Oversampling a/d converter with two capacitor arrays

Details Oversampling a/d converter with two capacitor arrays Oversampling a/d converter with two capacitor arrays

H - Electricity

03

M

354/70

H03M 1/50 (2006.01) H03M 3/02 (2006.01)

Patent

CA 1301343

66446-457 ABSTRACT Disclosed is an oversampling A/D converter which com- prises two each of sample and hold circuits, subtracters and D/A converters. The two sample and hold circuits alternately sample and hold the input analog signal in a predetermined first period and generate first and second sampled signals. The two D/A converters convert first and second digital local signals into corresponding first and second analog local signals, respectively. The two subtracters determine the respective differences between the first and second sampled signals on the one hand and the first and second analog local signals on the other, and generate first and second difference signals. A selector alternately selects the first and second difference signals in a second period equal to half of the first predetermined period. An integrator inte- grates the output signal of the selector and generates an inte- grated signal. A quantizer quantizes the integrated signal and generates a quantized signal. A control logic circuit generates digital signals based on the quantized signal. A signal distribut- ing circuit distributes the digital signal alternately to the D/A converters in the second period as the first and second digital local signals. The present invention makes it possible to achieve about twice as fast operation as conventional oversampling A/D converters by providing and alternately operating two each of sample and hold circuits, subtracters and D/A converters.

570578

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