Theatre
Understanding Frequency Response on Mixed-Signal Systems
Miguel Angel Castillo Martinez
26:22
In Mixed signal applications we must consider the operating bandwidth. The most visual representation of this behavior is obtained by a bode diagram, stimulating the system with a known fundamental signal to compare and measure the magnitude and phase in the output. For academic purposes, the most widely used platform is the Arduino, with boards based on the AVR microcontroller.
This talk will investigate the software and hardware tools required to implement a basic mixed-signal system, bringing a better understanding of frequency system response using a microcontroller and Analog filters. You will be able to implement an experiment to facilitate your own learning system.
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What is the main reason the speaker recommends using both a high-pass (DC blocker) and a low-pass (anti-alias) filter before the ADC in the mixed-signal chain?
A
To remove DC that can saturate the input and to attenuate frequencies above Nyquist to avoid aliasing.
B
To increase the ADC sampling rate and thereby reduce quantization noise.
C
To shift frequency components to higher bands so the digital system can process them more easily.
D
To implement an analog compression stage that reduces the signal's dynamic range before conversion.
E
Because using filters is always cheaper than upgrading to an ADC with a wider input range.
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