To shift dc offset sine wave

Status
Not open for further replies.
V

vrvrao

New Member
Hello every one,

I have an sine wave of -15v to 15v ( dc-offset is 0 v) and i need to shift it to a sine wave of 0 - 3v with dc offset of 1.5v.

i taught of using diodes but its cutting off the negative half.

as am new in to electonics,So i dont know much about it.

It would be very helpfull for me if u can give some ideas.

thanks
 
hi,
Its possible to do that using a simple operational amplifier circuit.

It would help you could tell us more about the project, whats the source of the +/-15Vsine and whats the +/-1.5Vsine wave going to be used for.??
 
hi ,

thanks for reply.

+/-15v supply is from inverter and 0- 3v voltage is to fed controller after converting to pulse.
 
hi,

can we use lt1632 op amp and can we use 28 v supply voltage for the same ckt.

the pulse required is same 0 - 3v with freqency of 2khz.
 
vrvrao said:
hi,

can we use lt1632 op amp and can we use 28 v supply voltage for the same ckt.

the pulse required is same 0 - 3v with freqency of 2khz.
Click to expand...

hi,
The LT1632 looks ok.

You could get a 0/3V square wave directly from a comparator, no need for a level shift stage.
 
hi,

i have an doubt, can we shift the sine wave without adding an voltage reference like V+ at input.
 
vrvrao said:
hi,

i have an doubt, can we shift the sine wave without adding an voltage reference like V+ at input.
Click to expand...

Thats not easily done.

The voltage reference is only the same +5V as the supply to the OPA.
 
vrvrao said:
hi,

i have an doubt, can we shift the sine wave without adding an voltage reference like V+ at input.
Click to expand...

I am not completely sure what you are asking here, but yes it is possible to raise a sinewave so that it is always above 0v but still a sine shape.

Have a look at my attached sketch.

You could also make the sinewave completely negative by reversing the diode.

There are limits to this technique,
there will be a little bit of offset about one diode drop (0.6v), which may not be a problem depending on what you want to use the signal for.
Also, if you want to use this signal as a clock for something, you will have to use something with a Schmitt circuit or a comparator as Eric has suggested in order to give a fast rise time to the clock. Otherwise you may get some strange effects due to noise and the slow risetime of the sinewave.

JimB
 
Status
Not open for further replies.

Similar threads

B
  • Question
Sine to square wave conversion
2
Replies
27
Views
6K
bob4bvm
B
  • Question
An odd issue with half wave rectifier.
Replies
6
Views
2K
psecody
S
Varying Speed AC Generator to Steady DC
2 3
Replies
48
Views
5K
Soul21
S
S
  • Question
isolated DC-DC convertor and mosfet driver
2
Replies
28
Views
4K
shortbus=
S
E
  • Question
Phase Shift Oscillator Circuit
Replies
18
Views
3K
rjenkinsgb
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…