Hi Paul, SIU, I think I got it. they expected to see output low during power on actually, so the solution to make sure the output are all low for large volume pcs run is to manage to let the IN- larger than IN+ during VCC-2V, am I right? can I add a increase the cap value PC4413 to slow down the PWR_OVP-3(IN+) rise time ..read more

Hi Rakesh, Below is my design for your system and an annotated version for brief explanations. The two stages have a total gain of 1M. I have shown the response to a 600kHz, 1uA pk-pk signal as well. You can't really increase the gain of the transimpedance stage due to limits in how small capacitors can be made and also the common mode input limits, but you may be able to push the gain of the second stage. The biggest thing to watch out for is noise. Below is an image of the simulated total noise, with a curser at 600kHz, your original bw request. We can see that a 2nA signal gained 100k from ..read more

Hi Hua, "Schmidt Trigger" = Hysteresis. The "Schmidt" trigger logic gates add internal hysteresis. Hysteresis is the difference between the upper and lower thresholds. The logic gates looks to have 100-300mV of hysteresis. The high speed comparators have a small amount (3mV) of internal hysteresis to prevent "chatter" (up-down). It is also possible to add external hysteresis if needed. So the comparator would have more accurate trip points (±1.5mV of the set threshold). That makes for more symmetrical output if the threshold (reference) is exactly in the middle of the sinewave. The TLV3601 can ..read more

Hi Sai, My first suggestion would have been to add decoupling to the breadboard, but it seems like that was already done and did not help. Could you probe the output of the amplifier and see if you see any signal? This would include adding the Rf back to the circuit and basically probing the circuit with the same setup as the one on the EVM. You can add a 1V input signal to the noninverting pin and ideally the output should be around 5V. This would be a good test to see if the device is configured appropriately. Having a feedback resistor should not be causing this either as it is ideal. Have ..read more

closing ticket, reopen and reply if you need further assistance ..read more

Hello, I checked withTLV3601 and its family. I agree I need a high-speed comparator (as a buffer) like this. But, TLV3XXX family does not have Schmidt trigger feature, so I can see output could switch up and down very fast during the transition. Then, I found a pspice model for SN74LV1T00 which has a good function for what what I'm looking for. However, input sinusoid frequency is only up to 120MHz(hope to acheive 200MHz), and VCC can only go up to 3.8V(hope to achieve 5V VCC). Can I find a comparator with schmidt trigger, also get higher input frequency range and wider VCC range? I found SN74 ..read more

Hi Vijay, I'm not sure that you need 15V/μs slew rate... The 330pF capacitor (C47) creates a low pass filter with the 2.49MΩ series input resistance resulting in a input signal bandwidth of less than 200Hz. Typically, the slew rate required can be calculated by the equation below. For 200Hz signal, your slew rate requirements should be fairly low. https://www.electronics-notes.com/articles/analogue_circuits/operational-amplifier-op-amp/slew-rate.php If you do prefer an amplifier with a slew rate greater than 15V/μs, I recommend either OPA2140 or OPA2192 . These are both 36V dual channel amplif ..read more

HI Emily, Ideally you would select the TVS diodes with a stand-off voltage set to the nominal supply voltage, and clamping voltage at or below the Absolute Maximum ratings of the XTR300 device. In the circuit above, since the negative supply is -5V, choose a unipolar TVS diode with a stand-off voltage of 5V, and a breakdown voltage and clamping voltage that is relatively close. As an example, on one typical TVS diode found on the web with a minimum reverse standoff voltage of 5V, will offer a breakdown voltage around 6.2V and a clamping voltage of 9.2V. Similarly, for the positive supply of +1 ..read more

No problem. Glad I could assist you ..read more

Hi Suma, Unfortunately, we do not provide any data outside of what is listed on the datasheets, and I can't provide any timelines on the public forums ..read more