Tunable Active Dual-Band Bandpass Filter Design Using MMIC Technology
The inductor-less designing of monolithic tunable active dual-band bandpass filter is presented in this paper. Biasing voltages signify main role. The authors can control the center frequency and quality factor. Using four biasing voltages and cascading two similar filters lead to dual-band bandpass filter. By keeping the gain constant, the center frequency shift is 200 MHz. Regardless constant gain; quality factor can range from 60 to 180 at the center frequency. The proposed filter is designed using MMIC technology with the center frequency of 2GHz and the power consumption of 240 mW.