SEMICONDUCTOR CIRCUIT FOR DIGITAL-ANALOG CONVERSION AND IMPEDANCE CONVERSION
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Mar 20, 2017
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Mar 23, 2016
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Abstract
A semiconductor circuit includes first and second DA converters which selects first and second reference voltages in response to upper m bits of input digital data, a select circuitry which outputs first to N-th selected input voltages in response to lower n bits of the input digital data; first to N-th differential input stages, an output stage and a first tail current source. Each of the first to N-th differential input stages includes a transistor pair. The i-th selected input voltage is supplied to the gates of a first MISFET of the i-th differential input stage and the gates of the second MISFETs of the first to N-th differential input stages are connected to the output node. The first tail current source controls the current levels of the first tail current in the first to N-th differential input stages in response to lower n bits of the input digital data.
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