation distortion; linear transconductance; low-noise design; low-voltage; microwave integrated circuits; microwave mixers; modulation; noise; nonlinear circuits; receiver; reliability; transmitter; white noise;
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/JSSC.2004.831797
Filename :
1317047
Link To Document :
بازگشت