By: Chenchen Qi Douglas Ciha John Hogan

Slides:



Advertisements
Similar presentations
Operational Amplifiers
Advertisements

Op-Amp- An active circuit element designed to perform mathematical operations of addition, subtraction, multiplication, division, differentiation and.
BIOPOTENTIAL AMPLIFIERS
ECG Biopotential Amplifier ASHLEY MULCHRONE ZEXI LIU.
ENTC 4350 HOMEWORK SET 3 Chapter 5.
NONIDEAL OP AMP CIRCUITS. Objective of Lecture Describe the impact of real operational amplifiers on the models used in simulation and on the design approaches.
Announcements Troubles with Assignments… –Assignments are 20% of the final grade –Exam questions very similar (30%) Deadline extended to 5pm Fridays, if.
Introduction to the OP AMP
Topic 3: Op-Amp: Golden Rules of OP Amp 1.i in =0, no current flow into op amp. 2.V + =V - Typically one end of op amp is connected to ground, therefore,
Vital Signs Monitor UConn BME 4900 Vital Signs Monitor Purpose As the population ages, many people are required by their doctors to take vital signs.
Example Problem You are measuring the EEG of a patient and accidently choose two different types of electrodes for EEG lead. One of them has a source impedance.
Operation Amplifier. Golden Rules of OP Amp 1.i in =0, no current flow into op amp. 2.V + =V - Typically one end of op amp is connected to ground, therefore,
© 2012 Pearson Education. Upper Saddle River, NJ, All rights reserved. Electronic Devices, 9th edition Thomas L. Floyd Electronic Devices Ninth.
Introduction to Op Amps
UNIVERSAL COLLEGE OF ENGG. AND TECH. ANALOG ELECTRONICS.
1 Electronic Circuits COMMON EMITTER CIRCUITS. 2 Electronic Circuits AMPLIFIERS CAN BE CLASSIFIED AS EITHER: VOLTAGE AMPS POWER AMPS AMPLIFIERS CAN BE.
Part I: Amplifier Fundamentals
Chapter 8 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Introduction to Op Amp Circuits ELEC 121. April 2004ELEC 121 Op Amps2 Basic Op-Amp The op-amp is a differential amplifier with a very high open loop gain.
EKT314/4 Electronic Instrumentation
Active Filters. This is not in the lab manual While the circuit that will be used is very similar to the one described in the lab manual, the steps in.
Differential Amplifier
1 ECG Signal Make-up. 2 Biopotential Requirements n High Input Impedance –Minimum loading of the signal being measured –Minimum 10M  n Input circuit.
EE 1270 Introduction to Electric Circuits Suketu Naik 0 EE 1270: Introduction to Electric Circuits Lecture 13: Operational Amplifiers Part 2 Chapter 5.
St Columba’s High School Electricity and Electronics Op-amps.
Operational Amplifiers AC Power CHAPTER 8. Figure 8.2, A voltage amplifier Figure 8.2 Simple voltage amplifier model Figure 8.3.
Module 4 Operational Amplifier
Biomedical Instrumentation I
Vital Signs Monitor UConn BME 4900 Vital Signs Monitor Purpose As the population ages, many people are required by their doctors to take vital signs.
Fundamentals of Electric Circuit Analysis, by Clayton Paul Copyright 2000 © John Wiley & Sons. Inc. All rights reserved. Figure 4.1 An op-amp schematic:
EE 1270 Introduction to Electric Circuits Suketu Naik 0 EE 1270: Introduction to Electric Circuits Lecture 13: Operational Amplifiers Part 1 Chapter 5.
ECG Measurement System By Nick Rose Under guidance of Dr. Jack Ou Summer 2012 Built off of Chia-Hung Chen, Shi-Gun Pan, and Peter Kinget’s design for an.
TUTORIAL QUESTIONS – OSCILLATOR
Other Transistor Circuits
Preamplifiers : BGA 2003 (Silicon MMIC amplifier): In general, the function of a preamp is to amplify a low-level signal to line-level. DESCRIPTION: Silicon.
Operational Amplifiers The operational amplifier, also know as an op amp, is essentially a voltage amplifier with an extremely high voltage gain. One of.
Dual PD Amp Circuit Board Test Results By Alexa Staley LIGO G v1 1.
1 Amplifiers. Equivalent Circuit of a Voltage Amplifier G vo V i IoIo RoRo VoVo ViVi RiRi IiIi Amplifier ViVi VoVo (a) Black Box Representation.
1 ECE 313 n Microelectronic Circuits –4th edition n Sedra & Smith.
Audio Systems. Introduction Audio systems are designed to give an output frequency within the audible range for a human being (20 Hz to 20KHz). Below.
The ECG UConn BME 290. Buffers What is a buffer? –Non-inverting amplifier with a gain of 1 Why use a buffer? –Buffers provide a high input impedance.
Lecture 2: Filters.
Portable Real Time ECG Design
1 Operational Amplifiers n Ideal Op-Amp –input terminals –differential gain, open-loop gain.
OP-AMPs Op Amp is short for operational amplifier. An operational amplifier is modeled as a voltage controlled voltage source. An operational amplifier.
Module 2 Operational Amplifier Basics
Operational amplifier
Biomedical Instruments Design Biopotential Amplifiers
Electronic Devices Ninth Edition Floyd Chapter 14.
Open book, open notes, bring a calculator
(4) Filters.
Operational Amplifier
ECE 1270: Introduction to Electric Circuits
Basic MOS Amplifiers: DC and Low Frequency Behavior
Quiz: Driving a SAR ADC with a Fully Differential Amplifier TIPL 4103 TI Precision Labs – ADCs Created by Art Kay.
ECE 1270: Introduction to Electric Circuits
The open loop gain of this op-amp is 105 and the bandwidth is 10 Hz
UNIT-5 Design of CMOS Op Amps.
Block Diagram Nikon (on-focal ) microscope Electronic Box NI: DAQ card
Department of CNET Electronic Circuit II
Introduction to the OP AMP
دکتر سعید شیری & کتابMICROELECTRONIC CIRCUITS 5/e Sedra/Smith
Introduction to the OP AMP
Amplifiers: A Bio amplifier is an electrophysiological device, a variation of the instrumentation amplifier, used to gather and increase the signal integrity.
Operational Amplifier (Op-Amp)-μA741
Biomedical Instruments Design Biopotential Amplifiers 1.
TUTORIAL A filter shown in Figure Q1 has values of R1 = R2 = 12kΩ, C1 = 0.01µF, C2 = 0.02µF and RF = 1k Ω. (a) Explain the type and function.
Department of CNET Electronic Circuit II
Department of CNET Electronic Circuit II
Department of CNET Electronic Circuit II
Presentation transcript:

By: Chenchen Qi Douglas Ciha John Hogan ECG Amplifier By: Chenchen Qi Douglas Ciha John Hogan

Considerations Preamplifier Filter Driven Right Leg Circuit

Preamp Specs Voltage range: 1.9 - 3.8 V Input signals: Allowed Gain: Middle voltage: 2.85 V 0.95V from center to each saturation point Input signals: DC offset voltage range: ±0.3 V Range of linear operations of input: ±5 mV Allowed Gain: 0.95/0.305 V = 3.115

Preamp Circuit G = 1 + 49.4k/RG Choose RG = 25 kΩ G = 3 Figure 1. LT1167 pin diagram [1]

Filter Observed ECG frequencies: Used 0.5 – 50Hz bandwidth Clinical Bandwidth: 0.05 – 100Hz Monitoring Bandwidth: 0.5 – 50Hz Used 0.5 – 50Hz bandwidth All that is needed to construct a monitor Naturally avoids 60Hz signal noise

Passive Band-pass Filter Figure 2. Band-pass fitter [2] We want fc,1 = 0.5 Hz and fc,2 = 50 Hz f0 = 1/ (2πRC) Choose R1 = R2 = 1 MΩ C1 = 3.18 nF C2 = 318 nF

Driven Right Leg Circuit Figure 3. Driven right leg circuit [3]

Driven Right Leg Circuit Patient not connected to ground Right leg connected to auxiliary amp output Connected through a buffer and two, 50kΩ resisters, for patient safety 50kΩ 50kΩ Figure 4. Right Leg Lead [4]

References [1]https://ay14- 15.moodle.wisc.edu/prod/pluginfile.php/75950/mod_res ource/content/1/LT1167%20instr%20amp.pdf [2]http://www.electronics-tutorials.ws/filter/filter_4.html [3]15.moodle.wisc.edu/prod/pluginfile.php/72917/mod_r esource/content/1/BME%20DSP%20textbook.pdf [4]https://ay14- 15.moodle.wisc.edu/prod/pluginfile.php/76349/mod_res ource/content/1/DRL-TexasInst-2011.pdf

Questions?