Amplifier Circuit Design 1

[santorta]

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.

Thanks in advance,

Santo

 

[IRstuff]

Use an op amp specifically designed for rail-to-rail:

http://www.maxim-ic.com/products/amp_comp/rail_to_rail.cfm

TTFN

 

[maged541946]

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

search for your chip by name, or application or else, you can download the data sheet and read it for free. its pdf files

Maged A. Mohamed

http://magedm.freeyellow.com

http://www.magedsoft.com