z9u2k
Member level 1
Hey,
I'm working on a receiver circuit an I'm in need of a stable millivolt range reference for the final output stage.
The input signal is a modulated 40kHz carrier, much like any IR system. After reception, DC removal (47pF, 1MΩ) and amplification (INA128, x50,000), the threshold needed for a logical '1' is about 100mV.
I'm using a low-power comparator as a final output stage (TLC339).
I'd prefer to avoid further amplification, both from power and space considerations (and to avoid excessive negative bias on the comparator's inputs)
I was thinking on using a precision voltage reference (say, 4.096V), and feed that to a resistive voltage divider.
Question is, will it be stable enough, and whether there's a better way of achieving this low a reference?
Thanks in advance!
I'm working on a receiver circuit an I'm in need of a stable millivolt range reference for the final output stage.
The input signal is a modulated 40kHz carrier, much like any IR system. After reception, DC removal (47pF, 1MΩ) and amplification (INA128, x50,000), the threshold needed for a logical '1' is about 100mV.
I'm using a low-power comparator as a final output stage (TLC339).
I'd prefer to avoid further amplification, both from power and space considerations (and to avoid excessive negative bias on the comparator's inputs)
I was thinking on using a precision voltage reference (say, 4.096V), and feed that to a resistive voltage divider.
Question is, will it be stable enough, and whether there's a better way of achieving this low a reference?
Thanks in advance!