This paper presents a bandwidth enhancement technique for broadband Darlington amplifiers. A detailed analysis of the high-frequency performance of the Darlington amplifier and the effect of bandwidth enhancement is provided. A design procedure is also given for broadband feedback Darlington amplifiers with bandwidth enhancement and gain flattening. A single- and a three-stage feedback amplifier with the proposed improvements are designed and implemented in a 0.25- μm AlGaAs-InGaAs pHEMT technology. The single-stage amplifier provides 6±0.4 dB of small-signal gain in the frequency band of 1-30 GHz. The three-stage amplifier features 17.8±0.8 dB of small-signal gain in the frequency band of 2-29 GHz. It provides a gain-bandwidth product of 217 GHz, which is 3.3 times larger than the unity gain frequency (fT) of the process.
No takes yet. Share an insight, caveat, or question.
Nikandish et al. (2014) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: