Why my spectrogram have negative values?

2018 3 10
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更新时间：2020 3 14
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In this figure we have a exponential sine wave and his spectrogram. My question is why the spectrogram have negative values? (from -50 to -150)

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Star Strider
Star Strider 2018-3-10

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Assuming he spectrogram function plots the power spectral density (PSD) in decibels. The values are relative, not negative, amplitudes, so -150 dB corresponds to an amplitude of about 3.2E-8.

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