A review paper on comparative study on single structure OTA-C low pass filter and multiple structure OTA-C low pass filter. OTA single structure LC filter has a limitation in obtaining -3dB cut off frequency in the range from KHz to MHz. The variation in the frequency with the bias current is inconsistent, because fine tuning is not possible in obtaining -3dB frequency. In order to eliminate inconsistency, and to obtain fine tuning the LC filter is developed using multiple OTAs representing the transconductances gm 1=gm= 1=gm 2 > g m. Under the stated relation a sharp variation in -3dB cut off frequency is observed by tuning the respective transconductances of the system of OTAs in respect of the inequality. The -3dB frequency obtained are linearly related with bias current which is due to the suited value of floating inductance of the filter. Such types of filters are useful in high frequency applications and in instrumentation such as channel analyser.

Single Operational Transconductance Amplifier (OTA) Filters

Citations

A study of multiple ota-c active low pass filter

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