A Design Of 3-Millimeter Wave Oscillator

Millimeter-wave oscillator is the basic components of millimeter-wave systems such as radar, communication system, and electronics rivalry. It turns DC power into RF power. Recent years, tri-terminal devices develop fast, compared with bi-terminal devices, they have more advantages: much higher working frequency; more efficient, steadier and higher level of integration, etc. An oscillator fabricated on PHEMT or HBT is even better at noise reduction, higher dynamic range, working frequency and level of integration. ALL solid-state device oscillator has been migrating to tri-terminal device technology.Based on the successful taping-out of single transistor on InP ( 220GHz threshold frequency), this paper proposes a design of oscillating circuit on InP with PHEMT active devices, including simulation results and layout. The circuit uses a negative-resistance oscillator, and common-source topology comprising a simple T type structure as feedback path. This paper uses parallel connection harmonic oscillating as analyzing method, makes the oscillator start to oscillate at the central frequency. Use coplanar waveguides as transmission lines. Optimize the circuit according to the active devices small-signal S parameter, the starting-state and the balance of oscillating.The oscillator proposed in this paper achieved oscillating at the single frequency of 94 GHz.