Abstract:An active recursive filter using HEMT technology is proposed in the following article. An ED02AH HEMT technology with advanced design system (ADS 2010) was used to design a test circuit. This kind of filter appeared feasible in simulations, and reasonably practically good performance was achieved. Gain and Q-value were capable to be tuned within a wide range. A center frequency was 4GHz for which S21=20.134dB, S11=-15dB and S22=-21.2dB. Simulations demonstrate a center frequency tuning range of 1.5GHz to 6GHz.
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