Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[SOLVED] Convert Analog 0 to -3v pulse to +5 to -5

Status
Not open for further replies.
N

niloc

Newbie level 2
Joined
Jan 7, 2015
Messages
2
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
17
Hi everyone,

i have searched the forum and found several threads that discuss the opposite, ie +/- 5 to 0-5v etc but haven't found something for my particular problem.

I am just after some direction in solving a design for a video interface to an ADC.

The video pulse is 0 to -3v and I need to convert the pulse to +5v to -5v to give full resolution at the ADC.

I have considered having a two stage op amp design with a dc offset on a Voltage Follower at 1st stage and then a Non Inverting Second Stage with a little gain to give full voltage swing. However the amount of DC Offset required is quite high, so I thought I would ask for some ideas and feedback here.

Does anyone have any suggestions?
 

I would have a level shifter [to shift to +-1.5V] then a non inverting gain of about 3.3
 
  • Like
Reactions: niloc

    N

    niloc

    Points: 2
    Helpful Answer Positive Rating
Or use the opAmp with 4 precision resistors and a -1.5V reference voltage: diff-amp_lvl-shifter.png

The opAmp's supply voltages have to be larger than its max. output voltages, e.g. ±8 or ±10V .
 
  • Like
Reactions: niloc

    N

    niloc

    Points: 2
    Helpful Answer Positive Rating
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top