8.10. Comparison of Numerical Gain Results
Gain calculations were made using kn = 1000 μA/V2, λn = 0.05 V–1, RD = 150 kΩ, Rbias = 100kΩ, ηn = 0.15, ID = 50 μA, and VDS = 5 V. The values are given in Table 8.1. For the comparison, gm was calculated with the precision form [(4.5)] (λn ≠ 0) for all cases. Possibly a more valid consistency (hand calculation versus precision calculation) would be achieved with the use of the approximate form for gm up to λn ≠ 0. This would reduce some of the difference in the results. For example, for the first case, av1 = –av2 = –33.5, with the approximate form for gm (λn ≠ 0).
| TABLE 8.1 | ||
|---|---|---|
| Gain Magnitudes | av1 | av2 |
| Rbias = ∞, λn = 0, ηn = 0 | 37.5 | 37.5 |
| plus Rbias = 100KΩ | 37.9 | 37.1 |
| plus λn = 0.05V–1 | 29.21 | 28.48 |
| plus ηn = 0.15 | 29.17 ... | |
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