Promising transistor results of an InP transferred substrate (TS) technology are presented. ftand fmaxare reported as high as 420 and 450 GHz, respectively. Processing has been developed to a full monolithic microwave integrated circuit compatible technology with metal-insulator-metal capacitors, NiCr resistors, and a multilevel wiring scheme. As an example, traveling-wave amplifiers (TWAs) have been designed and realized in a microstrip environment. Simulations of the environment have been done, and are presented in this paper. They have then been used as a design kit to perform circuit simulations. The TWAs demonstrate a gain of 12.8 dB and a 3-dB cutoff frequency fcof 70 GHz. To the authors' knowledge, this is the highest proven bandwidth of a broadband amplifier in TS technology.
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Kraemer et al. (2009) studied this question.
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