Adaptive power supply arrangement
AssigneeAgere Systems Inc.
InventorRobert H. Leonowich
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Abstract
An arrangement for adjusting a fixed power supply voltage level to a different level that may be required by a connected circuit module comprises a differential amplifier and resistor divider network. A reference voltage is applied to the positive input of the differential amplifier and an internal node voltage within the resistor divider network is fed back as the negative input. The values of the resistors in the network are specifically chosen to provide for the desired voltage level. Each such arrangement of the present invention may then be individually tailored for the particular circumstance.
Claims11
An arrangement for adjusting a first, defined reference voltage (Vref) to form a second predetermined voltage (Vprog) as an output of the arrangement, the arrangement comprising
- a power supply providing a fixed, known voltage (Vfixed), wherein the first, defined reference voltage (Vref) is generated from said fixed, known voltage;
- a differential amplifier including a first, positive input and a second, negative input and an output, the differential amplifier powered by said fixed, known voltage and the first, defined reference voltage is applied as an input to the first, positive input;
- and
- a resistor divider network, including an internal divided voltage node, coupled between the differential amplifier output and ground potential, wherein said internal node in the divider network is tapped and applied as the second, negative input to said differential amplifier, said differential amplifier output defining the second predetermined voltage output of said arrangement.
A method of adjusting an input voltage to an output voltage comprising
- providing a reference voltage and a portion of the output voltage to a differential amplifier to produce the output voltage.
Dependencies are inferred from the claim text.