Abstract
Incorporating a feedback loop in the input stage of an OTA can improve the frequency response. The feedback loop elements are inexpensive to integrate since no capacitors or resistors are involved. The feedback loop consists of a common source amplifier driving a diode-connected transistor. This arrangement introduces pole-zero pairs in the frequency response. While retaining a dominant pole, the feedback effectively makes the additional poles insignificant. As a result of introducing zeros into the response, the bandwidth of the amplifier is enhanced. The desired amount of feedback can be established by scaling the transistor geometries involved.
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