Lab4 OpAmps and Active Filters

Lab4 OpAmps and Active Filters - 4 4.1 OPAMPS AND ACTIVE...

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4 O P A MPS AND A CTIVE F ILTERS 4.1 O BJECTIVES To understand the principle of Operational Amplifiers and their use in Amplification/Attenuation and in active low-pass and high-pass filters 4.2 I NTRODUCTION Operational Amplifiers are low cost, simple to use and serve myriad of applications. For instance they can be used as buffers (to prevent loading errors), as amplifiers to magnify a signal;s amplitude, as well as integrator/differentiator and adders/subtractors. The latter functionality is where the Operational Amplifier gets its name. OpAmps are near ideal amplifiers with a near infinite input impedance (up to 10 M Ω ), and a near zero output impedance (typically 1 Ω ) . The theoretical open loop amplification factor is very high, in the order of . To obtain reasonable amplification values, external resistors are used. The resulting amplification is termed the closed loop amplification factor. When components such as capacitors are added, filters are obtained. The combination of an amplification and filter function is called an active filter. The datasheet of the most commonly used OpAmp the 741 can be found 6 10 here .
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Lab4 OpAmps and Active Filters - 4 4.1 OPAMPS AND ACTIVE...

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