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

R

#### royalmp2001

Jan 1, 1970
0
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

J

#### Jamie

Jan 1, 1970
0
royalmp2001 said:
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
use a diode for the + side and apply a little fix voltage
for the +0.25

C

#### Chris

Jan 1, 1970
0
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

Hi, Royal. You want simple? Here's simple (view in fixed font or M$Notepad): | | || + | .-------||----o-------o | | || | | | 1uF | | / \ | | ( ~ ) 1N5819 V Vo | \_/ - | | | | | | | | | | '-------------o-------o | - (created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de) Use a non-polarized cap for C. The 1N5819 is a 40V schottky rectifier with a forward voltage drop of about 0.25V or so. This will shift the DC level so the output coltage is always positive. Not perfect, but close enough? It's sure simple. Cheers Chris J #### John Fields Jan 1, 1970 0 Hi, Royal. You want simple? Here's simple (view in fixed font or M$

|
| || +
| .-------||----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.

---
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

R

#### Rich Grise

Jan 1, 1970
0
Hi, Royal. You want simple? Here's simple (view in fixed font or M\$

|
| || +
| .-------||----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.

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

Cheers!
Rich

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