Dual-path dc cancellation front-end amplifier
AssigneeAvago Technologies International Sales Pte. Limited
InventorsJunjie Lu, Jing Guo, Xicheng Jiang
Life of this patent
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Abstract
A device is provided herein. The device includes a signal input, an operational amplifier (op-amp) comprising a non-inverting op-amp input, an inverting op-amp input, and an op-amp output, a summer coupled to the op-amp output, a second summer input coupled to the signal input, and a summer output, and a low-pass filter comprising a low-pass filter input coupled to the summer output and a low-pass filter output coupled to the inverting op-amp input. The device processes electrophysiology signals by combining feedforward and feedback paths to achieve DC offset and low-frequency interference rejection while maintaining high input impedance and signal amplification.
Claims20
A device, comprising:
- a signal input;
- an operational amplifier (op-amp) comprising a non-inverting op-amp input coupled to the signal input, an inverting op-amp input, and an op-amp output;
- a summer comprising a first summer input coupled to the op-amp output, a second summer input coupled to the signal input, and a summer output;
- and
- a low-pass filter comprising a low-pass filter input coupled to the summer output and a low-pass filter output coupled to the inverting op-amp input.
A system, comprising:
- an electrode;
- and
- a front-end amplifier comprising:
- a signal input coupled to the electrode;
- an operational amplifier (op-amp) comprising a non-inverting op-amp input coupled to the signal input, an inverting op-amp input, and an op-amp output;
- a signal output coupled to the op-amp output;
- a summer comprising a first summer input coupled between the op-amp output and the signal output, a second summer input coupled to the electrode, and a summer output;
- and
- a low-pass filter comprising a low-pass filter input coupled to the summer output and a low-pass filter output coupled to the inverting op-amp input.
A non-transitory computer-readable medium comprising stored instructions to manufacture a device, the device comprising:
- a signal input;
- an operational amplifier (op-amp) comprising a non-inverting op-amp input coupled to the signal input, an inverting op-amp input, and an op-amp output;
- a low-pass filter comprising a low-pass filter input and a low-pass filter output coupled to the inverting op-amp input;
- a first resistor coupled in series between the op-amp output and the low-pass filter input;
- and
- a second resistor coupled in series between the signal input and the low-pass filter input.
Dependencies are inferred from the claim text.