OPA2369AIDGKT Problem

Hi

I am using below circuit to detect the motion of human body. I have tried to simulate the same in Pspice but not getting output. Also i wanted to give 0-5v (Differnet Values) plus on R3 or in parallelOPA2369_PSPICE_AIO.zip to R4 in attached simulation files how i can do that. Also the First stage and second stage amplifier is not working.

Can you please check my simulation adn let me know where and what change i have to do to simulate my circuit.

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Thanks

Krunal Shah

Hi Krunal,

I looked in the file you referenced but didn't find the schematic for your specific circuit. Would it be possible for you to provide an image of the circuit that you are attempting to simulate? I did find a syntax listing for it, but recreating the schematic from a netlist would be too time consuming.

I don't use Cadence PSpice, but do have a similar simulator that is syntax compliant with it. I just tested the OPA369 simulation model with that simulator using a standard test circuit and it ran smoothly so it may be something about your configuration that is a problem for the simulator.

Regards, Thomas

PA - Linear Applications Engineering

Dear Thomas

Please find the schematic as attached , which i am trying to simulate. Can you please simulate the circuit in any PSpice or Multisim or any other simulation  so i can cheek at my end.

I am very new to these simulation and wanted to check the output of my circuit.

Thanks for your help in advance.

Regards

Krunal Shah

Hello Krunal,

I set up your motion control circuit in Penzar TopSPICE and it simulated without any issues. You can see the circuit I entered and the output results at each stage below. I didn't know what the input signal from the motion sensor consisted of so I used a 100uV, 10 Hz sine wave, having a +1 Vdc offset to bias X1 input into the linear region.

You should be able to set this up with your simulator and obtain satisfactory results.

Regards, Thomas

PA - Linear Applications Engineering

Dear Thomas

Thank you very much for your response, Can you please share the design file of your Penzar TopSPICE so i can simulate the same here.

Thanks

Krunal Shah

Dear Thomas

One more question , why you have added R3 ?

Thanks
Krunal Shah

Hello Krunal,

There is the possibility that the format of the TopSPICE netlist might not be exactly compatible with your PSpice simulator's netlist requirements. Usually, when a person creates the schematic in their simulator the netlist is automatically created. Do you know which TopSPICE file you would want me to send? There are a number of different files generated once a simulation has been ran. 

The inclusion of R3 was unintentional. I pulled the OPA369 model from another TopSPICE schematic and I forgot to remove the resistor from the new circuit. I did remove R3 and the simulation results were exactly the same as what I sent you previously.

Regards, Thomas

PA - Linear Applications Engineering

Dear Thomas

Thank you so much for the response. Can you please share whole project which you have created so i can try to import the same in my PSpice, actually there are so many different used in pspice that i can not understand which will work and which will not.

Thanks
Krunal Shah

IRS-B210ST01-E.pdftiduau1a.pdfDear Thomas

I have few question

a) Can you please explain each stage of the attached circuit named as TI.pdf

b) Can you please explain each stage of my schematic.

The sensor used in both circuit is the same, i do not know what kind of output of the sensor is? Is it AC/DC or Frequency base? Please not in my circuit VBAT is referring as +5V.

Also what is the use of High pass and low pass filters in the circuit.

I am asking these question because i am facing one problem with the circuit that when i place it in the front of the AC i am getting false triggering every time.

I am attaching sensor datasheet & its documents and the schematic of the TI board and its document.

Can you please help me to understand the circuit and find the correct way to eliminate the AC flow's wrong detection.

Thanks

Krunal Shah

Hi Krunal,

Please provide your email address to me and I will send a zip file containing the TopSPICE simulation files for your OPA2369 motion detection circuit. If you don't want to list your email address on the E2E, send it to my direct email.

kuehl_tom@ti.com

Regards, Thomas

PA - Linear Applications Engineering

Hi Krunal,

I wasn't involved with the TIDUAU1A TI Precision design so I don't have any particular insight into the design and its capabilities. Looking over the TIDUAU1A document it appears very compete and I do think the authors did a good job documenting and explaining the design. I am not really sure what I could add to the explanations.

Regarding your circuit: The pyroelectric infrared sensor IRS-B210ST01 is used to sense light and more specifically particular the light associated with a heat source. It appears to be some form of FET device and VOUT in the schematic consists of a dc level that is modulated by the light level detected by the sensor. Here is what I find when reviewing the circuit design:

• R65 serves as the source resistor for the FET in the pyroelectric infrared sensor
• R66 and C45 form a passive, low-pass filter with a cutoff frequency around 7 Hz
• U14-A (OPA2369) is a high amplifier having a closed-loop gain of 100 V/V (40 dB). However, because of the inclusion of C31 in series with input resistor R61, the stage has a dc gain of 1 V/V. C31 and R61 determine the low frequency cutoff and C42, R62 set the high-frequency cutoff.
• U14B (OPA2369) is another ac coupled, high-gain stage with a gain of 100 V/V. R67 and R68 are voltage divider that biases the non-inverting input at 1/2 VBAT_SYS. The cutoff frequencies are set in the same manner as the U14-A stage,
• U17 (TLV3401) is a comparatir that compares the output level from U14-B against the voltage level applied to the inverting input which is established by the R70, R69 voltage divider. The voltage at the inverting input will be 0.57(VBAT_SYS). the output from the comparator level will be near DGND, or VBAT_SYS, depending on the comparator's decision at any given time

I do not know what you mean by the ac's flow in the wrong direction.

Regards, Thomas

PA - Linear Applications Engineering

Dear Thomas

Thank you so much for the reply. By ac's flow i mean that when i place the sensor in front of the AIR Conditioner it detects its air flow and give me signal as it has detected the human motion means a false triggering.

Can you let me know how i can ignore that.

Thanks

Krunal Shah