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Reference circuit applied to internet of things

A technology of reference circuit and Internet of Things, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as increasing silicon area and power consumption

Pending Publication Date: 2018-08-31
丹阳恒芯电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this approach requires an operational amplifier with high open-loop gain and wide bandwidth, which obviously increases silicon area and power consumption

Method used

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  • Reference circuit applied to internet of things

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Embodiment Construction

[0012] to combine figure 1 As shown, in the following embodiments, the reference circuit applied in the Internet of Things at least includes: a start-up circuit for starting the voltage self-regulation circuit of the reference circuit; a voltage self-regulation circuit, using The self-adjusting technology is adopted, and the power supply rejection ratio of the circuit is significantly improved in a wide frequency range; a starting circuit and a reference generation circuit used to start the reference circuit avoid the power coupling noise caused by the traditional starting circuit; a reference generation circuit The circuit adopts a self-bias current mirror structure and undergoes temperature compensation to generate a high-precision reference voltage.

[0013] The start-up circuit one is composed of a first capacitor C1, a first PMOS transistor PM1, a first NMOS transistor NM1 and a second NMOS transistor NM2; at the moment of power-on, the power supply voltage VDD is a high ...

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Abstract

The invention discloses a reference circuit applied to the internet of things. The reference circuit comprises a first starting circuit, a voltage self-adjusting circuit, a second starting circuit anda reference generating circuit, wherein the first starting circuit is used for starting the voltage self-adjusting circuit of the reference circuit; the power supply rejection ratio of the referencecircuit is remarkably improved within a wide frequency range by using the self-adjusting technology through the voltage self-adjusting circuit; the second starting circuit is used for starting the reference generating circuit of the reference circuit, so that power coupling noise caused by a traditional starting circuit is avoided; the reference generating circuit uses a self-bias current mirror structure, and high-precision reference voltage is generated through temperature compensation. No operational amplifier or filter capacitor is used in the reference circuit high in power supply rejection ratio, the self-adjusting technology is adopted, and the reference voltage high in power supply rejection ratio is generated.

Description

technical field [0001] The invention relates to the field of reference voltage circuits, in particular to a reference circuit applied in the Internet of Things. Background technique [0002] In IoT applications, the latest trend in modern system-on-chip (SOC) design is to place analog circuits on the same die along with noisy digital circuits, switched capacitors and RF circuits, so the noise from the power supply cannot be ignored. This noise can significantly degrade overall system performance, especially in high precision systems. To generate a stable reference voltage in high precision applications, the reference circuit must have a high power supply rejection ratio (PSRR) at both low and high frequencies. A common approach is to use a low-dropout regulator (LDO) to power the reference circuit. But this approach requires an operational amplifier with high open-loop gain and wide bandwidth, which obviously increases silicon area and power consumption. Another approach ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 陈磊
Owner 丹阳恒芯电子有限公司