Hi supporter,
I'm using a high speed OPAmp OPA2674 within a gain=+4 configuration which mentioned in data sheet fig. 1. Please have a reference:
In my practice circuit, i replaced the Rg and Rf to 150 and 500 Ohms, respectively. (Vsupply = +-6V, Dual supply), my input conditions are Vin = 2 Vpp from 100 Hz to 40 MHz
Here I have some detailed technical question about the OPAmp
1. The data sheet mentions that the output swing of the OPA2674 can achieve 10 Vp-p, but under my configuration, the output voltage swing clamped at +- 2.5V and cannot rise up even the Vin is increase.
2. The gain of this circuit was stay at G=+2 (Vin = 1 Vpp--> Vout = 2Vpp, Vin = 2Vpp --> Vout = 4 Vpp, freq. = 100~10M Hz), were there any wrong on my setup?
3. The G=+4 large signal frequency response (plot in page 7) mentions that the 3db frequency was higher than 100 MHz, but under my configuration, the response can't reach 40 MHz (in 30 MHz test, Vin = 1 Vpp --> Vout = 1.6 Vpp), were there any mistake or misunderstanding on my circuit setup?
Thanks for your help and I'm very look forward to someones reply!
Lin