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209 Threads found on edaboard.com: **Wave Sin**

You can have look at the basic working theory @ Its implemented for LPC2148 but the underlying working is the same. You need to generate or use a hardcoded **sin**e lookup table which feeds values to your PWM block and at the PWM output use a filter which acts a D

Microcontrollers :: 04-06-2017 12:19 :: Power_user_EX :: Replies: **9** :: Views: **1180**

Hello,
How to build **sin** **wave** oscillator for learning??

Analog Circuit Design :: 12-01-2016 07:45 :: RETGT :: Replies: **4** :: Views: **457**

Hello,
Doing FFT exercises in Matlab I've discovered that for some frequencies (defined by k) the FFT of quantized **sin** **wave** alternates '0'.
For k I used primary numbers.
With k = 11, 13, 17, 19, 23, 29, 31, 37 it's Ok
With K = 3, 5, 7, 41, 53, 67, 101, 127 FFT alternates '0'.
Any ideas ?
Thanks in advance.
Pavel.
clos

Digital Signal Processing :: 11-05-2016 19:13 :: pavel47 :: Replies: **2** :: Views: **518**

Hi My friends
i need pure **sin** **wave** that Fixed at 1khz But we have two limitation
1- i need 500 mA Current
2- i Can not use transistor for that current because in some of method that transistor going to hot .
power supply is 12Vdc
amplitude near 5 V
Thanks

Analog Circuit Design :: 07-19-2016 00:19 :: nima_1981 :: Replies: **5** :: Views: **395**

Hello,
I am building this circuit in LT spice but it is not giving **sin** **wave** why?

Analog Circuit Design :: 06-22-2016 06:20 :: RITESH KAKKAR :: Replies: **9** :: Views: **480**

Hello,
I have notices when we connect the supply to transformer like inductor there is back Voltage/EMF generated which is higher than the applied voltage also depend on the frequency of supply and Capacitor value inductor value and resistance.
why does it happen?
the reason behind it when we remove capacitor it does not happen?

Analog Circuit Design :: 06-08-2016 07:17 :: RITESH KAKKAR :: Replies: **21** :: Views: **1057**

I would like to have a 5Watt **sin** generator with a variable frequency between 100 KHz and 10MHz.
Could you tell us a little more about the application? What voltage does the **sin**e **wave** need to be at? What kind of load are you driving? When and how does the frequency need to change?

Elementary Electronic Questions :: 03-04-2016 19:47 :: KD494 :: Replies: **2** :: Views: **495**

Hi all,
I'm new in u**sin**g DPI methodology to import C function with ModelSim
I'm writing a SystemVerilog code that generate **sin**e **wave** it useid "**sin**" function that i had imported u**sin**g :
import "DPI-C" pure function real **sin** (input real rTheta);
but i'm when simulating my (...)

ASIC Design Methodologies and Tools (Digital) :: 03-01-2016 14:39 :: abdoo :: Replies: **0** :: Views: **833**

Hello.
I am working on a dc-ac inverter. My setup is as follows: I have a DC battery of 48 volts from which I want to generate a 24V **sin** **wave** of with a 50Hz frequency. My design is a microcontroller based design where I'm u**sin**g an STM32F4 type uC. I have 4 transistors (along with a driver that drives them) that make up my H-bridge. (...)

Power Electronics :: 02-20-2016 16:47 :: powergeek :: Replies: **0** :: Views: **371**

You did not informed exctly with which of those schematic were made your experiments.
Moreover, this piece of code do not make sense: You are getting the inverse of the same function, f-1(f(t)):
carrier = ((2 / PI) * a**sin**(**sin**(2 * PI * 3000 * t))); //triangular **wave**
I'm not experienced in Arduino, but why

Power Electronics :: 02-20-2016 13:58 :: andre_teprom :: Replies: **11** :: Views: **1701**

Hi,
I draw a simple injection locked frequency divider. Parameters in design are as follows:
Technology: tsmc 0.18um RF.
M0,M1: NMOS Width/Length/NF(number of fingers)=3um/0.18um/6
M2: NMOS Width/Length/NF=3um/0.18um/9
Inductor: center tapped. Width/Space/Radius=9um/2um/51.8um
Input: 26GHz **sin** **wave**, peak to peak voltage swing 0.2V

Analog Circuit Design :: 11-17-2015 09:23 :: teem :: Replies: **0** :: Views: **288**

very-good Pure-**sin**-**wave** Inverter Technology transfer . With latest technology and reliable with low cost .
These specifications are in general conflicting, which are also affected by the power range that you had not mentioned yet.

Power Electronics :: 08-17-2015 15:58 :: andre_teprom :: Replies: **12** :: Views: **966**

I would like to model signal noise from an electromagnet. I think to model the noise as a voltage **sin** **wave**. But how do I know what noise I need to filter out?
Any help would be appreciated.
Thanks in advance.

PCB Routing Schematic Layout software and Simulation :: 04-27-2015 22:14 :: RushingDaGawd :: Replies: **0** :: Views: **370**

Hi
I am looking for IC or circuit which can generate a phase locked **sin** **wave** , in phase with the Analog PAL TV sub-carrier.
Something like MC44144, and if it can generate in phase and quadrature phase it will be great.
the purpose is adding color overlay on Analog TV Picture, u**sin**g the composite signal.
I found and old post with the (...)

Analog Circuit Design :: 03-26-2015 11:08 :: alzomor :: Replies: **0** :: Views: **437**

I agree that the lousy old LM324 opamp has trouble above 2kHz.
A 200Hz square**wave** has harmonics above 2kHz.

Analog Circuit Design :: 03-16-2015 16:18 :: Audioguru :: Replies: **32** :: Views: **2263**

yes...got the answer...and what about the formulae for **sin**e **wave**
What about it?

Digital Signal Processing :: 11-24-2014 13:00 :: barry :: Replies: **7** :: Views: **943**

It looks like a harmless warning that you get due to how the BRAMs are used in those DDS cores you use for your **sin**e **wave**s.
First step is to read that Xilinx Answer Record 39999 to be sure what that is about. Second step is to make a small testbench for your design to see if you get the expected **sin**e **wave**s and multiplied (...)

PLD, SPLD, GAL, CPLD, FPGA Design :: 10-19-2014 10:51 :: mrflibble :: Replies: **2** :: Views: **607**

that hysteresis curve is for **sin** **wave**. what is your plot for square **wave** and what do you expect from that?
I didn't plot resistance of memristor but I think you should perform dc sweep.

PCB Routing Schematic Layout software and Simulation :: 07-25-2014 05:44 :: ahmad1954 :: Replies: **8** :: Views: **1308**

I was following this tutorial
Written by tahmid,
I am confused with couple things,
Why TOP value is chosen as 999 and not something else (like 1200 or 499) is this just to set the PWM frequency to 16 Khz or is there some oth

Microcontrollers :: 05-12-2014 21:47 :: AtMega32 :: Replies: **22** :: Views: **9079**

I need to excite the coil on the left of the model with **wave** 5***sin**(2*PI*f*t) and see the effects on the others. How can I do this. I have attached the model file
106994
and a screen shot of model.
106995

Electromagnetic Design and Simulation :: 07-04-2014 06:02 :: Alvi99 :: Replies: **0** :: Views: **727**

Q=CV is the fundamental nature of capacitance
I=dQ/dt=CdV/dt
and for a **sin**e **wave** v(t)=**sin**(wt) (w being omega)
d(**sin**(wt))/dt = w*cos(wt)
so I(t)=C*w*cos(wt)
There is your w term as a scale factor in I, impedance is
dV/dI, so w (omega) in the denominator and there you go.

Elementary Electronic Questions :: 06-27-2014 18:09 :: dick_freebird :: Replies: **2** :: Views: **576**

Hi to All,
I have 2 questions about PAR.
1) Is it right to say that the constant envelope modulations such as FSK or GMSK PAR value is equal to 0dB?
2) Crest factor for a **sin** **wave** is 3.01 Crest factor for a FM modulated signal is 0dB.

RF, Microwave, Antennas and Optics :: 06-22-2014 05:52 :: nazanin.gharib62 :: Replies: **0** :: Views: **862**

First u need to create a block which generates the required signal. Signals can be **sin** **wave**(which can be generated u**sin**g lookup tables or Cordic method), ramp signal, or you can search the internet for the popular tones and their generation equation. The previous link shared by udayan92 is helpful.
Afterwards a proper testbench is needed to (...)

PLD, SPLD, GAL, CPLD, FPGA Design :: 04-17-2014 11:19 :: sherif123 :: Replies: **3** :: Views: **693**

i need verilog code of **sin**e **wave** generator....i tried with cordic algorithm but i cant able to proceed....plzzz help

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 03-31-2014 20:29 :: rids1 :: Replies: **1** :: Views: **1700**

Digital Signal Processing :: 11-07-2013 07:15 :: emresel :: Replies: **4** :: Views: **469**

for a **sin**usoidal signal:
y = A **sin**( 2 pi freq + phase)
where
A=the amplitude,
freq = frequency. (Gives you the number of cycles per second)
phase in a simple way tells you at what angle does the **sin**e **wave** starts.
The same concept applies for any periodic signal.
Again trying to put it in simple terms:
Signals (...)

RF, Microwave, Antennas and Optics :: 10-02-2013 17:17 :: albert22 :: Replies: **4** :: Views: **457**

Idc_r1 = Vdc_r1 / R1
But V_r1 is a **sin**e**wave** tip:
V_r1 (x) = Vpeak * COS (x) - Vout , if -a ≦ x ≦ a where a = ACOS ( Vout / Vpeak )
V_r1 (x) = 0 otherwise
Vdc_r1 = 2 / (2*PI) * ∫ V_r1 (x) * dx from x=0 to x=a
Vdc_r1 = 1 / PI * , from x=0 to x=a
Vdc_r1 = 1 / PI * [Vp

RF, Microwave, Antennas and Optics :: 08-03-2013 05:59 :: jiripolivka :: Replies: **15** :: Views: **1406**

I want to know the relation between sampling frequency (Hz) and sampling rate (sample per second).
For example, a 1 Hz **sin** **wave** sampled at 8000 samples per second. Each cycle of the 1Hz tone will span all 8000 samples (**sin**ce its period is 1 second). Thus sampling period will be 1/ (8000-1) s
Or sampling frequency will be 8000-1 ≈ (...)

Analog Circuit Design :: 06-29-2013 16:09 :: Osawa_Odessa :: Replies: **13** :: Views: **48857**

i need circuit diagram for generate **sin** **wave** 50 hz u**sin**g xr2206
and a circuit for generate triangle 5KH--15kH
and i eant to adjust the amplitude and frequency of each other as i want
I made a **wave**form generator u**sin**g an XR2206.
The IC can produce three **wave**forms simultaneously, and (...)

Power Electronics :: 06-17-2013 21:53 :: BradtheRad :: Replies: **4** :: Views: **1260**

Hi,
I'm looking to turn multi **wave** data (typically low frequency, 0.5Hz carrier **wave** -> 5Hz as harmonics) into its harmonic **wave**forms. essentially its an applied **wave**form in the form (0.1***sin**(t*pi)+0.06***sin**(t*3*pi)+0.04***sin**(t*5*pi)...etc)) and a response from a (...)

Digital Signal Processing :: 04-19-2013 14:04 :: Rheologist :: Replies: **0** :: Views: **633**

Hello Mr. Mithun, To generate pure **sin**e with 16F73 you must need a lookup table u**sin**g calculated **sin**e point. Because 16F series doesn't have enough speed to calculate Multiplication for (i=0; i<15; i++)
{
teta = ( (float) i / 15 ) * 3.14159;
sample = (int) (255 * **sin** ( teta ));
PWM1_Set_Duty(sample);
}
Try this lookup

Analog Circuit Design :: 04-11-2013 12:45 :: RONY CHAKRABORTY :: Replies: **2** :: Views: **3072**

Hi,
I am working on a project for which I need to generate two **sin** **wave** signal with 1F and 6F frequencies . F can change from 5HZ - 150Hz.
I thought to use some VCOs in combination voltage gain ckts to achieve this but could not find a **sin** VCO to work in HZ frequency range.
I don't need **sin** **wave** to put (...)

Analog Circuit Design :: 03-07-2013 15:11 :: umesh49 :: Replies: **8** :: Views: **899**

if the frequency of **sin** **wave** change, signal compressed.

Digital Signal Processing :: 02-20-2013 19:34 :: ahmad1954 :: Replies: **3** :: Views: **550**

I appologize i am unable to understand your requirement clearly:
do you want to convert **sin**osoidal output of an oscilator to square **wave** clock output with minimal phase noise/jitter?

Analog Integrated Circuit (IC) Design, Layout and Fabrication :: 02-04-2013 11:21 :: asimlink :: Replies: **2** :: Views: **733**

Hello!
I have a silly question! :)
If I generate a **sin** **wave** with the amplitude of 1V and play it in Matlab, will I see on the soundcard output the same amplitude of 1V (of course u**sin**g an osciloscop) ?
Thanks in advance!

Digital Signal Processing :: 01-30-2013 18:57 :: axell89 :: Replies: **0** :: Views: **669**

Can you suggest me a method to print 1 Hz **sin** **wave** on the Glcd component?
NOTE:
Glcd is controlled u**sin**g PIC18F4525.
**sin** **wave** is converted into digital data and saved in continuous locations.
The digital data should be printed in the glcd component.

Microcontrollers :: 01-13-2013 11:26 :: snishanth512 :: Replies: **1** :: Views: **567**

pls help me ... if any modification is required... am currently building a 350 va **sin**e **wave** inverter with series based charge regulator

Professional Hardware and Electronics Design :: 01-08-2013 04:13 :: meshoaib89 :: Replies: **1** :: Views: **731**

Why do you say that?
The question title (and also the text) says "multiplying a **sin** with a DC to get a square **wave**". That's at least unclear, because it involves an amplitude measurement with unspecified behaviour. Possible are e.g. peak detector, RMS detector. But which filter characeristic?

Analog Circuit Design :: 12-11-2012 06:54 :: FvM :: Replies: **5** :: Views: **500**

Hi! I'm getting stock on creating a LUT for **wave**form in this case **sin** **wave**... what about when I want to refer it to let say 2.5V.
Here you are examples .
The outputted data is for the DAC input, which output voltage arrangement is out of the synthesable V

PLD, SPLD, GAL, CPLD, FPGA Design :: 12-10-2012 16:55 :: Aser :: Replies: **5** :: Views: **1103**

Dear all,
I am was not convinced or may be could not understand the correlation in matlab i.e. xcorr function.
So to test I simple made two exactly similar **sin**e **wave** without any delay, and it gives me delay of 21.
I cannot understand why. please first see the code below
fo=200; fs=2500;
t=0:1/fs:.008;
x=**sin**(2*pi*fo*t);
y=x; %n

Digital Signal Processing :: 12-10-2012 13:57 :: syedshan :: Replies: **1** :: Views: **597**

how to generate variable frequency **sin** **wave** in pic

Microcontrollers :: 12-05-2012 18:15 :: waqas ikhtiar :: Replies: **1** :: Views: **657**

You will have very poor efficiency (very high losses) if you do manage convert the square **wave** output to **sin**e **wave** u**sin**g some sort of filter.
It's better if you can redesign your circuit u**sin**g **sin**usoidal pulse width modulation (SPWM).
Agreed. As I said, it's pretty difficult to turn a (...)

Professional Hardware and Electronics Design :: 11-28-2012 15:56 :: barry :: Replies: **151** :: Views: **18945**

hi all,
Please can any one tell me how can write this matlab instruction "u = 0.5***sin**(2*pi*ftest)" for a **sin**e **wave** in 24 bit fixed point representation?
thanks a lot,
Noura

Elementary Electronic Questions :: 11-06-2012 07:47 :: noura7 :: Replies: **0** :: Views: **798**

Hello All,
I am trying to generate a **sin**e **wave** with frequency 5GHz with 0.4V offset and 0.4V amplitude. This is what I do.
// Testbench
`timescale 1ps/10fs
import "DPI" pure function real **sin** (input real rTheta);
module testbench;
// Declarations
parameter sampling_time =1;
const real pi = 3.1416;
bit (...)

Elementary Electronic Questions :: 10-09-2012 18:46 :: drk15 :: Replies: **0** :: Views: **1958**

Hi
i want to generate a 20kHz spwm for an inverter, so i need a 20Khz triangular and a 50Hz **sin** **wave**
but i don't now how to generate these **wave**forms.
anyone can help me please?
thanks for your help
Farzam
Hi Farzam
This is too easy ! for triangle **wave** , you can easily use a relaxation oscillator , which is based on (...)

Power Electronics :: 10-07-2012 21:41 :: goldsmith :: Replies: **5** :: Views: **1837**

%program to generate **sin**e **wave**
f= input('enter the frequency in hertz of the **sin**e **wave**');
t=0:.0001:5;
y=**sin**(2*pi*f*t);
plot(t,y);
ylabel ('Amplitude');
xlabel ('Time Index');
TITLE ('**sin**e **wave**');
%with samples
t = ; % Time Samples
f = 500; (...)

Digital Signal Processing :: 10-05-2012 18:03 :: pakitos :: Replies: **3** :: Views: **738**

Hi all;
i want to measure the frequency of a **sin** **wave** passed through HEF4093BE NAND gate Schmitt trigger to be furnished and this frequency is feeded into pin RA2 of PIC16F877A; and from this pin i want to read the frequency. i made the following code for that purpose but instead of reading the frequency it is counting the numbers with a very high

Microcontrollers :: 09-10-2012 08:33 :: Qaisar Azeemi :: Replies: **4** :: Views: **791**

Hi,
I'm trying to generate **wave**s of the form, p = a*cos(theta)*exp(i*w*t), where t is the time, w is the frequency and theta is just an angle. In my VI (attached),
I used exp(i*w*t) = cos(w*t)+i***sin**(w*t) and formed this u**sin**g the Re/Im to Complex Function. And I used four different values of theta.
However, when I output the values (...)

Microcontrollers :: 06-19-2012 20:01 :: abr_pr90 :: Replies: **0** :: Views: **615**

I wish to have spacio-temporal accuracy so am u**sin**g a continuous **wave**let ttransform. I have noticed that when u**sin**g fft on a **sin** **wave** signal I get a nice spike around the frequency, but when doing a cwt (with cgau6 **wave**let - a **sin** **wave** combined with a (...)

Digital Signal Processing :: 06-15-2012 01:00 :: chinnyreckon :: Replies: **0** :: Views: **519**

Hi,
I have a question that seems simple but is surrounding my mind. From my understanding, a signal can be represented by its in-phase and quadrature componentes (which are low pass signals). The relationship is the following
A(t)*cos(wt +phi(t) ) = si(t) * cos(wt) - sq(t) * **sin**(wt) , being si(t) and sq(t) the associated I and Q signals resp

RF, Microwave, Antennas and Optics :: 06-01-2012 17:34 :: 0xEthan :: Replies: **1** :: Views: **855**

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