Analog phase shifters provide a continuously variable phase, most often controlled by a voltage. .... Digital phase shifters provide a discrete set of phase states that are controlled by two-state "phase bits."
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Analog phase shifter advantages
- Continuous phase shift (I consider it advantage)
- Lower loss
- Lower cost of parts (but sensitive to assembly variations)
Digital phase shifter advantages
- Immunity to noise on control lines (like any digital signals)
- More uniform performance, unit-to-unit
- Ability to achieve flat phase over wide bandwidth
- Less susceptible to phase pulling when embedded in networks that are not perfectly impedance-matched
- Easier to assemble
- Potentially higher power handling and linearity
