Table 5.
Errors and noise with OPA847ID. Cf includes the value CFP = 0.2 pF; Ce = 18.7 pF.
| OPA847ID | −3 dB Cutoff Frequency (MHz). Estimated from Analysis with Figure 3 | Maximum Uncertainty (cm) due to OA. Worst Case Arithmetic Sum with ±15% Variations (Equation (13)). | Uncertainty (cm) due to TC(Rf) = ±10 ppm/°C + TC(Cf) = ±30 ppm/°C and ΔCFP = 0.6·10−3 pF, with ΔT = ±10 °C (Equations (4) and (5)) |
Noise Current (pA/√Hz), Equation (7), for f = 6 MHz and T = 300K |
|---|---|---|---|---|
| Rf >> 22K for minimum noise (≈ in of OA) | 2.57 | |||
| Rf = 22 K Cf = 1.2 pF | 6.1 | ±4.54 | ±0.16 ± 0.2 | 2.72 |
| Rf = 12 K Cf = 1.2 pF | 11.5 | ±2.74 | ±0.13 ± 0.17 | 2.84 |
| Rf = 6.8 K Cf = 1.2 pF | 21.1 | ±1.51 | ±0.09 ± 0.11 | 3.02 |
| Rf = 3.9 K Cf = 1.2 pF | 39.6 | ±0.87 | ±0.05 ± 0.07 | 3.31 |