Circuit for multiplying an analog value by a digital value

摘要

A multiplication circuit directly multiplying an analog and a digital data without converting analog/digital or digital/analog converting. An analog input voltage is controlled by a switching signal of a digital voltage so as to generate an analog output or cut-off the outputs. Digital input signals b0 to b7 of a plural number of bits is integrated giving weights by means of a capacitive coupling, and a sign bit is added by a capacitive coupling CP with a double weight of the most significant bit ("MSB") of the digital input.