Shunt-series and series-shunt inductively peaked clock buffer, and asymmetric multiplexer and de-multiplexer

Abstract

A clock buffer that uses low-to-medium quality factor (e.g., QF of 2 to 5) inductors in shunt-series and in series-shunt configuration in high-speed clock distribution stages. Shunt-series and series-shunt inductors extend amplifier bandwidth. Applying shunt-series and series-shunt inductors to high-speed clock distribution filters jitter, attenuates supply noise, and improves fanout. An asymmetric multiplexer with inductors in shunt or in shunt-series configurations. Another asymmetric multiplexer with capacitively coupled tri-stateable inverter-based buffer stages. These two multiplexer techniques along with the ability to 'hide' a load of a non-preferred path at a virtual ground node of the shunt inductor, the multiplexer improves the jitter and power consumption of the preferred path significantly. A de-multiplexer (DeMux) is also shown using inductors. A combination of a shunt-multiplexer and an inductor-based DeMux is also discussed.