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# Amplifier Circuit Design

## Amplifier Circuit Design

(OP)
Hi All,

I have designed a simple non-inverting amplifier using LM358 with gain of 1.76 (Rf = 0.76K & R1 = 1K). I have given a supply voltage of +5V to the opamp. My input  voltage varies from 0 to 5V. My problem is that the output from the opamp gets saturated at 3.6V(which is limited by the opamp supply voltage). I wanted to increase this saturation voltage(opamp output) somewhere near 4.2 to 4.3V.

I know that by increasing the supply voltage to OpAmp to 6 or 8V, and having a diode connected to 5V supply, i will be able to trim my output to 5V. But i need to achive a rail to rail voltage of 4.3V (I don't mind the saturation of output at 4.2V or 4.3V) with just 5V supply to opamp.

Note: I tried the same circuit with LM741, which requires dual supply of +5V/-5V,the output saturates at 4.2V.(All the other circuit components remains the same, like resistor, gain = 1.76 etc)

Pl tell me anyways to achive this, or suggest any other IC that will work on 5V single supply and give me an output saturation close to 4.3V.

Santo

### RE: Amplifier Circuit Design

LM358 data sheet says it output goes from 0 volt to (Vc - 1.5) Volts. So what you have is expected. you can use 6 volt single 6 volt. no clip diodes..
You may use TLV2211 by TI it works from 3 to 10 volts and o/p includes both supplies.
use IC Master
http://www.icmaster.com
or
All Data Sheet
http://www.alldatasheet.com

Maged A. Mohamed
http://magedm.freeyellow.com
http://www.magedsoft.com

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