Evaluating power consumption

Table of Contents

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details <https://www.gnu.org/licenses/>.

This code was developed by Miodrag Bolic for the book PERVASIVE CARDIAC AND RESPIRATORY MONITORING DEVICES: https://github.com/Health-Devices/CARDIAC-RESPIRATORY-MONITORING

We would like to acknowledge:

[1] G. Dekkers, F. Rosas, S. Lauwereins, S. Rajendran, S. Pollin, B. Vanrumste, T. van Waterschoot, M. Verhelst and Peter Karsmakers, �A multi-layered energy consumption model for smart wireless acoustic sensor networks,� KU Leuven, Tech. Rep., December 2018. for providing the Matlab code. All the equations are from their paper.

% Changing the path from main_folder to a particular chapter
main_path=fileparts(which('Main_Content.mlx'));
if ~isempty(main_path)
    %addpath(append(main_path,'/Chapter2'))
    cd (append(main_path,'/Chapter4/PowerEstimation'))
    addpath(append(main_path,'/Service'))
end
SAVE_FLAG=0; % saving the figures in a file

Introduction

A/D Converter

% From paper [1]

T=1;

channels=1;

Nadc= 12 ;% # ADC resolution [bit]

fs=10000;

Ts=1/fs;

FOM= 100*1e-13*10^3; % # [mJ/conv]

% ADC consumption

Padc = 2^Nadc * fs * FOM % [mW] - eq. 10

Padc = 0.4096

Eadc = T*Padc*channels; % [mJ] = [s]*[mW] - eq. 9

% Based on the data sheet for sigma delta ADS1114 from TI

i_oper=0.15; % [mA]

i_power_down=1e-3; % [mA]

conversion_time=1/1000; % [s]

Vdd=3; % [V]

Eadc=Vdd*(i_oper*conversion_time+i_power_down*(Ts-conversion_time));

Padc=Eadc/Ts %

Padc = 4.4730

% Based on the data sheet for sucessive approximation AD7684 from Analog Devices

i_oper=0.56; % [mA]

i_power_down=1e-6; % [mA]

conversion_time=10e-6; % [s]

Vdd=3; % [V]

Eadc=Vdd*(i_oper*conversion_time+i_power_down*(Ts-conversion_time));

Padc=Eadc/Ts

Padc = 0.1680

% Ploting power over sampling rates and Vdd

Vdd1=[2.7, 5];

i=1:1000;

fs1=100*i;

Ts1=1./fs1;

i_oper1=[0.56, 0.8];;

Padc1(1,:)=Vdd1(1)*(i_oper1(1)*conversion_time+i_power_down*(Ts1-conversion_time))./Ts1;

Padc1(2,:)=Vdd1(2)*(i_oper1(2)*conversion_time+i_power_down*(Ts1-conversion_time))./Ts1;

loglog(fs1/1000,Padc1)

title('Power consumption of A/D converter AD7684')

xlabel('Sampling frequency (ksps)')

ylabel('Power consumption (mW)')

grid on

legend(['2.7V'], ['5V'])

annonation_save('',"Fig4.20.jpg", SAVE_FLAG);