Table 2.
Design parameters and final model values for 1st and 2nd generation ASIC unit cell receiving circuits with reference to Figure 4.
| Parameter | Model parameter | Model value |
|---|---|---|
| Feedback capacitor | C1 | 2.5 pF |
| Feedback resistor | R1 | 100 kΩ |
| TX, RX1 RON | R4 | 411 Ω |
| RX2 + SEL RON | R2 | 520 Ω |
| Cable capacitance | C2 | 100 pF |
| Verasonics Rin | R3 | 8 kΩ |
| Transducer model | C3 | 6 pF |
| 2nd gen cell receive capacitance | Cx | 116 pF |
| 2nd gen buffer source resistance | R5 | 65 Ω |
| 2nd gen buffer input resistance | R6 | 4 kΩ |
| 2nd gen switch ON resistance | R7 | 330 Ω |