What is ADC and DAC?
Analog-to-digital and digital-to-analog converters.
The first conversion
converts an analog signal to a digital amplitude value, the second performs
inverse transformation. In English-language literature, the terms are used
ADC and DAC, and the combined converter is called codec
(codec).
The working principle of the ADC is to measure the level of the input signal and the output
The result in digital form. As a result of the ADC operation, a continuous
an analog signal is converted to a pulse, with simultaneous measurement
The amplitude of each pulse. The DAC receives a digital value at the input
amplitude and outputs voltage or current pulses of the required magnitude at the output
is located behind the integrator (analog filter)
it becomes a continuous analog signal.
For proper ADC operation, the input signal must not change during
conversion time, so your input is usually placed
a sample hold circuit that captures instantaneous signal level and stores
hurt him throughout the transformation time. DAC output
A similar circuit can also be installed, suppressing the influence of
execute processes inside the DAC to the parameters of the output signal.
With time sampling, the spectrum of the received pulse signal in
its lower part 0..Fa repeats the spectrum of the original signal, and above
contains a series of reflections (aka, specular spectra), which are found
they are placed around the sample rate Fd and its harmonics (sidebands).
In this case, the first reflection of the spectrum of the frequency Fd in the case of Fd = 2Fa is
is based directly behind the original signal bandwidth and requires
your anti-alias filter with a high
the thickness of the cut. In the ADC, this filter is installed at the input to exclude
overlapping spectra and their interference, and in the DAC – at the output, which
supra-tonal noise introduced by time in the output signal
resampling.
