Resistors for bias current return path for PGA204

Hello Robert,

I will look into this for you.

Best,

Errol Leon
Precision Op Amp Applications

Ok, that would be the minimum value. But what would be the maximum value? I would like to use a passive low-pass filter previous to one of the inputs of the PGA204 and the lower the resistor, the greater would be the loss of voltage because of the resulting voltage divider.

Best regards

Hello Robert,

Could you please send me a schematic drawing of where the passive low-pass filter is in relation to the PGA204 input, the input bias current return path resistors, and the sensor?

Best,

Errol

Hello Errol,

i attached the schematic drawing below. The TI DRV5053VA Hall-sensor has already successfully been used with shown passive low-pass filter (without an amplification), but to improve the measuring results for weaker magnetic fields i would like to amplify the signal of the sensor. VIN- is the measured offset voltage of the sensor.

Best regards,

Robert

Hello Robert,

Thank you for sending me a schematic.  I just have a few more questions on the schematic so I can create an analysis for you in simulation.

1. What are the supply voltages used on the PGA204?
2. What part number or output impedance of the DAC?
3. Gain

Thank you,

Errol 

Hello Errol,

supply voltages are +/-9V and i would like to use 1, 10 and 100 as gain. The Output impedance of the DAC is 0.2 Ohm.

Thanks for your help.


Best regards,

Robert