Receiver for removing noise generated in human body communication

Patent metadata

Field	Value
Publication number	US-11418267-B2
Application number	US-202016784151-A
Country	US
Kind code	B2
Filing date	Feb 6, 2020
Priority date	Feb 8, 2019
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

Provided is a receiver. The receiver according to the inventive concept includes a first filter circuit, a second filter circuit, and an amplifier. The first filter circuit provides a first path for first frequency components below first cutoff frequency of input frequency components and passes second frequency components except for the first frequency components of the input frequency components through second path. The second filter circuit attenuates third frequency components below a second cutoff frequency of the second frequency components. The amplifier amplifies the second frequency components including the attenuated third frequency components.

First claim

What is claimed is:

1. A receiver comprising:
a first electrode receiving an input signal that includes a noise signal and a bio signal transmitted through a human body;
a second electrode receiving a reference signal;
a first filter circuit including an inductive element coupled between a first node and a second node, and configured to pass first frequency components of the input signal received through the first node to the second node, and to pass second frequency components of the reference signal received through the second node to the first node, the first node being coupled to the first electrode, the second node being coupled to the second electrode, wherein the first frequency components and the second frequency components are below a first cutoff frequency;
a second filter circuit including a first capacitive element configured to attenuate fifth frequency components among third frequency components of the input signal, and a second capacitive element configured to attenuate sixth frequency components among fourth frequency components of the reference signal, the third frequency components representing frequency components of the input signal except for the first frequency components, the fourth frequency components representing frequency components of the reference signal except for the second frequency components, wherein the fifth frequency components and the sixth frequency components are below a second cutoff frequency; and
an amplifier configured to perform an amplification operation based on a difference between levels of the third frequency components including the attenuated fifth frequency components and levels of the fourth frequency components including the attenuated sixth frequency components,
wherein the first cutoff frequency is higher than a frequency of the noise signal and lower than a frequency of the bio signal,
wherein the first capacitive element is coupled between the first node and a third node, and the second capacitive element is coupled between the second node and a fourth node,
wherein the second filter circuit further includes:
a first resistive element coupled between a supply voltage terminal and the fourth node;
a second resistive element coupled between the supply voltage terminal and the third node;
a third resistive element coupled between the fourth node and a ground terminal; and
a fourth resistive element coupled between the third node and the ground terminal, and

wherein the amplifier includes an inverting terminal coupled to the fourth node and a non-inverting terminal coupled to the third node.

2. The receiver of claim 1 , wherein the second cutoff frequency is associated with at least one of an element value of the first capacitive element or an element value of the second capacitive element.

3. A receiver comprising:
a first electrode receiving an input signal that includes a noise signal and a bio si mal transmitted through a human body;
a second electrode receiving a reference signal;
a first filter circuit including an inductive element coupled between a first node and a second node, and configured to pass first noise included in the noise signal received through the first node to the second node and to receive the reference signal through the second node, the first node being coupled to the first electrode, the second node being coupled to the second electrode;
a second filter circuit configured to remove second noise included in the noise signal by passing the input signal from the first node to a third node, and to pass the reference signal from the second node to a fourth node; and
an amplifier configured to amplify a difference between a level of the bio signal received through the third node and a level of the reference signal received through the fourth node, and to output data of the bio signal,
wherein a frequency of the noise signal is less than a frequency of the bio signal,
wherein the second filter circuit includes:
a first capacitive element coupled between the first node and the third node;
a second capacitive element coupled between the second node and the fourth node;
a first resistive element coupled between a supply voltage terminal and the fourth node;
a second resistive element coupled between the supply voltage terminal and the third node;
a third resistive element coupled between the fourth node and a ground terminal; and
a fourth resistive element coupled between the third node and the ground terminal, and

wherein the amplifier includes an inverting terminal coupled to the fourth node and receiving the reference signal and a non-inverting terminal coupled to the third node and receiving the bio signal.

4. The receiver of claim 3 , wherein an element value of the inductive element is associated with a frequency of the first noise.

5. The receiver of claim 1 , wherein the first cutoff frequency is associated with an element value of the inductive element.

Assignees

• Electronics & Telecommunications Res Inst

Inventors

• Oh Kwang Il
• Kim Sung Eun
• Kang Tae Wook
• Kim Hyuk
• Park Mi Jeong
• Park Hyung-Il
• Byun Kyung Jin
• Lee Jae-Jin
• Lim In Gi

Classifications

• H03F2200/165

  A filter circuit coupled to the input of an amplifier · CPC title

• H04B13/005 Primary

  Transmission systems in which the medium consists of the human body · CPC title

• H03H11/1291

  Current or voltage controlled filters · CPC title

• H03F3/245

  with semiconductor devices only · CPC title

• H03H7/425

  Balance-balance networks · CPC title