Narrow-band MMIC filters with automatic tuning and Q-factor control

Narrowband, active monolithic-microwave-integrated-circuit (MMIC) filters at X-band are discussed. Results for both bandpass and notch circuits fabricated using standard GaAs MESFET processes are presented. A novel master-slave control circuit provides compensation for fluctuations in the fabrication process and operating temperature, and it enables the filter to accurately track a reference signal.<
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