Patent ID: 8749423
Filing Date: 2014-06-10
Classification: H03F,H03M

Abstract:
1. An analog to digital converting device, comprising: a first digital conversion (ADC) circuit configured to receive an analog signal and convert a part of the analog signal into a first digital signal having a first predetermined number of bits; a first multiplying digital to analog converting (MDAC) circuit configured to amplify a difference between a first converted signal converted as an analog value from the first digital signal and the analog signal; a second ADC circuit configured to convert a signal amplified by the first MDAC circuit into a second digital signal having a second predetermined number of bits; a second MDAC circuit configured to amplify a difference between a second converted signal converted as an analog value from the second digital signal and the signal outputted from the first MDAC circuit; a third ADC circuit configured to convert a signal amplified by the second MDAC circuit into a third digital signal having a third predetermined number of bits; and a common amplifying circuit shared by the first MDAC circuit and the second MDAC circuit, wherein the common amplifying circuit consumes a different amount of current according to which MDAC circuit the common amplifying circuit operates with.