Transformer-Feedback Interstage Bandwidth Enhancement for MMIC Multistage Amplifiers

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- μm 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.

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