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Subject: Re: Choosing the right transformer
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Sun, 19 Jan 2003 13:30:30 -0500
NNTP-Posting-Date: Sun, 19 Jan 2003 13:30:31 EST
Here's the block diagram of the system
CD player -->digital out-->(DSP or FPGA)-->one-bit
I really don't see how you could feed back the output of the Hbridge in the
DSP to correct the power supply irregularities.
"Chuck Simmons" wrote in message
> Greg wrote:
> > > Ripple voltage on the supply will only be modulated onto the output if
> > > you design the amplifier with no negative feedback. You aren't trying
> > make
> > > an "open loop" class D amp, are you?
> > What does everyone has against ''open loop'' class D amp. TI does it and
> > don't see how closing the loop could be done if the modulator is
> > in DSP.
> > Any ideas?
> As pointed out, power supply regulation becomes a problem.
> Why cannot the loop be closed in a DSP? Most DSP applications I know of
> are closed loop and some involve PWM. Can you explain what you mean?
> ... The times have been,
> That, when the brains were out,
> the man would die. ... Macbeth
> Chuck Simmons firstname.lastname@example.org
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