MULTIPLYING_D_A_CONVERTER

Published:2009/7/6 3:40:00 Author:May | From:SeekIC

The circuit performs the function: VOUT = VIN × N/16 where N IS the binary number from 0 to 15 formed by the digital input If the analog input iS a fixed dc reference，the circuit 15 a conventional 4-bit D to ac signal，in which case the output is the product of the analog signal and the digital signal The circuit on the left is a programmable attenuator with weights of 0，1/4，1/2，or 3/4 The circult on the rightis a noninverUng adder， which adds weights to the first output of 0，1/16，1/8，or 3/16 If four quadrant multiplicatlon is required，place a phase selector circuit in series with either the analog input or output The Do input of that stage becomes the＋or-slgn bit of the atgttal input.



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