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This alternative architecture uses a single inductor to generate two different supply voltages. The generation of two independent voltages is accomplished by synchronously regulating both the common mode and differential of the two supply voltages based solely on the output from two clocked comparators. Further, the control logic is implemented with only digital standard cells, and overcomes the quantization errors seen in another architecture through the use of a multibit /spl Sigma//spl Delta/ in generation of the PWM waveform.
Date of Conference: 7-7 Feb. 2001