Charge Pump Voltage Detection Circuit for Accurate Memory Power

The patent replaces the traditional series resistor voltage divider circuit with a capacitive voltage divider circuit. Instead of using resistors that generate continuous current and cause voltage drops, the invention uses capacitors to perform voltage division. The first sampling circuit includes a first capacitor connected between the power voltage node and ground, and a second capacitor connected between the reference voltage node and ground. This substitution eliminates the harmful current flow through transmission traces while achieving the same voltage sampling function, thereby resolving the contradiction between measurement precision and energy loss.

The patent changes the fundamental parameter of the voltage division mechanism from resistive to capacitive. By using capacitors instead of resistors, the circuit operates based on capacitive reactance rather than resistance. The first sampling circuit uses a first capacitor and second capacitor in a capacitive voltage divider configuration, which provides voltage division without the continuous current flow that causes voltage drops in resistive circuits. This parameter change maintains ease of operation while significantly improving reliability by eliminating the source of voltage signal deviation.

The patent substitutes the resistive voltage division mechanism with a capacitive voltage division mechanism. The first sampling circuit employs capacitors (first capacitor and second capacitor) that perform voltage division without requiring continuous current flow through the transmission trace. This substitution eliminates the I²R losses that occur in resistive circuits, thereby preventing both energy loss and the associated voltage drops that degrade reference voltage signal accuracy. The capacitive approach maintains signal integrity while minimizing energy consumption.