Journal of the Korean Institute of Telematics and Electronics C (전자공학회논문지C)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A ladder type 8th-order elliptic low-pass filter using transadmittance amplifiers

트랜스어드미턴스 증폭기를 이용한 사다리형 8차 일립틱 저역-통과 여파기

  • 김종필 (청주대학교 반도체공학과) ;
  • 박지만 (청주대학교 반도체공학과) ;
  • 정원섭 (청주대학교 반도체공학과)
  • Published : 1998.08.01
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Abstract

An 8th-order elliptic low-pass filter with cutoff frequency of 3.13kHz is presented. The design procedure is based on teh 1/s impedance transformation which is applied to a minimum capacitor LC ladder network.The tranformed network is implemented with resistors and high Q frequency-dependent negative resistors (FDNR's). The high Q FDNR is realized with two transadmittance amplifiers. Detailed SPICE simulations show that the iflter has pass-band ripple of 0.18dB, stop-band attenuation over 100dB, cutoff frequency of 3.13 khz, and cutoff frequency temperature coefficient of 8.5ppm/.deg. C at supply voltage of .+-.5V.

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