Interview Questions
Analog Devices
Precision analog & mixed-signal; deep AMS and validation loops.
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Interview process
- 1Recruiter screen
Background and domain interest
- 2Technical phone screen
Analog fundamentals
- 3Onsite: circuits deep-dive
Op-amps, bandgaps, PLLs, data converters
- 4Onsite: system reasoning
Spec-to-topology trade-offs and debug
- 5Hiring manager & behavioral
STAR stories, project deep-dive, team fit and salary discussion
Free sample questions
3 freeWhat is phase margin and why does a rule-of-thumb target ~60° matter?
Phase margin is 180° minus the loop's phase at the unity-gain frequency; it quantifies stability. Around 60° gives a good compromise: minimal peaking/overshoot and a fast, well-damped step response. Too little margin causes ringing or oscillation; too much makes the loop sluggish.
Compensation (e.g., Miller) is used to set phase margin — a common follow-up.
A differential pair's ability to reject signals common to both inputs is quantified by:
- PSRR
- CMRR
- THD
- SNR
CMRR (common-mode rejection ratio) measures how well the amplifier rejects common-mode signals relative to differential gain — key for noise immunity.
What is the gain-bandwidth product (GBW) of an op-amp?
For a dominant-pole amplifier, GBW is roughly constant: the open-loop DC gain times the dominant-pole frequency equals the unity-gain frequency. Raising closed-loop gain lowers available bandwidth proportionally.
GBW lets you estimate the bandwidth you'll get at a chosen closed-loop gain — a core analog design trade.
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