Transconductance-capacitor filter circuit with current sensor circuit

A transconductance-capacitor filter system, comprising:

• a voltage to current conversion stage comprising;
• a first transconductance amplifier having a first pair of inputs, a first current path coupled to a first node, and a second current path coupled to a second node, the first transconductance amplifier operable to provide a first level of AC current to the first node and operable to pull the first level of AC current from the second node responsive to a first voltage across the first pair of inputs;
• and
• a second transconductance amplifier having a second pair of inputs, a third current path coupled to the first node, and a fourth current path coupled to the second node, the second transconductance amplifier operable to provide a second level of AC current to the first node and operable to pull the second level of AC current from the second node responsive to a second voltage across the second pair of inputs;
• an integrator stage having a pair of outputs, a fifth current path coupled to the first node, and a sixth current path coupled to the second node, the integrator stage operable to conduct a sum of the first level of AC current and the second level of AC current from the first node to the second node and operable to provide an output voltage across the pair of outputs responsive to the sum of the first level of AC current and the second level of AC current;
• and
• a current sensor circuit having a first input coupled to the first node, and a second input coupled to the second node, the current sensor circuit operable to sense the sum of the first level of AC current and the second level of AC current.