ABSTRACT
In this chapter, the authors analyze in depth design of an oscillator topology to address the aforementioned constraints without sacrificing manufacturability and phase purity. They introduce and analyze a switching current-source oscillator, which is optimized for 28-nm CMOS, can operate directly at the low voltage of harvesters, and reduces power and supply voltage without compromising the robustness of the oscillator start-up or loading its tank quality factor. Consequently, single-ended capacitors suppress the common-mode oscillation voltage across the tank. In this instance, the upper pair is more appropriately viewed as a voltage-biased circuit. The authors describe and analyze a switching current-source oscillator by providing deep insights into beneficial circuit operation. It combines advantages of low supply voltage operation of the conventional NMOS cross-coupled oscillator with high current efficiency of the complementary push–pull oscillator to reduce the oscillator supply voltage and dissipated power without sacrificing its start-up robustness or loading tank’s Q-factor.
