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An accurate center frequency tuning scheme for 450-KHz CMOS Gm -C bandpass filters

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3 Author(s)
Yamazaki, H. ; Fujitsu Labs. Ltd., Kawasaki, Japan ; Oishi, K. ; Gotoh, K.

This paper describes a center frequency tuning technique for a second intermediate-frequency (IF) bandpass filter. The utilization of the step signal response ensures the direct measurement of the center frequency. This tuning technique guarantees the accuracy of the design. A 450-kHz Gm-C bandpass filter tuned using this technique has been developed to integrate the IF module for personal digital cellular (PDC) handsets for use in 0.35-μm CMOS. The filter with the tuning scheme achieves a center frequency accuracy of ±0.5%

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:34 ,  Issue: 12 )