Power supply response circuit and analog chip
A power supply voltage and circuit technology, which is applied in the field of power response circuits and analog chips, can solve problems such as poor stability of internal nodes in the circuit, misoperation of inverters, and errors in subsequent circuits.
Pending Publication Date: 2022-05-20
SG MICRO
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Problems solved by technology
Therefore, during the second power-on process after the power supply drops rapidly, because the loop charge is not completely released, it will cause the inverter to malfunction, and the circuit will not be able to generate a correct power-on reset signal, resulting in an error in the subsequent circuit
[0004] A method in the prior art utilizes the characteristic that the capacitor voltage cannot change suddenly, and directly connects the nodes that need to follow the change of the power supply voltage to the power supply through the capacitor. Although this method can ensure that these nodes can follow the change of the power supply voltage, the fluctuation of the power supply voltage In small cases, this structure can lead to poor stability of the internal nodes of the circuit
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[0022] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale. Also, some well-known parts may not be shown in the drawings.
[0023] In the following, many specific details of the present invention, such as structures, materials, dimensions, processes and techniques of components, are described for a clearer understanding of the present invention. However, the invention may be practiced without these specific details, as will be understood by those skilled in the art.
[0024] It should be understood that in the following description, "circuitry" may include single or multiple combined hardware circuits, programmable circuits, state machine circuits and / or elements capable of storing instructions for execution by programmable circuits. When an e...
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The invention discloses a power supply response circuit and an analog chip, the power supply response circuit comprises a voltage detection module and a charging and discharging module, the voltage detection module is connected between a power supply voltage and a second node, and the voltage detection module is used for providing a first current for the second node according to a voltage difference between the power supply voltage and a first bias voltage; the charging and discharging module is respectively connected with a first node and a second node in the power utilization circuit, and the charging and discharging module is used for providing a charge release path for the first node according to the potential of the second node, so that the nodes in the analog chip can change along with the voltage of the power supply, and correct response is generated to power failure and secondary power-on of the power supply.
Description
technical field [0001] The invention relates to the technical field of analog circuits, and in particular to a power response circuit and an analog chip. Background technique [0002] The existing digital-analog signal integrated circuits contain analog circuits (such as voltage regulator circuits and bandgap reference circuits). When the power supply voltage fluctuates, we hope that some nodes in the analog circuit can follow the power supply voltage to change, especially when the power supply is fast In the case of falling and rising rapidly, it is ensured that the charge of the internal nodes of the circuit can be released quickly to produce a correct response to the power-off and secondary power-on. [0003] Such as figure 1 A schematic circuit diagram of a conventional power-on reset circuit is shown. Such as figure 1 As shown, the power-on reset circuit 100 includes a resistor R1, a capacitor C1, and an inverter INV1 and an inverter INV2 implemented by PMOS transist...
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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 崔先宇谢程益
Owner SG MICRO