Patent ID: 9397682
Filing Date: 2016-07-19
CPC Classification: H03F,H03K,H03M

Claim Text:
1. A programmable reference buffer comprising: a stacked source follower comprising a first transistor and a second transistor in a common drain configuration; a pass device separating the first transistor and a second transistor, wherein the pass device comprises selectable diode-connected transistors and switches corresponding to the selectable diode-connected transistors, wherein each switch is connected between a gate of a corresponding selectable diode-connected transistor and a drain of the corresponding selectable diode-connected transistor; and a controller having output control signals for controlling the switches to select one or more ones of the selectable diode-connected transistors to be used as part of the pass device based on a reference voltage to be provided at a first terminal and a second terminal of the pass device.