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Research Paper | Electronics & Communication Engineering | India | Volume 4 Issue 4, April 2015

A Review Paper on Frequency Compensation of Transconductance Operational Amplifier (OTA)

Raghavendra Gupta | Prof. Sunny Jain

Abstract: In this brief, types of frequency compensation for operation transconductance amplifier are explained in detail. Compensation which is used to enhance frequency stability of the OTA, and to make gain and phase linear for required frequency range. As we know capacitor inside the OTA causes output to lag behind by 90 with each pole they create, If the addition of these phase lags add-up to 360, the output signal will be in phase with the input signal. Feeding output signal back in proportion to input when the gain of the amplifier is sufficient will cause the amplifier to oscillate. To avoid such undesirable condition frequency compensation is required in OTA, the frequency compensation is used to make a particular pole dominant on other poles to make the transfer function 2nd order.

Keywords: CMOS technology, operational amplifier, operational trans-conductance amplifier OTA, Gain Bandwidth Product GBW, Phase margin, positive feedback, gain enhancement

Edition: Volume 4 Issue 4, April 2015,

Pages: 1658 - 1662