Other Parts Discussed in Thread: TINA-TI, OPA838
I am using OPA657 for my transimpedance amplifier.
Can i read continuous laser signal with this circuit?
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Looks pretty good to me, couple of comments,
1. Don't need R10, that just adds noise
2. Don't need the bias current cancellation network on +IN, the OPA657 is a JFET input device so no bias current matching, just ground +IN
3. Stability is the next thing, and would need the estimated D2 capacitance for that that,
I reviewed decomp op amps and design application (including this one) in this article, If you cannot read the tables and figures let me know and I will attach a pdf,
I want to ask another question. We discussed ambient light rejection circuit in below link.
I am trying the circuit you recommend. What is the purpose of 1.5V DC bias? Can i reduce it to 0V?
Oh, well that was a single supply design and I was holding the Zt stage pins in range headroom wise with the 1.5V reference - if you are bipolar supply on both, you can make that gnd - if there is a 2nd stage to get to a differential ADC with an FDA, you can stay at ground there and single supply in the FDA.
I worked out a pretty full example of that in the OPA838 introduction time period in this article,