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ldo [2016/06/02 19:41] gongyu [指标] |
ldo [2016/06/02 19:51] (当前版本) gongyu [输出噪声] |
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| ====输出噪声==== | ====输出噪声==== | ||
| - | The noise from the LDO itself must also be considered in filter design. Like other electronic devices, LDOs are affected by thermal noise, bipolar shot noise, and flicker noise.[9] Each of these phenomena contribute noise to the output voltage, mostly concentrated over the lower end of the frequency spectrum. In order to properly filter AC frequencies, an LDO must both reject ripple at the input while introducing minimal noise at the output. Efforts to attenuate ripple from the input voltage could be in vain if a noisy LDO just adds that noise back again at the output. Texas Instruments' TPS7A47 is an example of an LDO with both very low noise and high PSRR over a broad frequency band.[13] | + | LDO自身产生的噪声也应该被考虑在滤波器的设计中，与其它电子器件一样，LDO也受到热噪声、双极散射噪声、以及闪变噪声的影响。所有这些噪声叠加在一起影响了输出的电压，这些噪声主要分布在低频段。为了滤除交流频率，在输入端和输出断都要进行纹波抑制。 |
| ====负载稳压==== | ====负载稳压==== | ||
| Load regulation is a measure of the circuit’s ability to maintain the specified output voltage under varying load conditions. Load regulation is defined as: | Load regulation is a measure of the circuit’s ability to maintain the specified output voltage under varying load conditions. Load regulation is defined as: | ||