Multichannel ultra-low noise amplifier
AssigneeCase Western Reserve University
InventorsDominique M. Durand, Yazan M. Dweiri
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Abstract
The present disclose generally relates to a multichannel low-noise amplifier. At each input to the multichannel low-noise amplifiers, a plurality of transistors can be connected in parallel. This parallel connection decreases the voltage noise beyond what is possible using a single input transistor at each input. As an additional benefit, the initial operating region of the input transistors is not changed. The multichannel low-noise amplifier can be incorporated on a single integrated circuit chip to amplify biological signals to facilitate selective recording of a property (e.g., amplifying neural signals to facilitate selective recording of neural activity).
Claims5
An apparatus comprising:
- a plurality of channels each configured to receive a unique weak electrical signal from signal recording devices, wherein each of the unique weak electrical signals is a neural signal;
- and
- an amplifier circuit comprising:
- a differential input circuit configured to input the unique weak electrical signals comprising:
- a number of inverting input parallel transistors to receive an inverting input voltage paired to
- an equal number of non-inverting input parallel transistors to receive a non-inverting input voltage,
- wherein the number and the equal number are at least four, and at least equal to another number of the plurality of channels, a current mirror circuit;
- and
- an output configured to provide amplified weak electrical signals, wherein the amplified weak electrical signals comprise noise reduced at least by the square root of the other number of the plurality of channels.
A system comprising:
- a plurality of signal recording devices, each configured to record an unique weak electrical signal, wherein each of the unique weak electrical signals is a neural signal;
- an apparatus comprising:
- a plurality of channels each configured to receive the unique weak electrical signal from the plurality of signal recording devices;
- and
- an amplifier circuit comprising:
- a differential input circuit configured to input the unique weak electrical signals comprising:
- a number of inverting input parallel transistors to receive an inverting input voltage paired to
- an equal number of non-inverting input parallel transistors to receive a non-inverting input voltage,
- wherein the number and the equal number are at least four, and at least equal to another number of the plurality of channels a current mirror circuit;
- and
- an output configured to provide amplified weak electrical signals, wherein the amplified weak electrical signals comprise noise reduced by at least the square root of the other number of the plurality of channels.
Dependencies are inferred from the claim text.