Patent ID: 7973553
Filing Date: 2011-07-05
Classification: G11C,H04L

Abstract:
1. A circuit comprising: first transistors; a first comparator operable to compare a first reference signal and a signal that is based on conductive states of the first transistors to generate an output signal; a first control circuit operable to generate first control signals based on the output signal of the first comparator, wherein the conductive states of the first transistors are determined based on the first control signals; storage circuits operable to store second control signals based on the first control finals; a calibration circuit comprising second transistors, wherein conductive states of the second transistors are determined based on the second control signals, and wherein the calibration circuit is operable to generate third control signals; and a buffer operable to control a termination impedance at a first external terminal of the circuit based on the second and the third control signals.