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2023•Unpublished venueRequires access

A High Isolation Linear Subharmonic Mixer for Q-Band Application

Gaurav Prakash Srivastava, Darshak Bhatt

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Abstract

An mm-wave sub-harmonic mixer using double- balanced Gilbert-cell topology in a stacked configuration is presented. The circuit applies source degenerate configuration for LO(local oscillator) input and RF (radio frequency) input in order to attain high linearity. The proposed mixer uses a switch transconductance(Sw-Gm) configuration to reduce noise Figure (NF) and obtain frequency doubling. It also helps in achieving high isolation between 2LO-to-RF (local oscillator input to radio frequency input). The proposed mixer attains more than 6 dB of conversion gain, IIP3 (third-order intercept point) of 7.94 dBm, and less than −14 dB of S11 for 40 GHz RF frequency with isolation between 2LO-to-RF of 120 dB.

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What this paper is about

An mm-wave sub-harmonic mixer using double- balanced Gilbert-cell topology in a stacked configuration is presented. The circuit applies source degenerate configuration for LO(local oscillator) input and RF (radio frequency) input in order to attain high linearity. The proposed mixer uses a switch transconductance(Sw-Gm) configuration to reduce noise Figure (NF) and obtain frequency doubling. It also helps in achieving high isolation between 2LO-to-RF (local oscillator input to radio frequency input). The proposed mixer attains more than 6 dB of conversion gain, IIP3 (third-order intercept point) of 7.94 dBm, and less than −14 dB of S11 for 40 GHz RF frequency with isolation between 2LO-to-RF of 120 dB.

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Available abstract

An mm-wave sub-harmonic mixer using double- balanced Gilbert-cell topology in a stacked configuration is presented. The circuit applies source degenerate configuration for LO(local oscillator) input and RF (radio frequency) input in order to attain high linearity. The proposed mixer uses a switch transconductance(Sw-Gm) configuration to reduce noise Figure (NF) and obtain frequency doubling. It also helps in achieving high isolation between 2LO-to-RF (local oscillator input to radio frequency input). The proposed mixer attains more than 6 dB of conversion gain, IIP3 (third-order intercept point) of 7.94 dBm, and less than −14 dB of S11 for 40 GHz RF frequency with isolation between 2LO-to-RF of 120 dB.

Key concepts: Harmonic mixer, Local oscillator, Intermediate frequency, Frequency mixer, Radio frequency, Transconductance, Gilbert cell, Noise figure

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