AS-P120-000 ASP120000 电源模块 Schneider Modicon

产品标题：AS-P120-000 ASP120000 电源模块 Schneider Modicon

型号：AS-P120-000 ASP120000 电源模块  

品牌： Schneider Modicon

质保：七天验收期，质保期一年

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​产品详情资料

AD620的atic
AD620是一款单片仪表放大器，基于对经典三运算放大器方法的改进。对值微调允许用户确编程增益
（G=100时为0.15%），只有一个电阻器。庞大而单一的
结构和激光晶片修整允许电路组件的紧密匹配和跟踪，从而确保该电路固有的高水平性能。
输入晶体管Q1和Q2提供高度的单差分对双极输入（图36），但由于Superϐeta处理，输入偏置电流降低了10倍。
通过Q1-A1-R1回路和Q2-A2-R2回路的反馈保持输入设备Q1和Q2的集电极电流恒定，从而通过外部增益设置电阻器RG施加输入电压。这会从G=（R1+R2）/RG+1给出的A1/A2输出中产生一个差分增益。单位增益减法器A3去除任何共模信号，产生一个参考REF引脚电位的单端输出。RG的值也决定了铰刀级的跨导。当RG降低以获得更大的增益时
跨导逐渐增加到输入晶体管的跨导。这有三个重要的优点：（a）提高开环增益以增加编程增益，从而减少与增益相关的错误。（b） 增益带宽乘积（由C1和C2以及前置放大器跨导决定）随编程增益增加而增加，从而优化频率响应。（c） 输入电压噪声降低至9 nV/√Hz，主要由输入设备的集电极电流和基极电阻决定。
内部增益电阻器R1和R2被调整为
对值为24.7 kΩ，允许使用单个外部电阻器确编程增益。
增益方程为 atic of AD620
The AD620 is a monolithic instrumentation amplifier based ona modification of the classic three op amp approach. Absolutealue trimming allows the user to program gain accurately
(to 0.15% at G = 100) with only one resistor. Monolithic
construction and laser wafer trimming allow the tight matchingand tracking of circuit components, thus ensuring the high levelof performance inherent in this circuit.
The input transistors Q1 and Q2 provide a single differentialpair bipolar input for high precision (Figure 36), yet offer 10×lower input bias current thanks to Superϐeta processing.
Feedback through the Q1-A1-R1 loop and the Q2-A2-R2 loopmaintains constant collector current of the input devices Q1and Q2, thereby impressing the input voltage across the externalgain setting resistor RG. This creates a differential gain from thenputs to the A1/A2 outputs given by G = (R1 + R2)/RG + 1. Theunity-gain subtractor, A3, removes any common-mode signal,yielding a single-ended output referred to the REF pin potential.The value of RG also determines the transconductance of thepreamp stage. As RG is reduced for larger gains, the
transconductance increases asymptotically to that of the inputtransistors. This has three important advantages: (a) Open-loopgain is boosted for increasing programmed gain, thus reducinggain related errors. (b) The gain-bandwidth product(determined by C1 and C2 and the preamp transconductance)increases with programmed gain, thus optimizing frequencyresponse. (c) The input voltage noise is reduced to a valueof9 nV/√Hz, determined mainly by the collector current and baseresistance of the input devices.
The internal gain resistors, R1 and R2, are trimmed to an
absolute value of 24.7 kΩ, allowing the gain to be programmedaccurately with a single external resistor.
The gain equation is then 

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