The mosfet operation (depletion mode) was discussed in mine other thread. It is just CCS and it gives combination of CCS and bootstrap VAS, and I never saw anything similar used before.
If you like to build this amp here is last layout in pdf. In my prototype I used older layout, so it needs check and you can change mosfet from TO220 to TO92 type.
Damir
I've found some layout error in that PCB, Ian will have gerbers for new layout if someone interested.
Damir
Congratulations, you're design is very good amplifier. This amp can do a bit better. Look at R5L1. This circuit will add depth NFB.
Thank you for your comment and suggestion. I simulated it with added RL between LP emitters and I've got some marginal THD20k improvement, but with some Phase Margin loss. I tried to optimize RL but still not to big difference. To get better result, I suppose I have to optimize whole LP and it's not worth the effort as distortion is already very low.
Bootstrapped CCS is/was afaik often used in low-voltage portable and automotive chip-amps (TBA, TCA, TDA series etc)....
The mosfet operation (depletion mode) was discussed in mine other thread. It is just CCS and it gives combination of CCS and bootstrap VAS, and I never saw anything similar used before.
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Do you have any comments about?
I see you don't use LTspice and I don't recognize the type. Are all those plots simulations only?
Hi dadod what is funcition of d3 ?
It's a part of the LTP CCS.
tPD = Gain*tPD(Gain=+1)
Propagation Delay, nS and Unity Gain Frequensy (UGF), MHz for some operational amplifiers:
LM6172 – 1,0 (100); THS4041 - 1,7 (89); LT1363 (64) - 2,0 (70); EL2044 – 2,5 (38); AD817 - 3,0 (50); AD843 – 4,6 (34); LM837 - 7,0 (25); AD744 - 8,0 (13); OPA627 - 10,0 (16); OPA2132 - 13,9 (8,7); NE5532 – 16,2 (9); TL072 – 53,6 (2,7)
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Sory what funcition of d8? is true )Schematic and PCB.
Sory what funcition of d8? is true )
Read the post #61.
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