Linear voltage regulator for low-power digital circuit of chip
a digital circuit and low-power technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of increased leakage current of the chip, increased power consumption of the digital circuit, and high supply voltage, so as to reduce the operating supply voltage of the digital circuit and reduce power consumption.
Active Publication Date: 2019-05-16
APLUS SEMICON TECH CO LTD
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Benefits of technology
The present invention provides a linear voltage regulator for a low-power digital circuit that reduces power consumption by affecting the operating supply voltage of the circuit. This is done by using a reference related to the threshold voltage of the MOS, which allows the regulator to reflect changes in process conditions and ambient temperature.
Problems solved by technology
However, a leakage current of the chip increases because of the constant output of the voltage regulator.
In conventional linear voltage regulator circuits, a minimum operating voltage required in the worst case is set as a threshold voltage so as to ensure that the chip can operate under various process conditions, thus resulting in high supply voltage and increased power consumption of the digital circuit.
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[0012]With reference to FIG. 1, FIG. 1 is a schematic circuit diagram of a conventional linear voltage regulator. Taking a 40 nm CMOS process as an example, a standard voltage of a key device is 1.1V according to the design of the conventional linear voltage regulator.
[0013]With reference to FIG. 2, FIG. 2 is a schematic module diagram of a first embodiment of a linear voltage regulator for a low-power digital circuit of a chip according to the present invention. As shown in FIG. 2, the linear voltage regulator for a low-power digital circuit of a chip according to the first embodiment of the present invention at least includes a reference voltage varying with a threshold voltage, a buffer formed by amplifiers, and a compensation capacitor. The reference voltage consists of two gate-source voltages VGS of an MOS operating in a sub-threshold region. The reference voltage Vref satisfies the following relation: Vref ∝β(|VGS1|+VGS2), where VGS1 is a first gate-source voltage of the MOS ...
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The present invention relates to a linear voltage regulator for a low-power digital circuit of a chip, comprising a reference voltage varying with a threshold voltage, a buffer formed by amplifiers, and a compensation capacitor. The reference voltage is used as an input end of the buffer, an output voltage of the buffer, having a current driving capability, is kept consistent with the reference voltage, and the compensation capacitor is configured to decrease the fluctuation range of the output voltage when a current load varies. The reference voltage comprises two gate-source voltages of an MOS operating in a sub-threshold region, and the reference voltage Vref satisfies the following relation: Vref ∝β(|VGS1|+VGS2); the reference voltage Vref flows through the output buffer formed by the amplifiers to supply a voltage to a digital circuit. By adopting a reference related to the threshold voltage of the MOS, the reference voltage will also vary with the changes in the process conditions and ambient temperature, so that an output of a linear voltage regulator can reflect such changes in the conditions, thereby reducing the operating supply voltage of the digital circuit and greatly reducing the power consumption accordingly.
Description
TECHNICAL FIELD[0001]The present invention relates to the technical field of voltage regulation, and in particular to a linear voltage regulator for a low-power digital circuit of a chip.BACKGROUND OF THE PRESENT INVENTION[0002]In today's designs of a chip, multiple voltage domains are usually required, and the voltages of digital circuits, analog circuits and external interface circuits are all different. An effective way to supply power to these circuits is a linear voltage regulator. At present, a universal linear voltage regulator, as shown in FIG. 1 of Patent CN106200741A entitled Current Sink Load Circuit and Low-Dropout Linear Voltage Regulator, consists of a bandgap reference source, an error amplifier, a power transistor and a sampling circuit. An important characteristic of voltage regulators of this type is to maintain the stability of an output voltage under various conditions. The bandgap reference source used for a reference voltage ensures a very little change in the ...
Claims
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IPC IPC(8): G05F1/575G05F1/569
CPCG05F1/569G05F1/461G05F1/575G05F1/567G05F1/468
Inventor CAI, SHUIHE
Owner APLUS SEMICON TECH CO LTD