Patent ID: 7345615
Filing Date: 2008-03-18
Classification: H03M,H04N

Abstract:
1. An A/D conversion array comprising arrayed unit circuits, each of which comprises: a first circuit element arranged to perform A/D conversion of multiple bits per cycle; a second circuit element arranged to convert a digital output of said first circuit element to a resulting analog conversion signal by first switching means, and a first capacitor; amplification means arranged to amplify an analog input, the amplification means comprising a second capacitor for determining gain from a ratio of capacitance of the second capacitor and said first capacitor, the second capacitor being connectable between an input and an output of an inverting amplifier to subtract the analog conversion signal from the analog input; a third circuit element arranged to sample and hold an output of said amplification means by second switching means and said first capacitor; and third switching means arranged to select one of the output of said amplification means and an input signal and to supply the selected signal to said amplification means as input, via said first capacitor, the A/D conversion array being characterized in that: control means arranged to control said first to third switching means is installed outside the array, and the arrayed unit circuits are arranged such that cyclic multi-bit A/D conversion is performed when the input signal is supplied as an input of said amplification means in a first stage, and a signal from said third circuit element is supplied to the input of said amplification means in a next stage.