Biomedical signal sensing circuit
First Claim
1. A biomedical signal sensing circuit, comprising:
- a first modulation unit, receiving a first biomedical signal, and performing a first modulation operation to the first biomedical signal according to a first signal to generate a first modulation signal;
a second modulation unit, receiving a second biomedical signal, and performing a second modulation operation to the second biomedical signal according to a second signal to generate a second modulation signal, wherein the second signal is orthogonal to the first signal;
an amplifying unit, coupled to the first modulation unit and the second modulation unit, amplifying the first modulation signal and the second modulation signal, and adding the amplified first modulation signal and second modulation signal to generate a third modulation signal;
a first demodulation unit, coupled to the amplifying unit, and performing a first demodulation operation to the third modulation signal according to the first signal to generate a first sensing signal; and
a second demodulation unit, coupled to the amplifying unit, and performing a second demodulation operation to the third modulation signal according to the second signal to generate a second sensing signal,wherein the amplifying unit comprises;
a first capacitor, having a first terminal and a second terminal, wherein the first terminal of the first capacitor receives the first modulation signal;
a second capacitor, having a first terminal and a second terminal, wherein the first terminal of the second capacitor receives the second modulation signal;
a third capacitor, having a first terminal and a second terminal, wherein the first terminal of the third capacitor is coupled to the second terminal of the first capacitor and the second terminal of the second capacitor; and
an operational amplifier, having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the operational amplifier is coupled to the second terminal of the first capacitor, the second input terminal of the operational amplifier is coupled to a ground potential, and the output terminal of the operational amplifier is coupled to the first demodulation unit and the second demodulation unit.
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Accused Products
Abstract
A biomedical signal sensing circuit including a first and a second modulation unit, an amplifying unit, a first and a second demodulation unit is provided. The first modulation unit performs a first modulation operation to a first biomedical signal according to a first signal to generate a first modulation signal. The second modulation unit performs a second modulation operation to a second biomedical signal according to a second signal to generate a second modulation signal. The amplifying unit amplifies the first and second modulation signals, and adds the amplified first and second modulation signals to generate a third modulation signal. The first demodulation unit performs a first demodulation operation to the third modulation signal according to the first signal to generate a first sensing signal. The second demodulation unit performs a second demodulation operation to the third modulation signal according to the second signal to generate a second sensing signal.
4 Citations
10 Claims
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1. A biomedical signal sensing circuit, comprising:
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a first modulation unit, receiving a first biomedical signal, and performing a first modulation operation to the first biomedical signal according to a first signal to generate a first modulation signal; a second modulation unit, receiving a second biomedical signal, and performing a second modulation operation to the second biomedical signal according to a second signal to generate a second modulation signal, wherein the second signal is orthogonal to the first signal; an amplifying unit, coupled to the first modulation unit and the second modulation unit, amplifying the first modulation signal and the second modulation signal, and adding the amplified first modulation signal and second modulation signal to generate a third modulation signal; a first demodulation unit, coupled to the amplifying unit, and performing a first demodulation operation to the third modulation signal according to the first signal to generate a first sensing signal; and a second demodulation unit, coupled to the amplifying unit, and performing a second demodulation operation to the third modulation signal according to the second signal to generate a second sensing signal, wherein the amplifying unit comprises; a first capacitor, having a first terminal and a second terminal, wherein the first terminal of the first capacitor receives the first modulation signal; a second capacitor, having a first terminal and a second terminal, wherein the first terminal of the second capacitor receives the second modulation signal; a third capacitor, having a first terminal and a second terminal, wherein the first terminal of the third capacitor is coupled to the second terminal of the first capacitor and the second terminal of the second capacitor; and an operational amplifier, having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the operational amplifier is coupled to the second terminal of the first capacitor, the second input terminal of the operational amplifier is coupled to a ground potential, and the output terminal of the operational amplifier is coupled to the first demodulation unit and the second demodulation unit. - View Dependent Claims (2, 3)
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4. A biomedical signal sensing circuit, comprising:
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a first modulation unit, receiving a first biomedical signal, and performing a first modulation operation to the first biomedical signal according to a first signal to generate a first modulation signal; a second modulation unit, receiving a second biomedical signal, and performing a second modulation operation to the second biomedical signal according to a second signal to generate a second modulation signal, wherein the second signal is orthogonal to the first signal; an amplifying unit, coupled to the first modulation unit and the second modulation unit, amplifying the first modulation signal and the second modulation signal, and adding the amplified first modulation signal and second modulation signal to generate a third modulation signal; a first demodulation unit, coupled to the amplifying unit, and performing a first demodulation operation to the third modulation signal according to the first signal to generate a first sensing signal; and a second demodulation unit, coupled to the amplifying unit, and performing a second demodulation operation to the third modulation signal according to the second signal to generate a second sensing signal, wherein the first modulation signal comprises a first signal component and a second signal component, the first signal component is inverted to the second signal component, the second modulation signal comprises a third signal component and a fourth signal component, the third signal component is inverted to the fourth signal component, wherein the amplifying unit comprises; a first capacitor, having a first terminal and a second terminal, wherein the first terminal of the first capacitor receives the first signal component; a second capacitor, having a first terminal and a second terminal, wherein the first terminal of the second capacitor receives the second signal component; a third capacitor, having a first terminal and a second terminal, wherein the first terminal of the third capacitor receives the third signal component, and the second terminal of the third capacitor is coupled to the second terminal of the first capacitor; a fourth capacitor, having a first terminal and a second terminal, wherein the first terminal of the fourth capacitor receives the fourth signal component, and the second terminal of the fourth capacitor is coupled to the second terminal of the second capacitor; a fifth capacitor, having a first terminal and a second terminal, wherein the first terminal of the fifth capacitor is coupled to the second terminal of the first capacitor; a sixth capacitor, having a first terminal and a second terminal, wherein the first terminal of the sixth capacitor is coupled to the second terminal of the second capacitor; and an operational amplifier, having a first input terminal, a second input terminal, a first output terminal and a second output terminal, wherein the first input terminal of the operational amplifier is coupled to the second terminal of the first capacitor, the second input terminal of the operational amplifier is coupled to the second terminal of the second capacitor, the first output terminal of the operational amplifier is coupled to the second terminal of the fifth capacitor, and the second output terminal of the operational amplifier is coupled to the second terminal of the sixth capacitor. - View Dependent Claims (5)
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6. A biomedical signal sensing circuit, comprising:
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a first modulation unit, receiving a first biomedical signal, and performing a first modulation operation to the first biomedical signal according to a first signal to generate a first modulation signal; a second modulation unit, receiving a second biomedical signal, and performing a second modulation operation to the second biomedical signal according to a second signal to generate a second modulation signal, wherein the second signal is orthogonal to the first signal; an amplifying unit, coupled to the first modulation unit and the second modulation unit, amplifying the first modulation signal and the second modulation signal, and adding the amplified first modulation signal and second modulation signal to generate a third modulation signal; a first demodulation unit, coupled to the amplifying unit, and performing a first demodulation operation to the third modulation signal according to the first signal to generate a first sensing signal; and a second demodulation unit, coupled to the amplifying unit, and performing a second demodulation operation to the third modulation signal according to the second signal to generate a second sensing signal, wherein the first biomedical signal comprises a first differential signal component and a second differential signal component, the first differential signal component is inverted to the second differential signal component, the second biomedical signal comprises a third differential signal component and a fourth differential signal component, the third differential signal component is inverted to the fourth differential signal component, the first signal comprises a first portion and a second portion, the first portion is inverted to the second portion, the second signal comprises a third portion and a fourth portion, and the third portion is inverted to the fourth portion, wherein the first modulation unit has a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a first output terminal and a second output terminal, the first input terminal of the first modulation unit receives the first differential signal component, the second input terminal of the first modulation unit receives the second differential signal component, the third input terminal of the first modulation unit receives the first portion, and the fourth input terminal of the first modulation unit receives the second portion, wherein the second modulation unit has a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a first output terminal and a second output terminal, the first input terminal of the second modulation unit receives the third differential signal component, the second input terminal of the second modulation unit receives the fourth differential signal component, the third input terminal of the second modulation unit receives the third portion, the fourth input terminal of the second modulation unit receives the fourth portion, and the first output terminal of the second modulation unit is coupled to the second output terminal of the first modulation unit. - View Dependent Claims (7, 8, 9, 10)
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Specification