High-precision low-voltage voltage/current switching circuit
A technology of voltage-current conversion and voltage-following circuit, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, electrical components, etc. It can solve the problems of inaccurate restoration of output voltage and low mirror image precision, and achieve The effect of good output current matching, low working voltage and strong suppression ability
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[0028] Figure 4 It is a schematic diagram of a PMOS voltage-to-current conversion circuit. Figure 4 Among them, the PMOS transistors M1, M2, and M3 form a current mirror and are connected to the input voltage VIN. The reference voltage source generates a reference voltage VREF, and inputs the reference voltage VREF as an input signal to the inverting terminal of the error amplifier EA, and the output terminal of the error amplifier EA drives the current mirror to generate mirror currents and output them respectively. The voltage follower circuit includes a first branch, a second branch and a third branch. The first end (point A) of the first branch is connected to the drain of M1, and the first end (point B) of the second branch is connected to the drain of M1. The drain of M2 is connected, and the first end (point C) of the third branch is connected to the drain of M3; and the voltage follower circuit is used to make the drain voltage of M2 and the drain voltage of M3 conn...
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