DIGITAL-TO-ANALOGUE CONVERTER Russian patent published in 2024 - IPC H03M1/06 H03M1/76 

FIELD: analogue-digital equipment.

SUBSTANCE: invention can be used in devices for converting digital values—codes into proportional analog values. Digital-to-analogue converter contains N−1 bitwise weighted resistors with resistance range R, R, 2R, 4R, ..., 2^N−3R, where N is the digit capacity of the DAC, N switching keys controlled by the input digital binary code A_NA_N−1...A₁, where A_N is the most significant bit of the N-bit DAC and a multidifferential operational amplifier with N−1 input differential stages. Reference voltage E₀ is connected to ends of resistive divider, wherein connection at least resistance R is grounded. Inverting input of the first differential stage of the multidifferential operational amplifier forms a unit feedback with its output. All non-inverting inputs of multidifferential operational amplifier are connected through switches to units connected in series, in the form of a resistive voltage divider, bitwise weighted resistors. Inverting inputs of the multidifferential operational amplifier from the second to N−3 differential cascade are grounded, inverting inputs of N−2 and N−1 differential cascades are combined and connected to the input of the N-th switch connected directly to the reference voltage source. Second outputs of all switches are connected to a common grounded bus.

EFFECT: reducing the upper range of nominal values of weighted resistors for the implementation of a higher-bit digital-to-analogue converter (DAC), as well as the possibility of inverting the output voltage of the device to obtain a bipolar voltage at the output of the device with one polarity of the reference voltage.

1 cl, 4 dwg