Eric Woudenberg wrote:
>If someone who knows this subject *cold* would like to write a crisp,
>concise, FAQ level answer about 16 bit vs. 1 bit conversion, I would
>be happy to include it in the MDCP FAQ. I will clean up the English if
>requested.
Conventional 16 bit convertors produce a 16 bit wide binary value that is
represented as either logic high or logic low levels on 16 separate wires
for each sample value. These wires are connected to a resistor network to
produce voltages proportional to the binary values represented by the logic
highs and lows on the 16 wires.
1 bit convertors use a technique called pulse width modulation (PWM). This
involves producing a voltage pulse of a duration proportional to the value
of the sample, for each sample. The longer the pulse, the higher the
voltage effectively produced (after filtering).
The resistor network method suffers from inaccuracy due to the variations
from ideal in the voltages produced by each binary digit, caused by small
variances in the resistor values making up the divider network. PWM OTOH
gives very good accuracy because it relies only on a single voltage and an
accurate time base - both very easy to achieve.
-cb
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