Re: How to design voltage detector without bandgap reference
First of all, many thanks to all!
Maybe I should make it more clear as follows:
What I need to design is a voltage detector circuit for power supply Vdd ranging from 1.6V~6V and temperature ranging from -40C to 125C.
The circuit has one input: power supply Vdd,
and three logic outputs: Low, Mid, High which indicate whether Vdd is in
1.6V~2.5V,2.5V~3.8V,3.8V~6V or not.
joskin,
I will take a look at Razavi's book later.
Humungus,
Unfortunately the application is for automotive product, so the temperature range is very vast.
unkarc,
I am afraid LED is not available in generic CMOS process. Your idea is a good catch for me, however.
adanshen,
Actually the requirement is quite tight, accuracy should be within 200mv.
regards,
jordan76