|Abstract: ||摘要 |
系統中，前端是採用電感式耦合效應 (無線傳輸方式)來傳輸電源及高資料量，因此傳輸電源中含有載頻的交流信號，交流信號可經由全波整流器轉換成直流信號，再運用低壓降穩壓器(Low Drop-out Regulator, LDO)之特性，達到輸出直流電壓穩定與降低電源雜訊干擾之效果。
此篇論文電路架構採用P-Channel MOSFET做為LDO的調節傳輸元件(Pass element)輸出穩定1.8V的低壓降穩壓系統且產生輸出1mA 0.1或1mA電流驅動負載，分別給予推挽式電路及其他補償式電路。此低壓降線性穩壓器採用 ′cic018.1′ 模擬製程進行模擬實現。
In recent years , with the rapid development in the Biomedical system and VLSI, the chip circuit applied to medical electronic equipment, not only the implanting types but also the portable ones, has become tinier and tinier.Therefore, low power consumption or power efficiency enhancement is the main concern when designing these portable electronics.
Especially for the implanting chip of high data-rate transmission, such as the cochlear systems, retinal prostheses, by using wireless transmission, the inductive coupling effect can transmit signals of supplying power and controling the chip, which can prevent wound infection and the regular replacement of the half-invading battery by sugery.
In the system, the inductive coupling effect is adopted at the front end to transmit powers and High Data. Therefore, the power contains the AC signal of carrier frequency. The AC signal then can be converted to the DC signal via the full-wave rectifier. Accordingly, as the characteristics of Low Drop-out Regulator(LDO), it stabilizes the output of the DC signal and reduces the power supply ripples.
The circuit structure in this thesis adopts P-Channel MOSFET, an adjustment pass element, to regulate the LDO. Moreover,it enables the Low Dropout regulation system to stabilize at 1.8V and produces load current which is between 0.1mA or 1mA. It also includes push-pull output circuit and other compensating type circuit separately. Besides, the Low Dropout linear regulator undergoes the simulation of ′cic018.l′ process.