Current sensor for biomedical measurements

A current sensor for biomedical measurements comprising:

• a first amplifier;
• a first capacitor;
• a second capacitor;
• a first switch connected in parallel with the first capacitor;
• a second switch connected in parallel with the second capacitor;
• a second amplifier;
• a third capacitor;
• a resistor;
• and
• a switched capacitor network;
• wherein:
• the first capacitor and the second capacitor are connected in series and across a first input and output of the first amplifier;
• the third capacitor and the resistor are respectively connected across a first input and output of the second amplifier;
• and
• the switched capacitor network is connected between the output of the first amplifier and the first input of the second amplifier.

A current sensor for biomedical measurements comprising:

• a first amplifier;
• a first capacitor;
• a second capacitor;
• a first switch connected in parallel with the first capacitor;
• a second switch connected in parallel with the second capacitor;
• a second amplifier;
• a third capacitor;
• a resistor;
• a switched capacitor network;
• a first comparator;
• a second comparator;
• an OR gate;
• a first flip-flop;
• a second flip-flop;
• and
• a third flip-flop;
• wherein:
• the first capacitor and the second capacitor are connected in series and across a first input and output of the first amplifier;
• the third capacitor and the resistor are respectively connected across a first input and output of the second amplifier;
• the switched capacitor network is connected between the output of the first amplifier and the first input of the second amplifier;
• a first input of the first comparator and a first input of the second comparator are connected with the output of the first amplifier;
• outputs of the first comparator and the second comparator are connected to inputs of the OR gate respectively, and to clock ports of the first flip-flop and the second flip-flop;
• output of the OR gate is connected to clock port of the third flip-flop;
• D port of each of the first flip-flop, the second flip-flop, and the third flip-flop are connected with Q port of the flip-flop;
• and
• the switched capacitor network comprises a fourth capacitor, a fifth capacitor, a third switch connected in parallel with the fourth capacitor, and a fourth switch connected in parallel with the fifth capacitor, the fourth capacitor and the fifth capacitor being connected in series and connected between the output of the first amplifier and the first input of the second amplifier.