THS4524: THS4524

user5246204

Prodigy 80 points

Part Number: THS4524
Other Parts Discussed in Thread: TINA-TI

Dear all,

Unfortunately I am facing a issue on this circuity

On explicated case the signal VM1 is going to 1000mV offset.

Could someone has an idea ?

Thanks in advance

over 6 years ago

0 kai klaas69 over 6 years ago

Guru 140200 points

Hi,

can you share the TINA-TI file of the circuit?

Kai

0 Rohit Bhat over 6 years ago in reply to kai klaas69

TI__Genius 15975 points

Hi,

If you have a DC level at the driven input (VG1) where the un-driven input is tied to GND, then it is possible for the DC voltage to manifest itself as differential output offset due to the 45V/V gain in the circuit. You may want to see whether applying a positive or negative offset at the input helps reduce this differential output offset seen at VM1.

It would really help if you could provide a bit more information on the input signal levels in-order to help debug further.

Best Regards,
Rohit

0 user5246204 over 6 years ago in reply to kai klaas69

Prodigy 80 points

FinalCurrentFilter_DC_OFFSET.TSC

0 user5246204 over 6 years ago in reply to user5246204

Prodigy 80 points

Dear all, thanks for all your points, please see upper the attached TINA simulation files.
The input signal is a very small signals from 0Vrms to 50mVrms provided by a sensor.

As we are faced this issues we do not know if it is coming from the circuit or from the sensor

0 kai klaas69 over 6 years ago in reply to user5246204

Guru 140200 points

Hi,

the 81R source resistance of sensor is a bit disturbing the symmetrie of the circuit, but at the end the circuit is exactly doing what it is expected to do: The unsymmetric input signal is transferred to a symmetric output signal, centered arround the common mode voltage of Vocm = 2V. The feedback resistances set a gain of 91k / 2k27 = 40.1.

Kai

0 user5246204 over 6 years ago in reply to kai klaas69

Prodigy 80 points

Hello,
Ok, good point.
Thank in advance
Best Regards

Amplifiers

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THS4524: THS4524