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Amplifiers and Comparators

In electronics, a comparator is a device that compares two voltages or currents and outputs a digital signal indicating which is larger. It has two analog input terminals V_+\, and V_-\, and one binary digital output V_o\,. The output is ideally A comparator consists of a specialized high-gain differential amplifier. They are commonly used in devices that measure and digitize analog signals, such as analog-to-digital converters (ADCs), as well as relaxation oscillators. An operational amplifier (op-amp) has a well balanced difference input and a very high gain. This parallels the characteristics of comparators and can be substituted in applications with low-performance requirements.[4] In theory, a standard op-amp operating in open-loop configuration (without negative feedback) may be used as a low-performance comparator. When the non-inverting input (V+) is at a higher voltage than the inverting input (V-), the high gain of the op-amp causes the output to saturate at the highest positive voltage it can output. When the non-inverting input (V+) drops below the inverting input (V-), the output saturates at the most negative voltage it can output. The op-amp's output voltage is limited by the supply voltage. An op-amp operating in a linear mode with negative feedback, using a balanced, split-voltage power supply, (powered by ± VS) has its transfer function typically written as: V_{out}=A_{o} (V_1 - V_2). However, this equation may not be applicable to a comparator circuit which is non-linear and operates open-loop (no negative feedback)

Linear > Amplifiers and Comparators > OP AMP

型号	DS	厂牌	批号	数量	地区	采购
NJM2904D		JRC	-	10000	中国	要求报价
NJM2904D		JRC	-	16104	台湾	要求报价
NJM2904D		JRC	-	1000	台湾	要求报价
NJM2904D		JRC	2021+	45000	中国	要求报价
NJM2904D		JRC	2018+	1000	中国	要求报价
NJM2904D		JRC	2010+	2500	香港	要求报价
NJM2904D		JRC	-	505	中国	要求报价
LM2904DT		STM	202244+	20000	韩国	要求报价
LM2904DT		STM	2021+	10000	韩国	要求报价
LM2904DT		STM	-	15000	德国	要求报价
LM2904DT		STM	-	5400	法国	要求报价
LM2904DT		STM	2015+	2027	德国	要求报价
LM2904DT		STM	-	30000	香港	要求报价
LM2904DT		STM	-	40505	德国	要求报价
LM2904DT		STM	2010+	1440	德国	要求报价
LM2904DT		STM	-	2500	中国	要求报价
LM2904DT		STM	2023+	200000	中国	要求报价
LM2904DT		STM	2013+	9857	德国	要求报价
LM2904DT		STM	-	181	瑞典	要求报价
LM2904DT		STM	2024+	10000	中国	要求报价
LM2904DT		STM	2006+	6641	瑞典	要求报价

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