Analog Conditioning of Bioelectric Signals
First Claim
1. An operational amplifier circuit for conditioning analog bio-signals comprising:
- an operational amplifier, wherein the operational amplifier comprises;
a non-inverting input terminal; and
an inverting input terminal, wherein the inverting input terminal and the non-inverting input terminal are configured to be coupled to a common reference potential through resistors;
a high-pass filter portion configured to receive a bio-signal as input, the high-pass filter portion further configured to provide input to the non-inverting input terminal of the operational amplifier; and
a feedback loop comprising a low-pass filter portion, the low-pass filter portion configured to receive input from an output of the operational amplifier, the low-pass filter portion further configured to provide input to the inverting input terminal of the operational amplifier,wherein the operational amplifier circuit is configured to output an amplified filtered version of the bio-signal.
1 Assignment
0 Petitions
Accused Products
Abstract
An operational amplifier circuit is described. The operational amplifier circuit includes an operational amplifier, a high-pass filter portion, and a feedback loop, wherein the operational amplifier circuit is configured to output an amplified filtered version of a bio-signal. The operational amplifier includes a non-inverting input terminal, and an inverting input terminal, wherein the inverting input terminal and the non-inverting input terminal are configured to be coupled to a common reference potential through resistors. The high-pass filter portion is configured to receive a bio-signal as input and to provide input to the non-inverting input terminal of the operational amplifier. The feedback loop includes a low-pass filter portion, wherein the low-pass filter portion is configured to receive input from an output of the operational amplifier and to provide input to the inverting input terminal of the operational amplifier.
-
Citations
50 Claims
-
1. An operational amplifier circuit for conditioning analog bio-signals comprising:
-
an operational amplifier, wherein the operational amplifier comprises; a non-inverting input terminal; and an inverting input terminal, wherein the inverting input terminal and the non-inverting input terminal are configured to be coupled to a common reference potential through resistors; a high-pass filter portion configured to receive a bio-signal as input, the high-pass filter portion further configured to provide input to the non-inverting input terminal of the operational amplifier; and a feedback loop comprising a low-pass filter portion, the low-pass filter portion configured to receive input from an output of the operational amplifier, the low-pass filter portion further configured to provide input to the inverting input terminal of the operational amplifier, wherein the operational amplifier circuit is configured to output an amplified filtered version of the bio-signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 41, 42)
-
-
15. A method of conditioning analog bio-signals comprising:
-
receiving at a high-pass filter portion a bio-signal; filtering the bio-signal with the high-pass filter portion to output a filtered version of the bio-signal, the filtered version of the bio-signal comprised of frequency components above a first cutoff frequency; receiving at a non-inverting input terminal of an operational amplifier the filtered version of the bio-signal from the high-pass filter portion; amplifying the high-pass filtered version of the bio-signal with the operational amplifier, the operational amplifier having a feedback loop comprised of a low-pass filter portion, the low-pass filter portion providing a further filtered version of the bio-signal as input to the inverting input terminal of the operational amplifier, the further filtered version of the bio-signal comprised of frequency components above the first cutoff frequency and below a second cutoff frequency, the inverting input terminal and the non-inverting input terminal configured to be coupled to a common reference potential through resistors, wherein the operational amplifier is configured to provide an amplified filtered version of the bio-signal; and outputting the amplified filtered version of the bio-signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
-
-
39. A chip for conditioning analog bio-signals comprising:
-
a plurality of operational amplifiers to receive a plurality of analog bio-signals from a plurality of biosensors and generate amplified versions of the bio-signals as output; a multiplexer configured to generate an analog output by multiplexing the output from the plurality of operational amplifiers; an anti-aliasing filter configured to generate a filtered output by filtering the analog output from the multiplexer; and an analog-to-digital converter configured to generate a digital output by digitizing the filtered output from the anti-aliasing filter. - View Dependent Claims (40)
-
-
43. A method of conditioning analog bio-signals comprising:
-
receiving bio-signals of a subject from a plurality of bio-signal detectors; filtering each bio-signal with a high-pass filter portion and a low-pass filter portion, the high-pass filter portion generating a first filtered version of the bio-signal comprised of frequency components above a first cutoff frequency, the low-pass filter portion generating a second filtered version of the bio-signal comprised of frequency components between the first cutoff frequency and a second cutoff frequency; amplifying each filtered version of a bio-signal with an operational amplifier to generate an amplified filtered version of the bio-signal, the operational amplifier having a non-inverting input terminal and an inverting input terminal, the non-inverting input terminal and the inverting input terminal configured to be coupled to a common reference potential through resistors; multiplexing the amplified filtered versions of the bio-signals with a multiplexer, the multiplexer configured to output an analog signal; and digitizing the analog signal with an analog-to-digital converter, the analog-to-digital converter configured to generate digitized samples of the analog signal. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50)
-
Specification