Timeline for Output matching influences the input matching (RF amplifier)
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Oct 20, 2023 at 8:01 | history | edited | JRE | CC BY-SA 4.0 |
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| Oct 20, 2023 at 7:59 | vote | accept | mjg | ||
| Oct 20, 2023 at 7:59 | |||||
| Oct 20, 2023 at 7:59 | answer | added | mjg | timeline score: 1 | |
| Oct 15, 2023 at 9:56 | comment | added | Tim Williams | There's the behavior that base input impedance is, in part, the rotation of emitter load impedance, so inductance rotates to resistance (or for stability purposes, capacitance rotates to negative resistance(!)), in the HF/cutoff region. Unfortunately I don't have the formulas or any references handy on this matter. | |
| Oct 15, 2023 at 9:31 | comment | added | mjg | Hi Marcus! Thanks for the warm welcome. I added a schematic to clarify my design approach. According to Razavi: " Interestingly, the input impedance contains a frequency-independent real part given by gm*L1/CGS1. Thus, the third term can be chosen equal to 50 Ohm (page. 309). This I dont understand at all. | |
| Oct 15, 2023 at 9:24 | history | edited | mjg | CC BY-SA 4.0 |
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| Oct 14, 2023 at 13:38 | comment | added | Marcus Müller | Welcome! I think single-transistor RF LNA in common emitter configuration is reasonably clear, but I'm not quite sure where your inductor sits exactly. Would you mind adding a schematic to your question? | |
| S Oct 14, 2023 at 13:25 | review | First questions | |||
| Oct 14, 2023 at 14:51 | |||||
| S Oct 14, 2023 at 13:25 | history | asked | mjg | CC BY-SA 4.0 |