Low pressure difference linearity voltage stabilizer for enhancing performance by amplifier embedded compensation network

A low-dropout linear and compensation network technology, which is applied in the direction of instruments, control/regulation systems, and electrical variable adjustments, can solve problems such as slowing loop response speed, limiting DC gain, and sacrificing LDO performance to increase phase margin. And DC and low frequency gain, enhance stability, expand the effect of UGF

Inactive Publication Date: 2008-03-12
BEIJING MXTRONICS CORP +2
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  • Description
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Problems solved by technology

A lower UGF not only causes the loop to respond slower, but also limits the loop's DC gain
If the LDO's loop gain is low, its output voltage accuracy will be reduced accordingly
[0012] 2. Due to the limitations of working conditions, manufacturing process changes and model accurac

Method used

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  • Low pressure difference linearity voltage stabilizer for enhancing performance by amplifier embedded compensation network
  • Low pressure difference linearity voltage stabilizer for enhancing performance by amplifier embedded compensation network
  • Low pressure difference linearity voltage stabilizer for enhancing performance by amplifier embedded compensation network

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Embodiment Construction

[0047] When the feedback loop has only one stage of amplifier, as shown in Figure 4, the difference between Figure 4 and the circuit shown in Figure 1 is that the conventional first-stage differential amplifier is replaced by the first-stage differential amplifier 302 with a built-in first compensation network 309 102. The first-stage differential amplifier 302 mainly has two functions: first, it converts V REF and V FB The error signal between amplifies and adjusts the working state of the power tube 104; Second, the built-in first compensation network 309 can add a zero-pole pair whose zero frequency is lower than the pole frequency in the transfer function of the feedback loop, the zero-pole The pair can be used to cancel the phase shift generated by the higher-frequency parasitic pole in the loop (for example, the parasitic pole P3 of the non-inverting input terminal of the first-stage differential amplifier 302 ), thereby enhancing the stability of the LDO loop.

[0048...

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PUM

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Abstract

A low voltage differential linear regulator utilizes an embedded compensation network in an amplifier to improve performance, which embeds a compensation network composed of resistances and capacitances into an amplifier to increase one or a plurality of pole-zero pairs with their pole-zero frequency lower than pole frequency in a transfer function of a feedback loop without changing static operating point of the amplifier and increasing static current. Frequency of the pole-zero pairs can be accurately confirmed to enhance stability of the feedback loop of the low voltage differential linear regulator, expand loop unit gain bandwidth and increase phase margin and DC and low-frequency gain of the loop, thus enhancing performance of the low voltage differential linear regulator.

Description

technical field [0001] The invention relates to a low-dropout linear voltage stabilizer, in particular to a low-dropout linear voltage stabilizer which utilizes a built-in compensation network of an amplifier to improve performance. Background technique [0002] Closed-loop negative feedback systems are commonly used in linear integrated circuits. For example, in a low-dropout voltage regulator (LDO, Low-Dropout Voltage Regulator), it is necessary to use a feedback loop to obtain a stable output voltage. According to the Nyquist criterion, in order to ensure the stability of the closed-loop system, the phase shift of the loop at unity gain should be less than 180 degrees. However, in actual circuit design, it is generally required that the phase shift of the loop at unity gain is less than 135 degrees (that is, the phase margin is greater than 45 degrees). In most cases, control of the phase shift is achieved by including a compensation circuit in the feedback loop. [00...

Claims

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Application Information

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IPC IPC(8): G05F3/16
Inventor 沈良国严祖树赵元富张兴
Owner BEIJING MXTRONICS CORP
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