load the tuned circuit

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load the tuned circuit

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ppppenguin

Senior Engineer in Charge

Posts: 7,634
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Location: London N12

#19

17-07-2017, 07:46 AM

High Hfe (or beta if you prefer) often makes very little difference at RF. A BC559C witha typical hfe of over 500 has an Ft of 300MHz. The actual current gain falls to unity at Ft. Fortunately gm (mutual conductance) doesn't fall in the same way. Or have I got that wrong?

www.borinsky.co.uk Jeffrey Borinsky www.becg.tv

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Messages In This Thread

load the tuned circuit - by unrealdave - 13-07-2017, 12:48 PM

RE: load the tuned circuit - by ppppenguin - 13-07-2017, 12:58 PM

RE: load the tuned circuit - by unrealdave - 13-07-2017, 01:00 PM

RE: load the tuned circuit - by unrealdave - 13-07-2017, 01:38 PM

RE: load the tuned circuit - by pwdrive - 13-07-2017, 01:47 PM

RE: load the tuned circuit - by unrealdave - 13-07-2017, 01:54 PM

RE: load the tuned circuit - by reset - 13-07-2017, 02:23 PM

RE: load the tuned circuit - by reset - 17-07-2017, 03:55 AM

RE: load the tuned circuit - by pwdrive - 13-07-2017, 02:15 PM

RE: load the tuned circuit - by ppppenguin - 13-07-2017, 02:19 PM

RE: load the tuned circuit - by unrealdave - 13-07-2017, 02:44 PM

RE: load the tuned circuit - by ppppenguin - 13-07-2017, 04:22 PM

RE: load the tuned circuit - by reset - 08-09-2017, 04:50 PM

RE: load the tuned circuit - by Crackle - 13-07-2017, 09:50 PM

RE: load the tuned circuit - by Alistair D - 13-07-2017, 10:05 PM

RE: load the tuned circuit - by Crackle - 14-07-2017, 05:46 AM

RE: load the tuned circuit - by Terry - 14-07-2017, 11:37 AM

RE: load the tuned circuit - by Crackle - 14-07-2017, 12:03 PM

RE: load the tuned circuit - by Pat Pending - 17-07-2017, 06:26 AM

RE: load the tuned circuit - by ppppenguin - 17-07-2017, 07:46 AM

RE: load the tuned circuit - by Pat Pending - 24-07-2017, 08:11 PM

RE: load the tuned circuit - by Pat Pending - 17-07-2017, 08:25 AM

RE: load the tuned circuit - by ppppenguin - 09-09-2017, 06:56 AM

RE: load the tuned circuit - by reset - 12-09-2017, 02:24 AM

RE: load the tuned circuit - by ppppenguin - 12-09-2017, 06:32 AM

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