Voltage source circuit for digital circuit

Abstract

The invention discloses a voltage source circuit for a digital circuit. The voltage source circuit comprises a current mirror, a PMOS transistor, an NMOS transistor and a low drop-out linear voltage regulator. The input end of the current mirror is connected with a power voltage, and the output end of the current mirror is connected with the source electrode of the PMOS transistor. The drain electrode of the PMOS transistor is connected with the drain electrode of the NMOS transistor, the grid electrode of the PMOS transistor is connected with the grid electrode and the drain electrode of the NMOS transistor respectively, and the source electrode of the NMOS transistor is connected to the ground. The input end of the low drop-out linear voltage regulator is connected to the source electrode of the PMOS transistor, and the output end of the low drop-out linear voltage regulator is connected to a digital circuit module. The voltage source circuit for the digital circuit improves an existing voltage source circuit, the short circuit currents of the circuit are effectively reduced, and therefore short circuit power consumption is reduced.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, and in particular relates to a voltage source circuit for digital circuits. Background technique [0002] With the increasing development of digital integrated circuits and analog integrated circuits, the issue of low power consumption is becoming more important in the current technology, and power consumption is proportional to the square of the power supply voltage, so lower power supply voltage becomes more and more important. However, with the gradual reduction of the power supply voltage, the proportion of short-circuit power consumption in the total power consumption of the circuit increases, and even in today's advanced technology, the short-circuit power consumption even tends to exceed the dynamic power consumption. [0003] Such as figure 1 A traditional CMOS inverter is shown, because the input signal is not completely ideal, resulting in the power supply voltage V during the ...

AI Technical Summary

Problems solved by technology

However, with the gradual reduction of power supply voltage, the proportion of short-circuit power consumption in the total power consumption of the circuit increases, and even in today's advanced technology, short-circuit power consumption even tends to exceed dynamic power consumption

[0003] like figure 1 A traditional CMOS inverter is shown, because the input signal is not completely ideal, resulting in the power supply voltage V during the switching process DD There is a branch path between GND and GND in a short period of time, at this time, the NMOS and PMOS tubes will be turned on at the same time

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