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About power amp (BTL) and THD

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wjlzhx

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hi everyone
I have a problem in my design.
when i use BTL output ,the THD is large ,i simulate with spectre


now i have found the problem ,in sometime the NMOS and PMOS power thansistor both off.

i think that the OTA's gain is too small ,so i let the bais current increase ,in this time the THD is improved
but if i do this ,the power thansistor's static current became large .so what can i do???

if you have some advice please tell me
thank in advance
 

the nmos power transistor bias by a nmos from ota1 ,and the pmos power transistor bias by a pmos from ota2.
the thd and the static current are opposition.
 

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