Design of an active CMOS subharmonic mixer with enhanced transconductance |
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| Affiliation: | 1. 115 Department of Mathematics, Shahrekord University, Iran;2. 19395-5746 School of Mathematics, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran;1. Department of E & C Eng., National Institute of Technology Karnataka, Surathkal Mangaluru 575025, India;2. Department of Nanoscience and Engineering, Centre for Nano Manufacturing, Inje University, Gimhae 621-749, Republic of Korea;1. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran;2. Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran |
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| Abstract: | This paper presents a wideband Gilbert subharmonic mixer (SHM) that partly overcomes the fundamental trade-off between radio frequency (RF) and intermediate frequency (IF) currents. Compared to the conventional SHM, the proposed SHM features large gain, low noise figure (NF) and moderate linearity over a wide bandwidth by concurrent usage of regulated-cascode RF-stage and inductive connection between RF and LO stages. Numerical analyses along with circuit-level simulations are given to evaluate the performance of the proposed mixer and facilitate its optimum design. Simulations using a 0.18 μm RF-CMOS process demonstrate that the proposed mixer, at a fixed IF of 100 MHz, exhibits more than 5 dB and 2 dB improvements in conversion gain (CG) and NF, respectively. |
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| Keywords: | CMOS UWB Subharmonic mixer (SHM) Flat gain Regulated-cascode Noise |
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