Power supply voltage generator

摘要

This invention concerns a power supply voltage generator (1) for providing a second supply voltage (VDD2) for an electronic circuitry (60). A voltage converter (50) receives a first supply voltage (VDD1), and converts this into said second supply voltage (VDD2), such that its output voltage (VDD2) fluctuates in a control range between a lower limit (VLOW) and an upper limit (VHIGH). A voltage parameter source circuitry (3) generates a voltage parameter signal (VLOW) which is substantially equal to the minimum supply voltage value (Vmin) of the electronic circuitry (60), and feeds this voltage parameter signal (VLOW) to a parameter input (53) of the converter (50). The voltage parameter source circuitry (3) comprises a VCO (10) incorporated in a PLL. The voltage parameter signal (VLOW) is derived from a control signal (Vcontr) for the VCO (10).