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Design and Analysis of Broadband Darlington Amplifiers With Bandwidth Enhancement in GaAs pHEMT Technology

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2 Author(s)
Nikandish, G. ; Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran ; Medi, A.

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.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:62 ,  Issue: 8 )