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One of the classic problems of instrumentation is the comparison of alternating voltage amplitudes [1]-[4]. Inductive voltage dividers (IVDs) are usually used for precision AC [5][11]ratio measurements. To calibrate IVD ratio KIVD errors, the calibrated IVD referencing method is the most widely used [12], [13]. For example, this method is used in the National Institute of Standards and Technology (NIST, USA) to calibrate decade IVDs (54120С – 54131С services) in the range of 50 Hz to 20000 Hz [14]. In the calibration process, an IVD ratio is compared with a ratio from a reference IVD using the differential method of measurement. Comparisons of two AC voltages vx(t) and v0(t) with the same frequency ω lock-in amplifiers with a differential input (LIADI) are usually applied. [15], [16]. LIADI defines the measurement precision and permits the separation of a low differential signal from a high common-mode interfering signal. А block diagram of a measuring IVD ratio error using the LIADI system is shown in Figure 1. Figure 2 shows a block diagram of a simple LIADI. According to the scheme, the amplitudes of in-phase signals vx(t) and v0(t) are compared, the signal is then amplified and the signal difference detected. Lock-in amplifiers are mainly used in physical and chemical sensing applications [17]-[26]. However, LIADI inputs are also used for calibration measurement instruments [15], [16], [27]. Equation (1) below defines the output voltage of simple LIADI (Figure 2):

Lock-in amplifier with a high common-mode rejection ratio in the range of 0.02 to 100 kHz