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Level shifter with some kind of tracking/follower???

Discussion in 'Electronic Basics' started by royalmp2001, Mar 21, 2007.

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  1. royalmp2001

    royalmp2001 Guest

    I need a simple circuit that can convert/shift a variable amplitude AC
    square wave (+1V and -1V to +10V and -10V) so that the most negative
    portion of the signal is always +0.25V above ground.

    So a signal oscillating about +1V and -1V would result in +2.25V and
    +0.25V.
    A signal oscillating about +5V and -5V would produce +10.25V and
    +0.25V
    And a signal oscillating about +10V and -10V would produce +20.25V and
    +0.25V.

    Any ideas, folks??
    Thanks
     
  2. Jamie

    Jamie Guest

    use a diode for the + side and apply a little fix voltage
    for the +0.25
     
  3. Chris

    Chris Guest

    Hi, Royal. You want simple? Here's simple (view in fixed font or M$
    Notepad):

    |
    | || +
    | .-------||----o-------o
    | | || |
    | | 1uF |
    | / \ |
    | ( ~ ) 1N5819 V Vo
    | \_/ -
    | | |
    | | |
    | | |
    | '-------------o-------o
    | -
    (created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)

    Use a non-polarized cap for C. The 1N5819 is a 40V schottky rectifier
    with a forward voltage drop of about 0.25V or so. This will shift the
    DC level so the output coltage is always positive.

    Not perfect, but close enough? It's sure simple.

    Cheers
    Chris
     
  4. John Fields

    John Fields Guest

    ---
    Almost. ;)

    Version 4
    SHEET 1 880 680
    WIRE 0 176 -64 176
    WIRE 112 176 64 176
    WIRE -64 224 -64 176
    WIRE 112 240 112 176
    WIRE -64 352 -64 304
    WIRE 112 352 112 304
    WIRE 112 352 -64 352
    WIRE -64 384 -64 352
    FLAG -64 384 0
    SYMBOL voltage -64 208 R0
    WINDOW 3 24 104 Invisible 0
    WINDOW 123 0 0 Left 0
    WINDOW 39 0 0 Left 0
    SYMATTR InstName V1
    SYMATTR Value PULSE(-10 10 0 1e-6 1e-6 .001 .002)
    SYMBOL cap 64 160 R90
    WINDOW 0 -44 30 VBottom 0
    WINDOW 3 -37 31 VTop 0
    SYMATTR InstName C1
    SYMATTR Value 1e-6
    SYMBOL schottky 128 304 R180
    WINDOW 0 -44 31 Left 0
    WINDOW 3 -79 -5 Left 0
    SYMATTR InstName D1
    SYMATTR Value 1N5819
    SYMATTR Description Diode
    SYMATTR Type diode
    TEXT -34 378 Left 0 !.tran .005
     
  5. Rich Grise

    Rich Grise Guest

    For OP's edification, this is called a "clamp" circuit.

    Cheers!
    Rich
     
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