Sub-Harmonic Mixer
Date Issued
2005
Date
2005
Author(s)
Chien, Wei-En
DOI
en-US
Abstract
This report describes sub-harmonic mixers for 802.11a applications. We design some mixers to verify sub-harmonic mixing techniques. In our design, these circuits convert a 5.8 GHz RF signal directly to baseband using a 2.9 GHz LO frequency. We use poly-phases filter to generate quadrature LO signals. We implement some different topologies of poly-phases filters to discuss issues in poly-phases filter designation. For our mixers, we cite to some related references and use a parallel connected diode and common gate topology for its input stage and a folded PMOS switch as its switch quad. An input impedance match is concerned. Besides, to achieve I / Q two channel, the sub-harmonic mixer need octet-phases LO signals to attain this goal, only poly-phases filters couldn’t provide so many phase outputs. Therefore we utilize active phase generator to generate the necessary LO signals. These mixers have voltage conversion gain of about 7dB to 9dB, noise figure of 14 to 19 dB, LOR of -22 to -26dB and an IIP3 of 7 to 9dBm. These performances have been verified using SpectreRF simulations and taped out practically through CIC.
Subjects
射頻混頻器
直流電壓位準偏移
直接降頻
相位偏移電路
主動混頻器
金氧半混頻器
sub-harmonic mixing
CMOS mixer
dc offset
active mixer
direct conversion
phase shifter
RF mixer
Type
thesis
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