# Schematics and analysis

The OTA-C LP cell is a variant of this circuit.

Kirchoff in yields:

is simply grounded. The current at the output of the OTA is:

The op-amp is used as an (inverted) current to voltage converter:

Solving for and dividing by , we find the transfer function:

The pole is at the frequency such that:

# Applications

Used in:

Patent:

# Other notes

Olivier Gillet: With +/-5V rails, Rb=10k, Rs=220, C=1nF, 1/2 TL072 for op-amp and LM13700, the OTA-C LP cell is unstable (crashes to one of the rails for signals peaking at more than 3.6V), but this configuration is not.