| Summary: | 碩士 === 國立虎尾科技大學 === 電機工程研究所 === 99 === In the traditional linear regulator, due to the characteristics of the linear regulator will vary with load, in order to ensure stability under different load, the bandwidth will be subjected to restrictions, leading to transient aspects of along with limited features. Therefore, we expect to encounter on the traditional architecture can overcome the bottleneck, so the regulator can achieve good transient response.
A fast-transient linear regulator with real-time current compensation circuit was proposed. The real-time current compensation circuit contains a hysteresis comparator and two controllers which can trigger off PMOS and NMOS. While the comparator sensed the variation of output voltage, it will send a logical signal to controllers then affect the power mosfet of gate voltage by P-type or N-type transistors. Fast-transient linear regulator usually used in portable products or RFID, such as mobile phone, note book, PDA, etc.
The proposed fast-transient low-dropout regulator with real-time current compensation circuit was fabricated in TSMC 0.35μm CMOS technology and active area was 253.5 x 113.7μm2 and The LDO operates range from 2.7V to 3.3V and the regulated voltage is 1V that provide 50mA maximum load current variation. Simulation results shows that the proposed circuit improved 68mV output voltage variation and 41% stable time from light load to heavy load, 60mV output voltage variation and 78% stable time from heavy to light load.
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