The input resistance of a commonly-used amplifier is so large that the distributed capacitance is very harmful. An approach to minimize the influence of distributed capacitance is proposed and the concept of quasi-null-resistance amplifiers is introduced.The quasi-null-resistance amplifier and the commonly-used high resistance voltage amplifier are mated

their characteristics

applications

circuit configurations

advantages and defects correspond to each other. The new circuit can perform amplification of various signals. It has the advantages of minimizing the influence of the distributed capacitance and improving the frequency characteristics. When the amplifier is applied to the transmission of the measurement signals over a long distance

the attenuation and distortion caused by distributed parameters of leads can be eliminated. When it acts as a wide-band amplifier

the influence of the input and output capacitance of an a mplifier is decreased

therefore the bandwidth can be greatly increased. When the amplifier is used.in the input circuit

the input capacitance can be reduced from tens of pF to 1pF.