Design of a BJT low-voltge low-frequency filter using current amplifier

전류증폭기를 이용한 BJT 저전압 저주파 필터 설계

  • 안정철 (한국전자통신연구원) ;
  • 최석우 (전북대학교 부속 전기전자회로합성연구소) ;
  • 윤창훈 (전북대학교 부속 전기전자회로합성연구소)
  • Published : 1998.05.01

Abstract

In this paper, a design of current-mode continuous-time filters for low voltage and low frequency applications using complementary bipolar current mirrors is presented. The proposed current-mode filters consist of simple bipolar current mirrors and capacitors and are quite suitable for monolithic integration. Since the design method of the proposed current-mode filters are based on the integrator type of realization, it can be used for a wide range of applications. Since the input impedance of simple bipolar current mirror is small, in this paper, negative feedback amplifier is used to realize is designed by cascade method. The cutoff frequency of the designed filter can be easily tunable by the DC controlling current from 60kHz to 120kHz. The characteristics of the designed current-mode filters are simulated and examined by SPICE using standard bipolar transistor parameters.

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