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In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output

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In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output

A. Zero
B. Switches between – 1 / 2 and + 1 / 2
C. Switches between – 1 and + 1
D. Switches between 0 and + 1