An improved mixer with high-precision automatic sweet-spot biasing and active-inductor-based harmonic suppression

A 930MHz Gilbert mixer with improved linearity and noise figure is presented. To achieve high linearity, the transconductance stage is biased at the sweet spot by a high-precision automatic optimum biasing circuit; and an active-inductor-based series LC network resonating around twice the signal fre...

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Bibliographic Details
Main Authors: Song Hu, Yumei Huang, Zhiliang Hong
Format: Conference Proceeding
Language:English
Subjects:
active inductor
Active inductors
Gilbert mixer
harmonic
Harmonics suppression
high precision
Linearity
Mixers
Noise
sweet spot
Transconductance
Transistors
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Description
Summary:A 930MHz Gilbert mixer with improved linearity and noise figure is presented. To achieve high linearity, the transconductance stage is biased at the sweet spot by a high-precision automatic optimum biasing circuit; and an active-inductor-based series LC network resonating around twice the signal frequency is implemented at the common source nodes of the switch quad to alleviate the second-order interaction effect. The adoption of the active inductor makes this work compact and robust. Noise performance also benefits from the harmonic suppression network. Measurement results show that, the proposed mixer achieves an IIP3 of 12.4dBm and a DSB noise figure of 11.5dB, with a current consumption of 6.7mA from a 1.2V power supply.
DOI:10.1109/RFIT.2011.6141769