Bootstrap capacitor power supply for low voltage mobile communications power amplifier
AssigneeSharp Laboratories of America, Inc.
InventorGeorge Stuart Vernon
Life of this patent
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Abstract
A power supply circuit for use with a RF power amplifier in a communications device includes a battery; a low impedance capacitor connected in series with the battery; a discharge blocking mechanism to prevent discharge of the capacitor until the occurrence of a triggering event; and a summing mechanism to combine the voltage from the battery with the voltage from the capacitor to power the RF power amplifier.
Claims10
A power supply circuit for use with a RF power amplifier, requiring an operating voltage of about 5.0V, in a communications device, comprising:
- a battery for supplying less than about 4.5V;
- a low impedance capacitor connected in series with said battery for boosting voltage to greater than 4.8V;
- a discharge path blocking mechanism to prevent discharge of said capacitor until the occurrence of a triggering event;
- a charge adjusting mechanism to adjust a charge on said capacitor as a function of the voltage on said battery;
- and
- a summing mechanism to combine the voltage from said battery with the voltage from said capacitor to power the RF power amplifier at a voltage of about 5.0V.
A power supply circuit for use with a RF power amplifier in a communication device, comprising:
- a battery having a variable output voltage;
- a capacitor;
- a switching mechanism located between said battery and said capacitor, including a first transistor and a second transistor for alternately charging said capacitor to a predetermined level and for connecting said battery and said capacitor in series with the RF power amplifier upon the occurrence of a triggering event;
- a first diode for blocking discharge of said capacitor;
- and
- a reference mechanism for controlling the amount of charge placed on said capacitor.
Dependencies are inferred from the claim text.