The Vdd bypass capacitor has the largest effect on the LNA output match, and is required for proper operation. Because the input match affects the output match to some degree as well, the process of picking the bypass cap value involves some iteration. First, an input match is selected which gives adequate gain and noise figure. Then the bypass capacitor is varied to give the best output match. The demo board achieves 11-12dB of return loss which is adequate for connection directly to the input of a SAW filter.
PC74HCT240T PC74HCT240T PC74HCT240T on stock| | | | | | | | | VDD='- 50V Vn.- _inv |
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| | | | 1 | | | Tc= 250C nl-- T_, |
| | | | I | | | | uibe i esL - I I iD = 10A |
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| | | | L | | | | | | 3A |
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