A modulation scheme in which the transmission path length of the mmwaoe signal is digitally modulated by means of a PIN diode switch has been proposed for the waveguide transmission system. To demonstrate the feasibility of this proposal, a complete transmitter has been developed in the 50 ~ 60-GHz range, consisting of an IMPATT oscillator, circulator, PIN diode switch, and its driver circuit. The model can handle signals at SOO Mb/s and deliver 100 mW of modulated power at the output. This paper describes the design considerations of each component in detail, together with the experimental results.
A GaAs integrated circuit has been designed and fabricated to regenerate digital data at gigabit per second rates. The circuit architecture is direct-coupled FET logic (DCFL), and the fabrication is by self-aligned etched gate on CVD epitaxial material. The circuit includes a moderate-gain input amplifier with threshold adjustment, a clocked D flip-flop for data sampling and storage, and an output buffer for driving low impedance transmission lines. Dynamic performance measurements include correct regeneration of pseudorandom data at 2.0 Gbit/s, the maximum allowed by available instrumentation, and l o l o . . . data at 2.4 Gbit/s. Rise/fall times below 150 ps into 50 Cl were observed. A minimum gate delay of 17.8 ps and a maximum toggle frequency of 3.8 GHz were measured with associated ring oscillator and binary frequency divider circuits, respectively.
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