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Design >> Analog Design >> BJT circuit: Resistor to Voltage Converter
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Message started by luoshuer on Feb 19^th, 2018, 6:04pm

Title: BJT circuit: Resistor to Voltage Converter
Post by luoshuer on Feb 19^th, 2018, 6:04pm

Hi Guys

I am not an expert in bipolar circuit design. Currently, I am working on the bipolar circuit, resistor to voltage converter, and looking for the help.

External resistance ranges from 100 to 10K, output voltage is around +/- 100mV @ 40C from 100 to 10K. The output could be slightly off from the picture, and I am looking for a conceptual solution

Many thanks indeed
Suer

Title: Re: BJT circuit: Resistor to Voltage Converter
Post by A Kumar R on Feb 20^th, 2018, 3:32am

you have a negative supply in the system?

Title: Re: BJT circuit: Resistor to Voltage Converter
Post by luoshuer on Feb 20^th, 2018, 9:28am

Hi Kumar,

I have VDD= 2V, GND=-1.3V

Sorry, I didn't mention it earlier.

Thanks
Raymond

Title: Re: BJT circuit: Resistor to Voltage Converter
Post by Jacki on Mar 20^th, 2018, 1:39am

which kind of help do you need? a resistor to voltage converter seems like a resistive sensor, with the voltage divider and voltage buffer, you track the output voltage. I think if you want a good track, first your supply votlage should be quite stable, or else, you need a Vref. The bipolar transistor may help you to generate the Vref, maybe the buffer as well. The output voltage accuracy depends on the sensitivity requirement of your sensor.