Part Number: OPA858 Dear all,
I am triying to simulate the TIA behavior of OPA858 using TI-TINA. I'm tring to I have some questions below:
1. Since the OPA858 is the kind of decompsensated OA, can I directly use the value of GBW(5.5Ghz) to estimate the…
Part Number: OPA858 Other Parts Discussed in Thread: OPA656 Hello Michael,
One more question, regarding the Spice model of OPA858.
Does it model the effect of noise current increase with frequency, as described in OPA858 data sheet on the page 18?
Thank…
Part Number: OPA858 Hi there.
I'm planning to use OPA858 as a TIA for measuring unknown devices (LCR). Max frequency range would be 10MHz., and there will be one amplifier per measurement range.
In the worst case range (100kOhm RF), I've got a good…
Part Number: OPA858 In the support response titled "OPA858: Ac coupled OPA858 non-inverting amplifier shows instable behavior", there is a recommendation to add a 20 ohm resistor to the +V power supply pin. Our design has bipolar power supplies with a…
Part Number: OPA858DSGEVM Other Parts Discussed in Thread: OPA858 Hi there,
I was hoping to get help with the OPA858 amplifier.
Initially it was included in the PCB layout to be used as a Transimpedance amplifier, but now there is a plan to use it as…
Part Number: OPA858DSGEVM Other Parts Discussed in Thread: OPA858 , Hi there,
I acknowledge that this may seem like an obvious question but I was wondering if I could get assistance with testing out the OPA858 amplifier as a Transimpedance amplifier. I…
Part Number: OPA858 Other Parts Discussed in Thread: OPA818 Hello,
I want to setup an AC-coupled noninverting amplifier based on the OPA858 operating from a single 5V supply with an overall passband gain of 76V/V (37,6dB) and a minimum bandwidth of fCT…
Part Number: OPA858 Hi,
The OPA858 Spice model states that both a common mode and a differential input capacitances are 0.05 pF.
Its data sheet shows 0.62pF and 0.2 pF, correspondently.
Why is such a difference? Is this from the package?
Thank you
Hi Sima
Yes, it is. I'm talking about this diagram.
In the explanation of this diagram, it says this about Riso
” Add an isolation resistor RISO as close as possible to the inverting input of the amplifier. Select the value of RISO to be between…
Part Number: OPA858 Other Parts Discussed in Thread: OPA847 , OPA818 , OPA659 , OPA657 I love the OPA858 with it's high bandwidth, slew rate, low noise voltage density and low input capacitance.
Does TI have an op-amp with similar specs to the ones I…