Low-power, low-noise CMOS amplifier
OwnerReid R. Harrisoninventor
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Abstract
Devices and methods for amplifying weak electric signals are described. The device of the invention includes an amplifier that is fully integrated in a standard CMOS process and is capable of rejecting large DC offsets while amplifying signals down to the sub-Hz range. This result is achieved by using single-transistor MOS “pseudo-resistor” elements to achieve a very low cutoff frequency in the mHz range or lower. When combined with an electrode array or other sensor array, the fully-integrated amplifier is suitable for recording biological and biopotential signals from the mhz range up to and including about 7 kHz. The amplifier also rejects dc offsets at the input and offers a superior power-noise tradeoff than other amplifiers currently available.
Claims32
A fully-integrated amplifier for amplifying electrical signals in the mHz to kHz range while rejecting large DC offsets.
A biosignal amplifier comprising at least one MOS transistor or other circuit element having a large incremental resistance for small voltages that operates as a pseudo-resistor to amplify electrical signals down to the Hz and sub-Hz range while rejecting large DC offsets.
An amplifying system, comprising a fully-integrated amplifier for amplifying electrical signals down to the Hz or sub-Hz range while rejecting large DC offsets.
An amplifying system, comprising a biosignal amplifier comprising at least one MOS transistor that operates as a pseudo-resistor to amplify electrical signals down to the Hz or sub-Hz range while rejecting large DC offsets.
A method for amplifying a neural or other biopotential signal, comprising:
- providing a source of neural or other biopotential signals;
- providing a fully-integrated amplifier for amplifying electrical signals in the mHz to kHz range while rejecting large DC offsets;
- and
- electrically connecting the amplifier with the signal source.
A method for amplifying a neural or other biopotential signal, comprising:
- providing a source of neural or other biopotential signals;
- providing a bioamplifier comprising at least one MOS transistor that operates as a pseudo-resistor to amplify electrical signals down to the Hz or sub-Hz range while rejecting large DC offsets;
- and
- electrically connecting the amplifier with the neural signal source.
A fully-integrated amplifier for amplifying electrical signals down to the Hz or sub-Hz range while rejecting large DC offsets, comprising one or more single-transistor MOS pseudo-resistors in series.
Dependencies are inferred from the claim text.