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Advantages of Analog signal Processing over digital ?

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jennisjose

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I wanted to know why are analog filters built when digital filters can do the same with signal processing. So what inherent benefits does analog signal processing have that their are analog multipliers etc in the market?

What are the advantages of analog signal processing techniques?
 

Passive analog filters can handle large signals (voltage and power) with little distortion. You would never put a digital filter between a power amplifier in a transmitter and the antenna.

Active filters can handle a very wide range of signal levels without adding much noise.

You have to follow a DSP filter with an analog filter to remove the numerous harmonics. You will get harmonics of the sampling frequency plus and minus the signal frequency.
 

DSP requires considerably more circuitry - 40 times as much was one estimate I read. Just compare the circuitry to make a simple passive or active analogue filter with a digital one. The world is analogue.

Keith
 

jennisjose said:
What are the advantages of analog signal processing techniques?
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Each alternative has its own advantages and disadvantages.
More than that, each technical solution is a compromize between several - sometimes conflicting - requirements.
For example:
Performance, processing speed, complexity, cost, power consumption, reliability, versatility, tunability, volume, life time,.....(something else)?.

As a consequence, it is one of the most important (and difficult) task for an engineer to find an optimum solution (the best compromize) out of several different alternatives to fulfill the system requirements.
 

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