driver for 16ohm headphone, could you give me some advice

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victorli

Joined: 15 Aug 2005
Posts: 1

24 Dec 2007 16:19 driver for 16ohm headphone, could you give me some advice

I am designing low power a driver to drive 32ohm headphone for a FM receiver. I seleted a class AB structure, but I did not hnow how to determine bandwith, gain and other requirement of opamp according design specification.
power supply is 2.4V, and process is 0.13um. In this design, low power is an important spec.
could you please give me some advices or reference paper.
thank you.

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yxo

Joined: 13 Jul 2007
Posts: 191
Helped: 14
Location: Russia, Moscow

24 Dec 2007 22:18 driver for 16ohm headphone, could you give me some advice

you may see for Analog Devices's audio amplifiers (or TI or Natioanl Semi). In datasheets there are many useful informations and necessary requirements

iamxo

Joined: 22 Mar 2006
Posts: 1031
Helped: 564
Location: Southeast Asia

25 Dec 2007 1:52 Re: driver for 16ohm headphone, could you give me some advic

I think, in output stage, since the load resistance is small, so BW is not the key point. In designing the class AB stage, you should consider the maximum output
current it can deliver and the quiscent current it consumes, and the linearity.