Invention Grant
US08791845B2 Circuitry and method for reducing area and power of a pipelince ADC 有权
用于减少流水线ADC的面积和功率的电路和方法

Circuitry and method for reducing area and power of a pipelince ADC
Abstract:
A pipeline ADC (analog-to-digital converter) (14) includes a residue amplifier (7) for applying a first residue signal (Vres1) to a first input of a residue amplifier (11A) and to an input of a sub-ADC (8) for resolving a predetermined number (m) of bits and producing a redundancy bit in response to the first residue signal. A level-shifting MDAC (9A) converts the predetermined number of bits and the redundancy bit to an analog signal (10) on the a second input of the residue amplifier, which amplifies the difference between the first residue signal and the analog signal to generate a second residue signal (Vres2). The MDAC causes the residue amplifier to shift the second residue signal back within a predetermined voltage range (±Vref/2) by the end of the amplifying if the second residue signal is outside of the predetermined voltage range.
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