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Can any one plz tell me what the main difference is b/w OTA and simple op amp....and strategy we need to use to design for example a telescopic amplifier?
OTA's are designed to be the gain stages of an opamp. the result is a high output impedance. This can sometimes be overcome by the very high gain. An opamp provides an OTA with a current gain stage to act as a buffer. In some cases the buffer is too expensive or undesirable, making the simple OTA a desirable choice.
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