The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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The Design of A CMOS Gm-C Lowpass Filter with Variable Cutoff Frequency for Direct Conversion Receiver

직접변환 수신기용 가변 차단주파수특성을 갖는 CMOS Gm-C 저역통과필터 설계

  • 방준호 (전북대학교 공과대학 응용시스템공학부)
  • Published : 2008.08.01
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Abstract

A CMOS Gm-C filter with variable cutoff frequency applicable for using in the direct conversion receiver is designed. The designed filter comprises the CMOS differential transconductors, and the gm of the transconductor is controlled by the bias voltage. This configuration can compensate variant of the cutoff frequency which could be generated by external noises, and also be used in multiband receiver. As a results of HSPICE simulation, the control range of the cutoff frequency is $1.5MHz{\sim}3.5MHz$ and the gain control range is $-2.8dB{\sim}2.6dB$. The layout of the designed 5th-order Elliptic low-pass filter is performed to fabricate a chip using $2.5V-0.25{\mu}m$ CMOS processing parameter.

Keywords

References

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