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no i dont mean i adc circuit. i just simply want to make ciruit tht gives me a negative voltage 0f fixed value -88.25 mV ,so that further i can feed this to my circuitry.
What about the standard reference voltage and operational amplifier with a fractional gain, inverting configuration?
The circuit can have high input resistance (or very high if the additional op ampl. separate the reference voltage and inverter input) and low output resistance. For sure it should have a better performance than simple R/R divider.
Of course you should select devices with the low thermal drift.
You have to use "standard" reference voltage.
I do not remember the type but there is a range of devices that can give stable voltages about 1V (there are also a good reference zener diodes at 7V range).
To get 88,25 mV you should either :
1. supply a reference voltage device from -U and use a R/R divider , (not all reference voltage can be supplied from negative , but many of them are two terminal devices (like zener diode) abd can give positive or negative reference).
2. apply 1V at the the operational amplifier input with the gain about minus 1/11 (calculate the proper factor yourself) and at the amplifier output you will get what you are looking for.
I do not have a scanner , so I can not enclose a achematic diagram. sorry.
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