Experimental Analysis of the Variants of UBCT Amplifier Circuit

The Unipolar-Bipolar Composite Transistor (UBCT) circuit is designed to combine the advantages of high input resistance of unipolar transistor and transfer curve linearity of bipolar transistor. The Composite Circuit has been designed with n-channel JFET, npn BJT and a pair of resistors, therefore this type of JFET-BJT composite transistor is classified as UBCT. This UBCT circuit exhibits enhanced static and dynamic performances as compared to that of JFET. In the present correspondence, the performances of the variants of the UBCT amplifier circuit have been experimentally analysed on the basis of power dissipation level and the corresponding voltage gain of the amplifier. According to the experimental results, the UBCT amplifier circuit can be used as a power efficient small signal amplifier for analog applications.