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Transformer-feedback interstage bandwidth enhancement for MMIC multistage amplifiers

Nikandish, G ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/TMTT.2014.2383400
  3. Abstract:
  4. The transformer-feedback (TRFB) interstage bandwidth enhancement technique for broadband multistage amplifiers is presented. Theory of the TRFB bandwidth enhancement and the design conditions for maximum bandwidth, maximally flat gain, and maximally flat group delay are provided. It is shown that the TRFB bandwidth enhancement can provide higher bandwidth compared to the conventional techniques based on reactive impedance matching networks. A three-stage low-noise amplifier (LNA) monolithic microwave integrated circuit with the TRFB between its consecutive stages is designed and implemented in a 0.1-μ m GaAs pHEMT process. The TRFB is realized by coupling between the drain bias lines of transistors. The reuse of bias lines leads to bandwidth enhancement without increasing the chip area and power consumption. The LNA features average gain of 23 dB and 3-dB bandwidth of 11-39 GHz. It provides a noise figure of 2.1-3.0 dB and an output 1-dB compression point of 8.6 dBm, while consuming 40 mA of current from a 2-V supply
  5. Keywords:
  6. Broadband amplifier ; Low-noise amplifier (LNA) ; Transformer feedback (TRFB) ; Amplifiers (electronic) ; Bandwidth ; Broadband amplifiers ; Feedback amplifiers ; Group delay ; Impedance matching (electric) ; Integrated circuits ; Low noise amplifiers ; Microwave amplifiers ; Microwave integrated circuits ; Noise figure ; Telecommunication networks ; 1dB compression point ; Bandwidth enhancement ; Conventional techniques ; Gaas phemt process ; Monolithic microwave integrated circuits (MMIC) ; Multi-stage amplifiers ; Reactive impedance ; Transformer feedback ; Monolithic microwave integrated circuits
  7. Source: IEEE Transactions on Microwave Theory and Techniques ; Volume 63, Issue 2 , 2015 , Pages 441-448 ; 00189480 (ISSN)
  8. URL: http://ieeexplore.ieee.org/document/7000570