Apparatus and methods for programmable low dropout regulators for radio frequency electronics
First Claim
1. A programmable low dropout regulator comprising:
- an error amplifier including an output and a first input;
a regulation field-effect transistor including a gate electrically connected to the output of the error amplifier and a drain electrically connected to an output node configured to provide a programmable output voltage that is programmable to a plurality of different voltage levels;
a feedback circuit electrically connected between the output node and a first voltage, the feedback circuit configured to provide a feedback signal to the first input of the error amplifier;
an output capacitor electrically connected to the output node; and
an alternative discharge circuit configured to activate to discharge the output capacitor in response to programming the programmable output voltage from a high voltage level to a low voltage level.
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Accused Products
Abstract
Apparatus and methods for programmable low dropout (LDO) regulators for radio frequency (RF) electronics are provided herein. In certain configurations, an LDO regulator for generating a programmable output voltage includes a regulation field-effect transistor (FET) having a drain electrically connected to the LDO regulator'"'"'s output, an error amplifier that controls a gate of the regulation FET, a feedback circuit that provides a feedback signal to an inverting input of the error amplifier, an output capacitor electrically connected to the LDO regulator'"'"'s output, and an alternative discharge circuit. When the output voltage of the LDO regulator is programmed from a high voltage level to a low voltage level, the alternative discharge circuit activates to discharge the output capacitor to improve the LDO regulator'"'"'s transient response.
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Citations
21 Claims
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1. A programmable low dropout regulator comprising:
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an error amplifier including an output and a first input; a regulation field-effect transistor including a gate electrically connected to the output of the error amplifier and a drain electrically connected to an output node configured to provide a programmable output voltage that is programmable to a plurality of different voltage levels; a feedback circuit electrically connected between the output node and a first voltage, the feedback circuit configured to provide a feedback signal to the first input of the error amplifier; an output capacitor electrically connected to the output node; and an alternative discharge circuit configured to activate to discharge the output capacitor in response to programming the programmable output voltage from a high voltage level to a low voltage level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 21)
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9. A power amplifier system comprising:
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a multi-stage power amplifier including a driver stage; and a programmable low dropout regulator including an output that powers the driver stage with a programmable output voltage that is programmable to a plurality of different voltage levels, the programmable low dropout regulator including an error amplifier, a regulation field-effect transistor including a gate electrically connected to an output of the error amplifier and a drain electrically connected to the output of the programmable low dropout regulator, a feedback circuit configured to provide feedback to a first input of the error amplifier based on a voltage level of the programmable output voltage, an output capacitor electrically connected to the output of the programmable low dropout regulator, and an alternative discharge circuit configured to activate to discharge the output capacitor in response to programming the programmable output voltage from a high voltage level to a low voltage level. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of voltage regulation in a programmable low dropout regulator, the method comprising:
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controlling a gate of a regulation field-effect transistor using an error amplifier; regulating an output voltage provided at an output node using the regulation field-effect transistor; generating a feedback signal for a first input of the error amplifier based on a voltage level of the output voltage using a feedback circuit; stabilizing the output voltage using an output capacitor; programming the output voltage from a high voltage level to a low voltage level; and activating an alternative discharge circuit to discharge the output capacitor in response to programming the output voltage from the high voltage level to the low voltage level. - View Dependent Claims (18, 19, 20)
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Specification