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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Choosing the right transformer
Date: Sun, 19 Jan 2003 18:50:09 GMT
NNTP-Posting-Date: Sun, 19 Jan 2003 10:50:09 PST
> Here's the block diagram of the system
> CD player -->digital out-->(DSP or FPGA)-->one-bit
One bit output is a bit misleading because it is PWM output. Let's put
the feedback in.
CD player -->digital out-->DSP-->one-bit-output-->(1)
| A/D |
In the above, the DSP compares the data word from the CD with the
digital word from the A/D converter. If they are different, the pulse
width is corrected accordingly.
This is expensive for audio because of the high resolution of the A/D
but it can be done. In servo systems having very similar block diagrams,
closing the loop on class D amplifiers is always done when quality
considerations do not forbid class D (most engineers will not consider
using class D amplifiers in the same system with low level signal
... 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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