Abstract: Adding a charge pump provides ±5V supply rails to the operational amplifier internal to a high-side current-sense amplifier. This modification enables that amplifier to sense currents down to 0V common-mode inputs. The circuit c...

摘要：有些系統要求測量輸出到負載的功率，這比通過傳統的電流檢測放大器簡單測量電流更為重要。負載功率測量可以精確管理電池或交流適配器供電設備的功率。該應用筆記顯...

摘要：在典型的光電二極管電流監測應用中，電流監測器和雪崩光電二極管(APD)之間的壓降隨溫度和電流而變化，由此改變了總增益。本應用筆記介紹了一種利用穩壓電路保持電流檢...

摘要：ISDN、電信等系統需要一個負壓電流檢測放大器。本應用筆記介紹了一種設計負壓電流檢測放大器的方法。這種方法非常靈活，經過簡單修改即可用于不同的負壓電流檢測。本...

摘要：將模擬乘法器和高邊電流檢測放大器相結合，能夠在筆記本電腦或其它便攜儀器中實現電池充、放電電流的測量。本文討論將模/數轉換器(ADC)的基準電壓加到模擬乘法器的一...

Abstract: A low-power circuit formed with resistors, capacitors, a pushbutton switch, and two comparators serves as a toggle switch that directly drives loads up to 40mA, providing a known state following power up, battery insertion, or sy...

Abstract: A simple circuit consisting of a comparator and an exclusive-OR gate is sufficient to double the frequency of a reference signal. The versatile phase-locked loop (PLL) allows multiplication of a reference freque...

Abstract: A loss of AC power during darkness (sensed by a photoresistor) turns on an array of battery-powered white LEDs. To conserve power, a timer turns off the LEDs after a particular period of time (for example, 10 minutes). ...

Abstract: A simple circuit employs a small transformer and latched comparator to sense the state of a digital line without drawing power from the line. Electronic systems must often isolate their inputs or outputs from th...

摘要：長期以來, 模擬比較器的使用一直處在它的“同伴”――運算放大器的陰影之中。設計人員發表了大量針對運算放大器的應用筆記, 而關于比較器的應用筆記較少。正是由于缺...

Abstract: The following application note shows a circuit that converts the load current of a positive power supply into a ground referenced signal voltage using the ICL7612 operational amplifier. The inexpensive circuit o...

P-channel MOSFETs (pFETs), though more expensive than pnp transistors, are free of the dissipation loss associated with base drive in a pnp circuit. pFETs also have a lower saturation voltage at light loads (Figure 1). In fact, the low RDS...

In most DC-DC converters, the normal supply currents do not allow high efficiency at low load currents. The circuit in Figure 1, however, contains micropower components that enable it to maintain 90% efficiency for load currents as low as ...

Abstract: In some electronic systems, a DC offset voltage at the inputs will contribute a significant error to the output. This is especially true in high gain configurations. An offset adjustment circuit can be added to "null" out the off...

Variable gain amplifiers often use a mechanical potentiometer to set the gain. An example is a volume control dial. However, when the analog signal path is digitally controlled, a digital potentiometer might be used to control gain. This a...

Abstract: This article provides an in depth analysis, procedure, and selection tables for selecting the optimum series voltage reference for voltage output DACs. It covers all of the important parameters such as: input supply voltage, refe...

Abstract: When it is necessary to plug in a board into a system that is currently powered, it is critical to control the inrush current to prevent damage/system fault conditions. This application provides a simple circuit to achieve this f...

摘要：電壓基準源簡單、穩定的基準電壓，作為電路設計的一個關鍵因素，電壓基準源的選擇需要考慮多方面的問題并作出折衷。本文討論了不同類型的電壓基準源以及它們的關鍵...

Abstract: This article about low-voltage ICs discusses many types of low-voltage ICs, including voltage regulators, data converters, op amps and current monitors, comparators, microprocessor supervisors, voltage references, analog switches...

摘要：運算放大器是模擬電路設計中的基本功能單元，小尺寸、高性能始終是設計人員的追求目標。本應用筆記重點介紹了運算放大器的發展方向以及設計中的折中考慮。 ...