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Synchronous vs stagger tuned amplifier

Short answer

In synchronous tuned amplifiers, all stages are tuned to the same centre frequency, giving high gain but narrow bandwidth with a sharp peak. Stagger tuning sets each stage to a slightly different frequency, resulting in a wider, flatter overall response with lower gain.

Differentiate between synchronous and stagger tuned amplifier.

Both are multistage tuned amplifiers; they differ in how the tank circuits of the stages are tuned.

PointSynchronous tunedStagger tuned
TuningAll stages tuned to the same centre frequency frStages tuned to slightly different frequencies around fr
Overall bandwidthNarrower than a single stage: BWn = BW1 √(2^(1/n) − 1)Wider than synchronous for the same number of stages
GainHigh, product of stage gainsLower than synchronous tuned
Response shapeSharp peak at fr, bell-shapedFlat-topped (maximally flat for a pair)
SelectivityGood, narrow-bandLower sharpness, but flat in the pass band
AlignmentEasy: all stages tuned the sameHarder, each stage tuned separately
UseNarrow-band selective amplificationWide-band IF amplifiers, e.g. TV video IF

For a staggered pair (two stages), the two stages are tuned to about fr ± 0.35 BW, where BW is the overall bandwidth, so that the two separate responses add up to a flat-topped curve.

✓ Answer checked by Claude Opus 5.5 (high effort)

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