A low power direct conversion receiver RF front-end with high in-band IIP2/IIP3 and low 1/f noise |
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Authors: | Baoyong Chi Shuguang Han Zhihua Wang |
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Affiliation: | (1) Institute of Microelectronics, Tsinghua University, Beijing, 100084, China;(2) Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China |
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Abstract: | A low power direct-conversion receiver RF front-end with high in-band IIP2/IIP3 and low 1/f noise is presented. The front-end
includes the differential low noise amplifier, the down-conversion mixer, the LO buffer, the IF buffer and the bandgap reference.
A modified common source topology is used as the input stages of the down-conversion mixer (and the LNA) to improve IIP2 of
the receiver RF front-end while maintaining high IIP3. A shunt LC network is inserted into the common-source node of the switching
pairs in the down-conversion mixer to absorb the parasitic capacitance and thus improve IIP2 and lower down the 1/f noise
of the down-conversion mixer. The direct-conversion receiver RF front-end has been implemented in 0.18 μm CMOS process. The
measured results show that the 2 GHz receiver RF front-end achieves +33 dBm in-band IIP2, 21 dB power gain, 6.2 dB NF and
−2.3 dBm in-band IIP3 while only drawing 6.7 mA current from a 1.8 V power supply. |
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