Multipath instrumentation amplifier

A multipath instrumentation amplifier, having voltage input terminals and voltage output terminals, comprising:

• a low-frequency amplifier circuit and a high-frequency amplifier circuit coupled between the voltage input terminals and the voltage output terminals, wherein the voltage input terminals are coupled to an input voltage, the low-frequency amplifier circuit and the high-frequency amplifier circuit are configured to amplify the input voltage and transmit the amplified input voltage to the voltage output terminals, the high-frequency amplifier circuit is configured to reduce voltage ripples across the voltage output terminals, and the high-frequency amplifier circuit comprises:
• a first amplifier and a second amplifier, wherein an inverting output terminal and a non-inverting output terminal of the first amplifier are respectively coupled to a non-inverting input terminal and an inverting input terminal of the second amplifier, and a non-inverting output terminal and an inverting output terminal of the second amplifier are coupled to the voltage output terminals;
• a first input resistor and a first input capacitor coupled in series between a first reference voltage and the voltage input terminal, and a node between the first input resistor and the first input capacitor is coupled to a non-inverting input terminal of the first amplifier;
• a second input resistor and a second input capacitor coupled in series between the first reference voltage and the voltage input terminal, and a node between the second input resistor and the second input capacitor is coupled to an inverting input terminal of the first amplifier;
• a first feedback capacitor coupled between the voltage output terminal and the inverting input terminal of the first amplifier;
• and
• a second feedback capacitor coupled between the voltage output terminal and the non-inverting input terminal of the first amplifier.