Patent ID: 7429945
Filing Date: 2008-09-30
Classification: H03M

Abstract:
1. An analog to digital converter, comprising: a reference voltage generating circuit to generate a plurality of first reference voltages, and to generate a plurality of second of reference voltages based on a first control signal; a first bank of comparators receiving the first reference voltages and storing a first input signal, based on the first reference voltages and the first input signal to generate a first comparison code and a first control signal at a first period, and receiving the second reference voltages, based on the second reference voltages and the first input signal to generate a second comparison code at a second period; a first bank of encoders receiving the first comparison code and the second comparison code to output a first digital code; a second bank of comparators receiving the first reference voltages and storing a second input signal, based on the first reference voltages and the second input signal to generate a third comparison code and a second control signal at a second period, and receiving a plurality of third reference voltages, based on the third reference voltages and the second input signal to generate a fourth comparison code at a third period, wherein the reference voltage generating circuit generates the third reference voltages based on the second control signal; and a second encoder receiving the third comparison code and the fourth comparison code to output a second digital code.