A 300-GHz Fundamental Oscillator in 65-nm CMOS Technology
Fundamental oscillators prove the existence of gain at high frequencies, revealing the speed limitations of other circuits in a given technology. This paper presents an oscillator topology that employs feedback from an output stage to the core, thus achieving a high speed. The behavior of the proposed oscillator is formulated and simulations are used to compare it with the conventional cross-coupled pair circuit. Three prototypes realized in 65nm CMOS technology operate at 205GHz, 240GHz and 300GHz, each drawing 3.7mW from a 0.8V supply.