Table 1.
Effect of the circuit parameters on SNR and distance stability. Re = RCM//RDM//RPH, Ce = CCM + CDM + CPH (see Figure 3).
|
Improve
SNR |
General | Supposing Cf << Ci = CCM + CPH (typical in high BW systems) | |||
| Rf↑ y Cf↓ | Rf↑. Effect of Cf is negligible (minimum value is determined by TIA stability to avoid oscillations) | ||||
|
Improve
Sd |
Instability | ||||
| TC(Rf), TC(Cf) | TC(CFP) | ΔGBWP/GBWP | ΔRe/Re | ΔCe/Ce | |
| (f/fc)↑ fc↑( Rf↓, Cf↓) |
(f/fc)↑ Rf↓ |
(Rf/Re)↓, Rf↓, Re↑ (Ce/Cf)↓, Cf↑, Ce↓ GBWP↑ (f/fc) Effect depends on value of: Rf/Re and Ce/Cf |
(Rf/Re)↓, Rf↓, Re↑ GBWP↑ (f/fc)↑ |
(Ce/Cf)↓, Cf↑, Ce↓ GBWP↑ (f/fc)↓ |
|