Floating power differential amplifier. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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The useful input signal of the differential amplifier to the op-amp DA1 and DA2 is the voltage difference Uin + and Uin-. The difficulty lies in the fact that there is a significant common-mode component (Uin + + Uin-) / 2, which exceeds the allowable for LTC1050 series op-amps - low-noise and with reduced zero drift, but relatively low-voltage. The problem is solved by using "floating" power supply of these op-amps.
Voltage sources +2,5 V and -2,5 V are built on current stabilizers (transistors VT1, VT3 and VT2, VT4) and integral parallel stabilizers DA4 and DA5. The common-mode component of the signal, selected with the help of resistors R4 and R5, is fed through the repeater to the op-amp DA3 at the common point of these sources, maintaining the power supply symmetrical with respect to the common-mode component.
Capacitor C1 not only filters noise, but also inevitably introduces a delay in the compensation circuit. As a result, the change in supply voltages lags behind changes in the common-mode component and short-term violations of compensation are possible. Therefore, the solution under consideration is only suitable for very low frequency signal amplifiers.
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