SELECTIVE AMPLIFIER FOR PRECISION ANALOGUE-TO-DIGITAL INTERFACE Russian patent published in 2013 - IPC H03F3/45 

FIELD: radio engineering, communication.

SUBSTANCE: instrumentation amplifier for a precision analogue-to-digital interface has an input precision converter of first and second sources of input voltage with first and second anti-phase outputs, an active adder, the inverting input of which is connected to the first output of the input precision converter, and the non-inverting input is connected to the second output of the input precision converter, the output of the device is connected to the output of the active adder, wherein the first and second sources of input voltage are connected to inputs of the input precision converter relative the common bus of the power supply, the active adder has first and second voltage-to-current converters and a first output current-to-voltage converter.

EFFECT: improved amplitude characteristics of output signals and obtaining maximum coefficient of attenuation of the input in-phase voltage.

3 cl, 13 dwg