A 1-V 4-mW Differential-Folded Mixer with Common-Gate Transconductor Using Multiple Feedback Achieving 18.4-dB Conversion Gain, +12.5-dBm IIP3, and 8.5-dB NF
Document Type
Article
Publication Date
1-1-2020
Abstract
This article reports a novel differential-folded mixer with multiple-feedback techniques for performance enhancement. Specifically, we introduce the capacitor cross-coupled (CCC) common-gate (CG) transconductance stage to improve the noise figure (NF) at low power by boosting the effective transconductance, while enhancing the linearity via suppressing the second-order harmonic distortion. Typically, the created loop gain of the CCC can raise the third-order intermodulation (IM3) distortion, penalizing the input-referred third-order intercept point (IIP3). Here, we propose a positive and a second capacitive feedback into the CCC CG transconductor, not only to suppress the IM3 distortion current but also adds in design flexibility to the input transistors. Furthermore, the positive feedback also improves the input impedance matching, conversion gain, and NF through a flexible design criterion. Prototyped in a 0.13- μm process, the proposed mixer operating at 900 MHz dissipates 4 mW at 1 V. The measured double sideband (DSB) NF is 8.5 dB, the conversion gain ( GC ) is 18.4 dB and the IIP3 is +12.5 dBm. © 1993-2012 IEEE.
Keywords
Capacitive feedback, CMOS, high linearity, mixer, positive feedback, third-order intercept point (IIP3), third-order intermodulation (IM3) cancellation
Divisions
fac_eng
Publication Title
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
Volume
28
Issue
5
Publisher
Institute of Electrical and Electronics Engineers