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A 20-31 GHz HIGH IMAGE REJECTION RATIO SUBHARMONIC MIXER

Yi-Chang Lee, Chien-Hung Liu, Shih-Han Hung, Chun‐Chi Su, Yeong‐Her Wang

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Abstract

Abstract—A broadband monolithic image rejection subharmonic mixer using a standard 0.18µm CMOS technology is proposed. This circuit is composed of a band-pass filter with an intermediate frequency (IF) extraction function that can simplify the block diagram of the image rejection mixer. The entire passive circuit is constructed using a broadside coupling structure to achieve a high level of integration. Based on measured results, the proposed mixer exhibits conversion loss of 15.5–18.5 dB at a local oscillator (LO) power of 13 dBm, whereas the 3 dB bandwidth ranges from 20 to 31GHz (43.1%) with a miniature chip dimension of 0.77 × 0.81mm2. The LO-to-radio frequency (RF), 2LO-to-RF, and RF-to-IF isolation levels are higher than 22.5, 42.9, and 34.5 dB, respectively. The best image rejection ratio of 29 dBc with 20 ◦ phase compensation at 24.5GHz can be achieved. 1.

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What this paper is about

Abstract—A broadband monolithic image rejection subharmonic mixer using a standard 0.18µm CMOS technology is proposed. This circuit is composed of a band-pass filter with an intermediate frequency (IF) extraction function that can simplify the block diagram of the image rejection mixer. The entire passive circuit is constructed using a broadside coupling structure to achieve a high level of integration. Based on measured results, the proposed mixer exhibits conversion loss of 15.5–18.5 dB at a local oscillator (LO) power of 13 dBm, whereas the 3 dB bandwidth ranges from 20 to 31GHz (43.1%) with a miniature chip dimension of 0.77 × 0.81mm2. The LO-to-radio frequency (RF), 2LO-to-RF, and RF-to-IF isolation levels are higher than 22.5, 42.9, and 34.5 dB, respectively. The best image rejection ratio of 29 dBc with 20 ◦ phase compensation at 24.5GHz can be achieved. 1.

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Available abstract

Abstract—A broadband monolithic image rejection subharmonic mixer using a standard 0.18µm CMOS technology is proposed. This circuit is composed of a band-pass filter with an intermediate frequency (IF) extraction function that can simplify the block diagram of the image rejection mixer. The entire passive circuit is constructed using a broadside coupling structure to achieve a high level of integration. Based on measured results, the proposed mixer exhibits conversion loss of 15.5–18.5 dB at a local oscillator (LO) power of 13 dBm, whereas the 3 dB bandwidth ranges from 20 to 31GHz (43.1%) with a miniature chip dimension of 0.77 × 0.81mm2. The LO-to-radio frequency (RF), 2LO-to-RF, and RF-to-IF isolation levels are higher than 22.5, 42.9, and 34.5 dB, respectively. The best image rejection ratio of 29 dBc with 20 ◦ phase compensation at 24.5GHz can be achieved. 1.

Key concepts: Subharmonic, Image response, Harmonic mixer, Image (mathematics), Materials science, Physics, Electrical engineering, Computer science

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