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Which outcome occurs when stray capacitance couples a high-frequency signal to a sensitive amplifier circuit?

A)Spurious oscillations due to positive feedback
B)Reduced bandwidth from impedance mismatch
C)Increased gain from resonant amplification
D)Lower noise floor exceeding design limits

💡 Explanation

When stray capacitance couples signals, parasitic feedback paths are created because capacitive reactance allows signal current injection, potentially creating positive feedback that sustains oscillation. Therefore, spurious oscillations result, rather than bandwidth reduction, gain increase, or lower noise because these require different mechanisms and circuit parameters.

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