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2020•International Journal of RF and Microwave Computer-Aided EngineeringRequires access

A low conversion loss single balanced subharmonic mixer

Sadhana Kumari, Priyanka Mondal

Open publisher page 6 citations

Abstract

A new circuit topology for the design of a single balanced second-order subharmonic mixer (SHM) is proposed. In the proposed topology, it is not necessary for the radio frequency (RF) and local oscillator (LO) signal to be within 15% frequency difference. Thus, the limitation of a conventional rat-race mixer has been alleviated. Moreover, it shows very low conversion loss, high LO-to-RF, LO to intermediate frequency (IF), and 2LO-to-RF port isolations. The measured minimum down conversion loss is 5.8 dB at 13 GHz and remains below 7.65 dB over the 2 GHz RF operational band 12-14 GHz for a fixed IF of 550 MHz. Measured LO-to-RF and LO-to-IF port isolations are better than −40 dB over the entire operational band. The 2LO-to-RF isolation is more than −62 dB which is extremely necessary for a second harmonic mixer where 2LO and RF frequency are close to each other. The input 1-dB compression point is measured to be −1 dBm.

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What this paper is about

A new circuit topology for the design of a single balanced second-order subharmonic mixer (SHM) is proposed. In the proposed topology, it is not necessary for the radio frequency (RF) and local oscillator (LO) signal to be within 15% frequency difference. Thus, the limitation of a conventional rat-race mixer has been alleviated. Moreover, it shows very low conversion loss, high LO-to-RF, LO to intermediate frequency (IF), and 2LO-to-RF port isolations. The measured minimum down conversion loss is 5.8 dB at 13 GHz and remains below 7.65 dB over the 2 GHz RF operational band 12-14 GHz for a fixed IF of 550 MHz. Measured LO-to-RF and LO-to-IF port isolations are better than −40 dB over the entire operational band. The 2LO-to-RF isolation is more than −62 dB which is extremely necessary for a second harmonic mixer where 2LO and RF frequency are close to each other. The input 1-dB compression point is measured to be −1 dBm.

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Available abstract

A new circuit topology for the design of a single balanced second-order subharmonic mixer (SHM) is proposed. In the proposed topology, it is not necessary for the radio frequency (RF) and local oscillator (LO) signal to be within 15% frequency difference. Thus, the limitation of a conventional rat-race mixer has been alleviated. Moreover, it shows very low conversion loss, high LO-to-RF, LO to intermediate frequency (IF), and 2LO-to-RF port isolations. The measured minimum down conversion loss is 5.8 dB at 13 GHz and remains below 7.65 dB over the 2 GHz RF operational band 12-14 GHz for a fixed IF of 550 MHz. Measured LO-to-RF and LO-to-IF port isolations are better than −40 dB over the entire operational band. The 2LO-to-RF isolation is more than −62 dB which is extremely necessary for a second harmonic mixer where 2LO and RF frequency are close to each other. The input 1-dB compression point is measured to be −1 dBm.

Key concepts: Harmonic mixer, Intermediate frequency, Local oscillator, Radio frequency, Port (circuit theory), Electrical engineering, Physics, Subharmonic

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