Patent ID: 8134548
Filing Date: 2012-03-13
Classification: G01R,H02M

Abstract:
1. An apparatus, comprising: a) a switching transistor; b) a pair of transistors having their conductive channels coupled in series, a drain of one of said pair of transistors coupled to one end of said switching transistor's conductive channel, a source of the other of said pair of transistors coupled to the other end of said switching transistor's conductive channel, and a source of the one of said pair of transistors coupled in series to a drain of the other of said pair of transistors; and, c) a node between said pair of transistors coupled to an input of an amplifier; and d) a second pair of transistors having their conductive channels coupled in parallel, a node between said second pair of transistors coupled to a reference input of said amplifier, wherein a transistor of said first pair of transistors is designed to be matched to a transistor of said second pair of transistors.