A CMOS Quadrature Down-Converter for Direct-Conversion Receiver of 5.15-5.825GHz Wireless LAN
نویسندگان
چکیده
A CMOS quadrature down-converter for a direct-conversion receiver of 5.15-5.825GHz wireless LAN is described. The down-converter consists of two sub-harmonic mixers, for I and Q channels, and an LO generation network. In order to prevent the low-frequency component generated by the even-order distortion of the transconductance stage from being leaked to the mixer output, transconductance and switching stages are AC coupled. LO signals spaced by 45 for quadrature downconversion with sub-harmonic mixing are generated by a 3-stage poly-phase filter and an interpolation circuit. The simulation results including all the parasitics show 11.8dB NF at 100kHz output frequency, 14dB conversion gain with 1kΩ load, and 2.4dBm iIP3 while consuming 84mW under 1.8V supply. The quadrature downconverter is under fabrication with the other receiver blocks in a 0.18μm CMOS technology.
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