Can I use a 1N4148 diode like a 0.5V reference???

[crono376]

using 1n4148 as reference voltage

I need to do a 0.5V reference. I planing to use an 1N4148 in serie with a 10K resistor, and the 0.5V throgh diode buffered by a OPAMP.
I need to known the presicion of this kind of configuration.
Wich is the better way to do that?

Thanks in advance

 

[E-design]

0.5v reference

The forward drop will vary by about -2mV/°C (T+) and +2mV/°C (T-)

 

[IanP]

1n4148 voltage regulator

It is not a good idea to use 1N4148 diode as a 0.5V reference ..
Employ any compensated voltage regulator, such as 78L05 or similar, divide its voltage by 10 (using 2 resistors) and, buffer it (if required) using an opamp such as CA3140, LM358 (or similar) to ensure voltage source properties at the output ..
Regards,
IanP

 

[barrybear]

I would not be tempted to use a in 4148 or any other power/signal diode as a voltage reference . Use a dedicated reference component or go the way Ianp described.

A lot will depend on just how good you require your reference voltage to be . Go with the dedicated reference component.

Barry bear

 

[marie65]

Only if you are able to keep it at the same temperature. But it's easier and cheaper to use dedicated voltage references.

 

[derun]

Use precision zener diod with more voltage and resistor divider (tolerance 0.1%).

 

[goodboy_pl]

TL431(2.5 Volt Bandgap voltage reference)+voltage devider!

BEST!

 

[VVV]

Use an LM385-1.2 from National. It's a 1.2V reference. Divide down the voltage with precision resistors, preferrably a resistor network, so they track over temperature.

 

[starchern]

using LM4051-adj low temp. coefficient shunt reference....