A Design of Bipolar Transresistance Amplifiers

바이폴라 트랜스레지스턴스 증폭기 설계

  • 차형우 (청주대학교 전자·정보통신·반도체공학부) ;
  • 임동빈 (청주대학교 전자공학과) ;
  • 송창훈 (청주대학교 전자공학과)
  • Published : 2001.11.01


Novel bipolar transresistance amplifier(TRA) and its offset-compensated TRA for high-performance current-mode signal processing are described. The TRA consist of two current follower for a current inputs, a current summer for the current-difference, a resistor for the current to voltage converter, and a voltage follower for the voltage output. The offset-compensated TRA adopts diode-connected npn and pnp transistor to reduce offset voltage in the TRA. The simulation results show that the TRA has impedance of 0.5 Ω at the input and the output terminal. The offset voltages at these terminals is 40 mV The offset-compensated TRA has the offset voltage of 1.1 mV and the impedance of 0.25 Ω. The 3-dB cutoff frequency is 40 MHz for the two TRA's when used as a current to voltage converter with unit-gain transresistance. The power dissipation is 11.25 mW.



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