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This paper presents a transistor level design of a current mode 4 switch buck boost converter (4SBBC) for polar modulation. The reference signal of this 4SBBC is the envelope signal of EDGE (Enhancement Data-rate for GSM Evolution) standard which has more than 200 kHz bandwidth. In order for output voltage to follow this fast varying reference signal, this 4SBBC uses current mode control with 10 MHz...
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