Patent ID: 7994846
Filing Date: 2011-08-09
Classification: G05F

Abstract:
1. A current reference branch circuit, comprising: a main reference branch sub-circuit operative to supply a second reference voltage to current source branches, said main reference branch circuit comprising a transistor having a body terminal; and a replica reference branch sub-circuit operative to replicate said main reference branch sub-circuit, said replica reference branch sub-circuit comprising a load resistance operative to generate a first reference voltage in response to current variations through said load resistance; and an amplifier operative to receive a DC reference voltage at an inverting input and said first reference voltage at a non-inverting input, whereby said amplifier is operative to track the current variations through said load resistance caused by variations in process threshold voltage and to modify a body voltage applied to said body terminal in response thereto which functions to compensate for said process threshold variations, thereby minimizing output voltage variation of said main reference branch sub-circuit.