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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 | 2018+ | 1000 | 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 | 2010+ | 16 | 波兰 | 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 | 2024+ | 10000 | 中国 | 要求报价 | |
LM2904DT | STM | - | 30000 | 香港 | 要求报价 | |
LM2904DT | STM | - | 40505 | 德国 | 要求报价 | |
LM2904DT | STM | 2013+ | 9857 | 德国 | 要求报价 | |
LM2904DT | STM | 2010+ | 1440 | 德国 | 要求报价 | |
LM2904DT | STM | 2023+ | 200000 | 中国 | 要求报价 | |
LM2904DT | STM | 2015+ | 2027 | 德国 | 要求报价 | |
LM2904DT | STM | - | 181 | 瑞典 | 要求报价 | |
LM2904DT | STM | - | 62500 | 韩国 | 要求报价 | |
LM2904DT | STM | 2006+ | 6641 | 瑞典 | 要求报价 |
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