KIEE International Transactions on Electrophysics and Applications

The Korean Institute of Electrical Engineers (대한전기학회)
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Low Spurious Image Rejection Mixer for K-band Applications

  • Lee, Moon-Que (Department of Electrical and Computer Engineering, University of Seoul) ;
  • Ryu, Keun-Kwan (Department of Electrical and Computer Engineering, University of Seoul) ;
  • Kim, Hyeong-Seok (Department of Electrical and Computer Engineering, University of Seoul)
  • Published : 2004.12.01
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Abstract

A balanced single side-band (SSB) mixer employing a sub-harmonic configuration is designed for up and down conversions in K-band. The designed mixer uses anti-parallel diode (APD) pairs to effectively eliminate even harmonics of the local oscillator (LO) spurious signal. To reduce the odd harmonics of LO at the RF port, we employ a balanced configuration for LO. The fabricated chip shows 12$\pm$2dB of conversion loss and image-rejection ratio of about 20dB for down conversion at RF frequencies of 24-27.5GHz. As an up-conversion mode, the designed chip shows 12dB of conversion loss and image-rejection ratio of 20 ～ 25 dB at RF frequencies of 25 to 27GHz. The odd harmonics of the LO are measured below -37dBc.

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References

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