Gain Improvement of the Cascaded Single Stage Distributed Amplifier.

In this paper, a high gain cascaded single stage distributed amplifier design method is proposed. This new design method is based on the Chebyshev polynomial approximation of the amplifier transducer gain. By this approximation an improvement of 12 dB in gain, is obtained, compared with the conventional cascaded single stage distributed amplifier with a simplified unilateral single field effect transistor model. This 12 dB are obtained by eliminating two resistors which consume the power; but, by doing this, a mismatch is provoked in the circuit, so a loss of gain is obtained at high frequencies. By the use of the proposed method a stable gain is obtained from dc to the cut-off frequency of the circuit. In addition, a more compact circuit is obtained, by eliminating four components, compared with the cascaded single stage distributed amplifier. [ABSTRACT FROM AUTHOR]