Title :
A Direct-Conversion Mixer with a DC-offset Cancellation for WLAN
Author :
Xu, Q. ; Hu, X. ; Jan, Y. ; Shi, Y. ; Dai, F.F. ; Jaeger, R.C.
Author_Institution :
Chinese Acad. of Sci., Beijing
fDate :
Sept. 30 2007-Oct. 2 2007
Abstract :
This paper presents a 5GHz double-balanced mixer with DC-offset cancellation circuit for direct-conversion receiver compliant with IEEE 802.11a wireless LAN standard. The analog feedback loop is used, to eliminate the DC-offset at the output of the double-balanced mixer. The test results show that the mixer with DC-offset cancellation circuit has voltage conversion gain of 9.5dB at 5.15GHz, noise figure of 13.5dB, IIP3 of 7.6 dBm, 1.73mV DC-offset voltage and 67mW power with 3.3-V power supply. The DC-offset cancellation circuit has less than 0.1mm2 additional area and 0.3mW added power dissipation. The direct conversion WLAN receiver has been implemented in a 0.35mum SiGe BiCMOS technology.
Keywords :
mixers (circuits); wireless LAN; DC-offset cancellation circuit; IEEE 802.11a wireless LAN standard; WLAN; analog feedback loop; direct-conversion mixer; direct-conversion receiver; double-balanced mixer; frequency 5 GHz; BiCMOS integrated circuits; Circuit testing; Feedback loop; Germanium silicon alloys; Noise figure; Power dissipation; Power supplies; Silicon germanium; Voltage; Wireless LAN;
Conference_Titel :
Bipolar/BiCMOS Circuits and Technology Meeting, 2007. BCTM '07. IEEE
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-1019-4
Electronic_ISBN :
1088-9299
DOI :
10.1109/BIPOL.2007.4351828
