Current tunable CMOS operational transresistance amplifier

A new signal power amplifier is presented in this paper. The proposed circuit consists of the new design of transresistance amplifier cell connecting with the common source negative feedback and the output driver circuit. The input and output impedance of the circuit is low because the negative feedback and output driver circuit are used. The voltage buffer is used for the output driver circuit. The new transresistance amplifier is found to have a constant bandwidth independent of gain in most close-loop configurations. The feedback network in particular increases bandwidth and enhances the linearity of the transresistance amplifier. The biasing current of this shunt-shunt common source negative feedback can also tune the gain of the close-loop circuit configuration. In this work an experimental result has shown the fundamental transresistance amplifier by use of commercial integrated circuits compared to the simulation result. This confirms that the new design of transresistance amplifier is useable