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Basic op-amp amplifier circuits

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Basic Op-amp Amplifiers Noninverting Amplifier The noninverting amplifier has the input signal connected to its noninverting input thus its input source sees an infinite impedence. There is no input offset voltage because VOS = VE = 0, hence the negative input must be at the same voltage as the positive input. The op amp output drives current into RF until the negative input is at the voltage, VIN. This action causes VIN to appear across RG. The voltage divider rule is used to calculate VIN; VOUT is the input to the voltage divider, and VIN is the output of the voltage divider. Since no current can flow into either op amp lead, use of the voltage divider rule is allowed. When RG becomes very large with respect to RF, (RF/RG)⇒0 then , VOUT = 1 Under these conditions VOUT = 1 and the circuit becomes a unity gain buffer. Inverting Amplifier In this amplifier, the noninverting input of the op amp circuit is grounded. One assumption made is that the input error voltage is zero, so the feedback keeps inverting the input of the op amp at a virtual ground (not actual ground but acting like ground). The current flow in the input leads is assumed to be zero, hence the current flowing through RG equals the current flowing through RF. Using Kirchoff’s law, we can write, the minus sign is inserted because this is the inverting input. Here the gain is only a function of the feedback and gain resistors, so the feedback has accomplished its function of making the gain independen ...
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Anonymous
Awesome! Perfect study aid.

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