Abstract
A semi-passive charge-sharing complex bandpass filter employing positive feedback technique is proposed to control bandwidth at different centre frequencies. In contrast to the previous arts, bandwidth can be changed independent of centre frequency without any rise in the number of clock phases and switches. Also, insightful continuous-time model and block diagram of the proposed filter have been presented. The results of simulation carried out with 0.18 µm CMOS technology at 200 MHz reference frequency for centre frequencies of 10 and 20 MHz and bandwidth of 1, 3 and 7 MHz indicate the filter's ability to control the quality factor excellently.
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