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Date: 06/14/04

SP3508 Enhanced WAN Multi–Mode Serial Transceiver

© Copyright 2004 Sipex Corporation

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Figure 48. Charge Pump - Phase 4.

2-phased inverter pump

Phase 1

Please refer to figure below: In the first phase of the clock cycle, switches S2 and S4 are opened and S1 and

S3 closed. This connects the flying capacitor, C3, from Vin to ground. C3 charge up to the input voltage

applied at Vcc.

Phase 2

In the second phase of the clock cycle, switches S2 and S4 are closed and S1 and S3 are opened. This

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Figure 49. Circuit for an Ideal Voltage Inverter.

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