analog filter vs digital filter | Difference between analog filter and digital filter
This page compares analog filter vs digital filter and describes difference between analog filter and digital filter.
Both the filters are used for one common purpose, to filter out unwanted
frequencies of the spectrum and pass the desired frequencies.
Depending upon the filtering action, there are different types of filters.
In general they are referred as low-pass, high-pass,
band-pass or band-stop filters.
LPF vs HPF vs BPF vs BSF>>
Analog filter
Analog filter is used to filter out signals before conversion to the digital form,
meaning they are used before ADC in the circuit mainly in the analog part of the system.
Analog filters are designed using discrete components such as R (resistor), L (inductor) and C (capacitor).
RF/Microwave based analog filters are designed based
on microstrip,strip line circuits or waveguides etc.
Examples: RF Filter based on Microstrip line, READ MORE>>
Digital filter
Digital filter is used to filter out signals after conversion of the analog signal to the digital form
, meaning they are used after ADC in the circuit mainly in the digital processing part of the system.
They are referred mainly as FIR or IIR filter, mainly designed in the form of software ported either on
FPGA/DSP.
Examples: FIR and IIR filters developed using C or assembly code or using any other languages.
These are ported on FPGA/DSP processor.
Refer FIR vs IIR Filters>> and
FIR MATLAB Code>>.
Following table mentions comparison between analog filter and digital filter based on their respective advantages and disadvantages.
| Specifications | Analog Filter | Digital Filter |
|---|---|---|
| Programmable coefficients | No | Yes |
| Complexity | Higher, usually seen in high performance based analog filters. | Lower |
| Latency | Lower | Higher |
| Cost | Higher, it depends on analog components used in the design. | Lower |
| Drift Error, multichannel matching error and aging | YES | NO |
| Protection feature for ADC input | Available | Not available |
| Additive noise introduction | It adds component based thermal noise in the bands | It adds digital noise due to quantization process |
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