Low power consumption power supply start-up reset circuit and reference signal circuit
A power start-up and reference signal technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as large operating current, high manufacturing cost, and complicated circuits
Active Publication Date: 2021-01-26
RICHTEK TECH
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Problems solved by technology
[0003] However, the prior art POR circuit or reference signal circuit constructed with a bandgap circuit formed by bipolar transistors has the disadvantage of requiring bipolar transistors and complex circuits, so the manufacturing cost is relatively high, and requires high operating current
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[0078] The drawings in the present invention are all schematic diagrams, mainly intended to show the coupling relationship between various circuits and the relationship between various signal waveforms. As for the circuits, signal waveforms and frequencies, they are not drawn to scale.
[0079] see figure 1 , shown in the figure is a kind of embodiment (POR circuit 1) of the POR circuit of the present invention, POR circuit 1 generates a power supply and starts resetting (Power-On Reset, POR) signal VPOR according to an input voltage VDDA, POR circuit 1 includes a signal generating circuit 10 and a comparing circuit 20. The signal generation circuit 10 generates a first signal VS1 and a second signal VS2 according to the input voltage VDDA. The comparison circuit 20 has a first input terminal IN1 and a second input terminal IN2, which are electrically connected to the first signal VS1 and the second signal VS2 respectively, wherein the comparison circuit 20 compares the first...
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A low power consumption power supply starts a reset circuit and a reference signal circuit. The power-on reset circuit includes a signal generation circuit for generating a first signal and a second signal according to an input voltage; and a comparison circuit with an input offset, including a first MOS transistor, which is of a first conductivity type, and has a A gate of the first conductivity type and a first threshold voltage, and a second MOS transistor, which is of the first conductivity type and has a gate of the second conductivity type and a second threshold voltage; the input offset is related to the first threshold The difference between the voltage and the second threshold voltage; the first signal and the second signal are respectively used to control the first MOS transistor and the second MOS transistor to generate a POR signal. When the input voltage rises above a POR threshold, the comparison output signal is generated by The first state transitions to the second state; wherein the POR threshold is roughly the product of the input offset and a default multiplier.
Description
technical field [0001] The invention relates to a power start reset circuit and a reference signal circuit, in particular to a power start reset circuit and a reference signal circuit with low power consumption and low temperature coefficient. Background technique [0002] Generally speaking, in the prior art Power-On Reset (POR) circuit or reference signal circuit, in order to maintain the POR threshold or the low temperature coefficient of the reference signal, most of them adopt bipolar transistors to form energy A bandgap reference voltage generator is used to generate a reference voltage with a low temperature coefficient as a reference signal, or to obtain a POR signal by comparing the reference voltage with a divided voltage of the power supply voltage. [0003] However, the prior art POR circuit or reference signal circuit constructed by a bandgap circuit formed by bipolar transistors has the disadvantage of requiring bipolar transistors and complex circuits, so the ...
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IPC IPC(8): G05F1/575
CPCG05F1/575
Inventor 魏进元王志贤
Owner RICHTEK TECH