| ??? 05/25/07 17:59 Read: times |
#139843 - a little more.. Responding to: ???'s previous message |
Hi Kai,
Thanks for the response. Yes, the LC is 5.8Ghz on this one - sorry, I forgot to mention that I'm using a nordic radio and their reference schematic (which is almost identical save slight component value choices), but their LC choices lead you to 7.1GHz resonant frequency. If you add C2 and C12 to C4 you get 4pF which leads me to f = 2.054GHz. I'm not sure that I see why you need to add C2 and C12 to C4. Fresonant of the LC is just going to be a function of L1 and C4. Looking at the node that is the output of the PA am I mistaken that 2.4GHz will find a path to ground via the LC and C7? Yes, 2.4 is/has been a pain...ugh. My layout is solid - tons of ground everywhere (vias to a plane) and extremely short traces. You're right, the equipment is extremely expensive. I think some of the stuff around the office borders 50k USD. After I measure S21 of just the PA I'll report back. Thanks for your help, David |
| Topic | Author | Date |
| RF forum/question? | 01/01/70 00:00 | |
| Physician's Assistant? | 01/01/70 00:00 | |
| Daddy? | 01/01/70 00:00 | |
| Power Amp | 01/01/70 00:00 | |
| this is not a RF forum | 01/01/70 00:00 | |
| Power Amplifier | 01/01/70 00:00 | |
| my intent was not ... | 01/01/70 00:00 | |
| Power Attenuator | 01/01/70 00:00 | |
| What is your problem? | 01/01/70 00:00 | |
| not getting any output | 01/01/70 00:00 | |
| Don't forget C2, C12 and the stray capacitances | 01/01/70 00:00 | |
| a little more.. | 01/01/70 00:00 | |
| Don't take the values too seriously,... | 01/01/70 00:00 | |
| fair enough | 01/01/70 00:00 | |
Electrodynamics instead of electrostatics... | 01/01/70 00:00 |