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Long-Term HIV Dynamics: Mathematical Modeling and Optimal Control

A first differential amplifier amplifies the differential signal component of the input signal supplied to input terminals. The differential component is then supplied to output terminals. The first differential amplifier comprises a first differential pair of transistors for producing a differential output current proportional to the input signal, and two load impedance elements connected to the outputs of the transistors of the first differential pair, for converting the output current to a voltage output. A current source is coupled to both load impedance elements. The in-phase component provided at the output terminals is detected by a detector circuit. A second differential amplifier detects the difference between the in-phase component and a reference value. This difference changes the output current of the current source, thereby controlling the in-phase component.