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LME49830 in TINA
LME49830 in TINA
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Old 6th March 2019, 10:54 PM   #51
kokoriantz is online now kokoriantz  Lebanon
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Yes , the generator is low distortion 20Mhz sine ,triangle, square and the frequency can be sweeped by the spectrum analyzer . You can observe the frequency/phase response of the circuit while adjusting it. How I regret not to have it .
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Old 15th March 2019, 04:32 PM   #52
UltimateX86 is offline UltimateX86  France
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LME49830 in TINA
Quote:
Originally Posted by kees52 View Post
this output stage does give extra gain, it is a compound with gain. the irf driver can also be a bjt then it is a hybrid. quite liniair too. regards
Hello, What do you use as driver on this compound with ECW20N20 ? Waiting to have my oscilloscope to test the lme49830 without output, I simulated some discret amp based on yamaha circlotron : Nextcloud circlotron diyaudio I created a public space on my site, where we can upload and read file ... for diyaudio the root directory : Nextcloud diyaudio
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Last edited by UltimateX86; 15th March 2019 at 04:36 PM.
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Old 15th March 2019, 06:13 PM   #53
kees52 is offline kees52  Netherlands
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The lateral mosfet has quite low gate capacitance, so this need not such a big driver, do you want use a bjt (hybrid) or a mosfet for drive? for both it is not critical, but how better the current to drive the wider the bandwith afzuse, a 500 mA to 1 amp is enough, or the irf610 ir itf 6910 mostet as drive what I did.

regards
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Old 15th March 2019, 06:44 PM   #54
UltimateX86 is offline UltimateX86  France
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LME49830 in TINA
I prefer bjt for low capacitance but mosfet should be more stable ?
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Old 15th March 2019, 06:58 PM   #55
UltimateX86 is offline UltimateX86  France
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LME49830 in TINA
Have you seen this?

Not compound but a solution to bias

Click the image to open in full size.
Circlotron—Once Again
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Old 16th March 2019, 08:03 PM   #56
kees52 is offline kees52  Netherlands
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I have already, somewone did help me also with that, but do is now not active because of work home.

regards
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Old 16th March 2019, 08:05 PM   #57
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by UltimateX86 View Post
I prefer bjt for low capacitance but mosfet should be more stable ?
Mosfets are more prone for oscillation because of gate capacitances, who can couse fase shift, so proper idle current driver do work keeping fase to zero.
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Old 16th March 2019, 08:37 PM   #58
kees52 is offline kees52  Netherlands
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Here some changes, just sim.

put in a compound output, one with njt driver and one with mosfet, last has less distortion..
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File Type: asc yamaha_buf2-1.asc (10.3 KB, 8 views)
File Type: asc yamaha_buf2-2.asc (10.3 KB, 4 views)
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Old 16th March 2019, 10:24 PM   #59
UltimateX86 is offline UltimateX86  France
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LME49830 in TINA
thank you

could you post a version with 35v on output and with model in the schematic ?

with model i found, i have more distortion with mosfet

could you keep 20n20 for output mosfet ?

the ksa1220 must not be better driver than mje ?

.MODEL KSA1220 PNP IS=4.7863E-13 BF=289.3 BR=9.76 NR=1.006 ISE=5.2481p NE=2 ISC=2.4909E-11 NC=1.5 VAF=98.5 VAR=6.7 IKF=2.7061 IKR=0.0759 RB=2.26 RBM=0.2308 IRB=0.001 RE=0.1908 RC=1.1748 QCO=0.02 RCO=3.9811 VO=11.078 GAMMA=5.01187E-8 CJE=3.4786E-10 VJE=0.9575 MJE=0.4694 FC=0.5 CJC=1.1224E-10 VJC=0.5761 MJC=0.4365 XCJC=0.4955 XTB=1.7978 EG=1.2255 XTI=3
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Last edited by UltimateX86; 16th March 2019 at 10:33 PM.
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Old 16th March 2019, 10:35 PM   #60
UltimateX86 is offline UltimateX86  France
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LME49830 in TINA
i have 3amp on output mosfet OUCH
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