The Ideal Opamp

May 15th, 2015
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Beginning with ideal opamp is the natural way to understand the analog integrated circuits. Fig.(1) shows the symbol of simplified ideal opamp with three terminals. The terminals v+ and v− are called the non-inverting and inverting input terminals and vo is the output terminal

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1The Ideal OpampBeginning with ideal opamp is the natural way to understand the analog integrated circuits. Fig.(1) shows the symbol of simplied ideal opamp with three terminals. The terminals v+ and v? are called the non-inverting and inverting input terminals and vo is the output terminal.vv+?vo+Figure 1: The Basic Operational Amplier CircuitThe relationship between the input and output terminals is given as, vo = A(v+ ? v? ).(1)where A is called as the gain of the opamp. The three voltages v+ , v? and vo are all measured with respect to ground. The input impedance or Ri is the resistance measured between the inverting and non-inverting terminals. The resistance Ro or the output resistance is the resistance the load would see if it were connected to the output terminal. With these basic denitions we are now ready to see the properties as applied to the ideal opamp.1.1Properties of Ideal OpampThe following are the properties of ideal opamp which should be read with some care as it forms the basis for the opamp analysis. They are worth memorizing as they are frequently used:1. The gain of the ideal opamp is innite A = ?.2. The input impedance is also innite Ri = ?.3. The output impedance is zero Ro = 0.4. The bandwidth of the ideal opamp ranges from 0 to ?.5. The output of the opamp can source or sink any current and can supply any voltage.Its quite interesting to note that the properties of practical opamp comes amazingly close to

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