Sinusoidal Phase Shift - Electronic Circuits Projects Diagrams Free

meastwood98 · 6th July 2009, 12:03 PM

Hi,

I am trying to phase shift a sinusoidal signal by a small amount (a degree or two), I am aware I could do this with some ADC and microprocessor. However I would like to do it with some simpler analogue electronics, I have been looking at an "all-pass filter", however my signal will have a varying frequency and therfore this will not work as an "all-pass filter" will only work for a certain frequency. Any ideas?

Any help would be much appriciated?

Thanks,
Mark

ericgibbs · 6th July 2009, 12:48 PM

Quote:

Originally Posted by meastwood98

Hi,

I am trying to phase shift a sinusoidal signal by a small amount (a degree or two), I am aware I could do this with some ADC and microprocessor. However I would like to do it with some simpler analogue electronics, I have been looking at an "all-pass filter", however my signal will have a varying frequency and therfore this will not work as an "all-pass filter" will only work for a certain frequency. Any ideas?

Any help would be much appriciated?

Thanks,
Mark

hi Mark,

What are the frequency limits, min/max and how 'accurate'.??

meastwood98 · 6th July 2009, 01:15 PM

Minimum frequency = 1Hz
Maximum frequency = 100Hz

I would estimate an accuracy of half a degree would be sufficient however i could probably work with a value worse than this.

If you need any more info, let me know.

Thanks,
Mark

ericgibbs · 6th July 2009, 01:39 PM

hi,
This very simple circuit accepts a 0.5Vpk sinewave signal and shifts it a few degrees.

Over the range of 100Hz thru 1KHz the phase shift does vary a little.

Do you use the LTspice simulator.?

meastwood98 · 6th July 2009, 01:53 PM

No, i use NI multisim to simulate circuits. Would it be possible to modify the circuit to run it from a 5v supply?

ericgibbs · 6th July 2009, 01:56 PM

Quote:

Originally Posted by meastwood98

No, i use NI multisim to simulate circuits. Would it be possible to modify the circuit to run it from a 5v supply?

It should be OK at +5V, the output swing will be reduced.

Give it a try,,, the value of the 820R changes the amount of shift, try a few different values.

Lets know how it goes.

meastwood98 · 6th July 2009, 02:16 PM

Sorry, I fogot to mention my signal is a sinusoid that has an offset, its magnitude is 1.2v pk-pk and is offset 2.5v. That circuit works fine for a signal with no offset, can it be modified to work with my signal?

Thanks,
Mark

ericgibbs · 6th July 2009, 03:04 PM

Quote:

Originally Posted by meastwood98

Sorry, I fogot to mention my signal is a sinusoid that has an offset, its magnitude is 1.2v pk-pk and is offset 2.5v. That circuit works fine for a signal with no offset, can it be modified to work with my signal?

Thanks,
Mark

hi Mark,
Is that a 'dc' offset of 2.5V.? , ie: its a 1.2Vppk superimposed on +2.5Vdc level.?

Can you post your Sim circuit.?

meastwood98 · 6th July 2009, 03:08 PM

Yes so the peak value is 3.1v and the trough is 1.9v, I dont have a sim circuit, I just built up your circuit to test it.

ericgibbs · 6th July 2009, 03:10 PM

Quote:

Originally Posted by meastwood98

Yes so the peak value is 3.1v and the trough is 1.9v, I dont have a sim circuit, I just built up your circuit to test it.

hi,
OK, I'll re-look at it.

ericgibbs · 6th July 2009, 04:08 PM

hi Mark,
Just sims OK.
The images are for 1KHz, 500Hz and 100Hz[ with the cct].

The 2nd stage is bring the output to the same level as the input, if required.

Note the fairly high output impedance.

meastwood98 · 7th July 2009, 11:27 AM

From my simulation of the circuit the phase shift is dependant on frequency, are you sure you didnt adjust the value of R when testing it at different frequencies?

ericgibbs · 7th July 2009, 11:37 AM

Quote:

Originally Posted by meastwood98

From my simulation of the circuit the phase shift is dependant on frequency, are you sure you didnt adjust the value of R when testing it at different frequencies?

No I didnt.

meastwood98 · 7th July 2009, 11:40 AM

Ok. Any ideas to where im going wrong?

ericgibbs · 7th July 2009, 11:56 AM

Quote:

Originally Posted by meastwood98

Ok. Any ideas to where im going wrong?

hi,
I have just re-run the sim, this time using a sweep freq, same results as the ones I posted.

Please post the simulation details and circuit that you are using, also with some details of the changes being observed.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar
Title	Starter	Forum	Replies	Latest
Phase shift - Phase Angle	windozeuser	General Electronics Chat	20	20th March 2009 10:39 AM
phase shift	mayeewa	General Electronics Chat	1	27th September 2008 10:40 AM
Phase Shift	Search it	Electronic Projects Design/Ideas/Reviews	2	5th September 2008 02:13 PM
Wired up a phase shift oscillator but I dont think im getting a sinusoidal wave	Qaiphyx	General Electronics Chat	20	21st July 2008 02:37 PM
How Can I detect the phase shift between two sinusoidal signals	Abdullah2121	Electronic Projects Design/Ideas/Reviews	13	1st April 2008 04:37 AM

6th July 2009, 12:03 PM	#1
meastwood98	Sinusoidal Phase Shift Hi, I am trying to phase shift a sinusoidal signal by a small amount (a degree or two), I am aware I could do this with some ADC and microprocessor. However I would like to do it with some simpler analogue electronics, I have been looking at an "all-pass filter", however my signal will have a varying frequency and therfore this will not work as an "all-pass filter" will only work for a certain frequency. Any ideas? Any help would be much appriciated? Thanks, Mark

6th July 2009, 01:15 PM	#3
meastwood98	Minimum frequency = 1Hz Maximum frequency = 100Hz I would estimate an accuracy of half a degree would be sufficient however i could probably work with a value worse than this. If you need any more info, let me know. Thanks, Mark

6th July 2009, 01:39 PM	#4
ericgibbs	hi, This very simple circuit accepts a 0.5Vpk sinewave signal and shifts it a few degrees. Over the range of 100Hz thru 1KHz the phase shift does vary a little. Do you use the LTspice simulator.? Attached Thumbnails __________________ Eric " Good enough is Perfect " I will NOT answer PM's requesting technical help, please use the Forum PIC tutorials: Nigel's www.winpicprog.co.uk/ Bill's: www.blueroomelectronics.com/

6th July 2009, 01:53 PM	#5
meastwood98	No, i use NI multisim to simulate circuits. Would it be possible to modify the circuit to run it from a 5v supply?

6th July 2009, 02:16 PM	#7
meastwood98	Sorry, I fogot to mention my signal is a sinusoid that has an offset, its magnitude is 1.2v pk-pk and is offset 2.5v. That circuit works fine for a signal with no offset, can it be modified to work with my signal? Thanks, Mark

6th July 2009, 03:08 PM	#9
meastwood98	Yes so the peak value is 3.1v and the trough is 1.9v, I dont have a sim circuit, I just built up your circuit to test it.

6th July 2009, 04:08 PM	#11
ericgibbs	hi Mark, Just sims OK. The images are for 1KHz, 500Hz and 100Hz[ with the cct]. The 2nd stage is bring the output to the same level as the input, if required. Note the fairly high output impedance. Attached Thumbnails __________________ Eric " Good enough is Perfect " I will NOT answer PM's requesting technical help, please use the Forum PIC tutorials: Nigel's www.winpicprog.co.uk/ Bill's: www.blueroomelectronics.com/ Last edited by ericgibbs; 6th July 2009 at 04:09 PM.

7th July 2009, 11:27 AM	#12
meastwood98	From my simulation of the circuit the phase shift is dependant on frequency, are you sure you didnt adjust the value of R when testing it at different frequencies?

7th July 2009, 11:40 AM	#14
meastwood98	Ok. Any ideas to where im going wrong?