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題 名 | BJT電壓峰值檢知器=BJT Peak Voltage Detector |
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作 者 | 蕭明椿; | 書刊名 | 修平學報 |
卷 期 | 8 2004.03[民93.03] |
頁 次 | 頁217-228 |
分類號 | 448.11 |
關鍵詞 | 電壓峰值檢知器; 差動放大器; 超量電壓; Peak voltage detector; Differential amplifier; Overshoot voltage; |
語 文 | 中文(Chinese) |
中文摘要 | 本文提出一種具雙極電晶體(BJT)結構之電壓峰值檢知器,其係由一參考電流產生器、一具單邊負載電晶體之差動放大器、一充電電晶體、一補償電流產生器、一電容器、一電阻器R2以及一輸出級所組成。參考電流產生器係用以提供一參考電流,且藉由電流鏡之鏡射,以提供差動放大器、補償電流產生器、以及輸出級所需之電流,該差動放大器係做為比較器使用,該充電電晶體係做為充電器使用,用以提供電容器C所需之充電電流,該補償電流產生器以產生一補償電流,以有效補償電容器因雙極電晶體之基極電流所造成之電壓降,而該輸出級則用以調整該電容器C上以電壓信號V(C),以便精確地輸出該輸入信號之峰值電壓。本文所提出之電壓峰值檢知器,不但能精確地檢測出輸入信號之峰值電壓,並且兼具電路結構簡單、佔用的晶片面積小以及有利於裝置之小型化等多重功效,同時亦設置有輸出級以便有效防止因外部電路之擷取動作而遭致破壞所保持之輸入峰值電壓。此外,本文之電壓峰值檢知器亦能有效消除差動放大器之超量電壓效應。 |
英文摘要 | This paper introduces a newly designed peak voltage detector, which consists of a reference current generator, a differential amplifier with one-sided load transistor, a charge transistor, a compensation current generator, a capacitor, a resistor, and an output stage. Among them, the current in the reference current generator is copied in order to provide it to the differential amplifier, the compensation current generator, and the output stage. The differential amplifier serves as a comparator, and the charge transistor supplies the capacitor with needed charge current. The compensation current generator is configured to provide compensation current for compensating the voltage drop of the capacitor due to the base currents in the bipolar transistors, and the output stage is configured to shift the voltage signal on the capacitor to provide a precise peak voltage of input signal. The peak voltage detector in this paper can accurately measure the peak voltage of input signal and it also comes up with advantages like simple circuit design, minimal chip size, and good for use with small devices. In addition, the inclusion of output stage can further prevent the held peak voltage disruption from the accessing activities of the outer circuits. In the meantime, the proposed peak voltage detector can further give a good elimination for the overshoot voltage in the differentifal amplifier. |
本系統中英文摘要資訊取自各篇刊載內容。