Perfect post.
Graf is too small for accurate analysis.
It is seen that the output phase is over 10 °, a large shape distortion, the difference between positive and negative half wave, the difference between boarding and descending edge. Lots of local feedback, charging and discharging capacitors the not same current, so lateral tilt. Some of the PNP transistors is too slow because of the wide upper and lower narrow.
I could go, what you can read ...
Btw F., what is the purpose of your asking for any simulated or measured data ("I ask all who can disclose any amplifier. Measured or simulated.") when all you say is that "judge for yourself" above ???
Not to mention your output power comparision 😕 which has nothing to do with the thread topic ?
Please let Danhard share your wisdom 🙂
to danhard
As I wrote HQQF has twice the output voltage, similar Vdif, larger margin of profit, probably through a worse choice of components will HQQF in its entirety less distortion.
As I wrote HQQF has twice the output voltage, similar Vdif, larger margin of profit, probably through a worse choice of components will HQQF in its entirety less distortion.
So we want an amp that has less than 5.7 degrees phase shift at 100KHz, and no nonlinearity at that point?
- keantoken
- keantoken
If you admit Vdif approximately 20mV, then yes. Lissaoujuss shapes, many of the design can help.
Federmann, simulated HQQF pulse response is
http://volny.cz/danhard/HQQF_pulse.gif
Agree with your results?
http://volny.cz/danhard/HQQF_pulse.gif
Agree with your results?
When the amplifier in saturation, it is evident his return, how it behaves, how to deal with limitations. Lissajouss tell all need to learn to read.
So this could be seen from the picture, but I was just stupid and do not see it ?
It is necessary to increase the input voltage. Depth of saturation may vary, also created an interesting picture of how the amplifier from saturation awake.
How about this... Phase shift is 1.3@100KHz. I threw together this one with drive and BW in mind... If the load ever drops below 1 ohm, god help those Toshibas... Same thing if it oscillates. Lord!
Unfortunately it has some issues which place it in the hall of shame, it's not currently a practical design.
- keantoken
Unfortunately it has some issues which place it in the hall of shame, it's not currently a practical design.
- keantoken
Attachments
It was a little different
http://volny.cz/danhard/amp5z_pulse.gif
Sorry, it was one of my first simulation, I did not know what I'm doing, as you say.
http://volny.cz/danhard/amp5z_pulse.gif
Sorry, it was one of my first simulation, I did not know what I'm doing, as you say.
Like this?
http://volny.cz/danhard/amp5z_lim.gif
http://volny.cz/danhard/amp5z_lim_xy.gif
And what I see?
http://volny.cz/danhard/amp5z_lim.gif
http://volny.cz/danhard/amp5z_lim_xy.gif
And what I see?
Driver HQQF-55-502D, a large input signal 10V! Large capacity in the overall feedback. Sample inappropriateness overcompensation feedback. Capacity may be neither large nor small.
Interesting and very quick engagement, large bandwidth, more than 3.5 MHz. What are they doing to end cross-currents of transistors?
Last edited:
Sticking past limitation is caused by heavy saturated VAS transistor, not by large capacity in feedback loop....
Hooray - at last !!! I've never been so happy to see a cop.PMA and Upupa Epops, I will make Hugo's suggestion an official directive- ... etc
Having just wasted several hours of my life reading through 50 pages of (mostly) insults and sarcasm in order to find the useful content in between, I've gained a little insight and a lot of headache.
Thanks for your patience and perseverance, Mr Federmann.
Last edited:
- Status
- Not open for further replies.