Full
Outline
To solve the problem of poor transient response of a traditional capacitor-less low dropout linear regulator (LDO), a transient enhanced capacitor-less LDO with low power consumption was proposed, which used a push-pull Class AB operational amplifier as an error amplifier to improve the charging and discharging rate of current at the gate of a power tube. In addition, a novel type of transient enhanced circuit was designed in the LDO to detect the fluctuation of load current under the premise of low power consumption and provide extra charging and discharging current for the gate of the power tube, so as to reduce the transient fluctuation of output voltage. Based on the 0.18 μm CMOS process, the circuit, layout and simulation of the LDO were completed. Simulation results show that the output voltage of LDO was 1.5 V in the input voltage range of 1.6–4 V. Under the rated input voltage, the static current was 9.4 μA, the load current varied in the range of 0–50 mA, the output overshoot voltage and undershoot voltage of the LDO were 56 mV and 55 mV, respectively, and the stable time was within 1.7 μs. In the full-load range of 0–50 mA, the output overshoot voltage and undershoot voltage of the LDO were reduced, and the transient performance was greatly improved. As a result, the designed LDO can meet the application requirements.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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