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Journal of the Korean Institute of Electromagnetic and Science 2002;2(1):56-58.
A New Compact Double Conversion Gate Mixer using a Half-LO Frequency
Jae-Ryong Lee, Sang-Won Yun
Dept. of Electronics Engineering, Sogang University
Abstract
In this paper, the double conversion gate mixer using a half-LO frequency is described at 25 GHz band. The proposed mixer uses two HEMTs excited by a single LO signal of half-LO frequency in order to generate the second IF signal. That is, the LO signal having the half-LO frequency is only fed into the gate of the first HEMT mixer as a normal gate mixer. The LO signal through the first mixer is find into the second mixer The proposed miler requires not only half of the normal LO frequency, but also lower LO power than the conventional subharmonically pumped milers. Over the bandwidth of 500 MHz at 24.5 GHz, the conversion gain is 2.5 dB, the noise figure is 9 dB, and the isolation between RF and LO port is 32 dB when the LO poller is 0 dBm at 12.65 GHz.
Key words: double conversion gate mixer, sub-harmonic mixer.
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