Amplifier with output AC coupled envelope tracking supply

A device, comprising:

• a first circuit configured to:
• receive a first signal to indicate a first amount of voltage provided by a first source;
• receive a second signal to indicate a second amount of voltage provided to a driver;
• and
• provide a third signal having a first level in response to a level of the first signal being larger than a level of the second signal and the third signal having a second level in response to the level of the second signal being larger than the level of the first signal;
• a second circuit configured to:
• receive a fourth signal to indicate a third amount of voltage provided by the driver;
• receive a fifth signal to indicate the second amount of voltage;
• and
• provide a sixth signal having a first level in response to a level of the fourth signal being larger than a level of the fifth signal and the sixth signal having a second level in response to the level of the fifth signal being larger than the level of the fourth signal;
• a third circuit configured to:
• receive the third signal and the sixth signal;
• and
• provide a seventh signal to indicate whether to:
• track a difference between the second amount of voltage and the third amount of voltage;
• or
• track a difference between the first amount of voltage and the second amount of voltage;
• a first component configured to electrically couple the driver with the first source in response to the seventh signal having a first level;
• and
• a second component configured to electrically couple the driver with a second source in response to the seventh signal having a second level.

A method for tracking signals of a driver, the method comprising:

• receiving, by a first circuit, a first signal and a second signal, the first signal to indicate a first amount of voltage provided by a first source, and the second signal to indicate a second amount of voltage provided to the driver;
• providing, by the first circuit, a third signal having a first level in response to a level of the first signal being larger than a level of the second signal and the third signal having a second level in response to the level of the second signal being larger than the level of the first signal;
• receiving, by a second circuit, a fourth signal and a fifth signal, the fourth signal to indicate a third amount of voltage provided by the driver, and the fifth signal to indicate the second amount of voltage;
• providing, by the second circuit, a sixth signal having a first level in response to a level of the fourth signal being larger than a level of the fifth signal and the sixth signal having a second level in response to the level of the fifth signal being larger than the level of the fourth signal;
• receiving, by a third circuit, the third signal and the sixth signal;
• providing, by the third circuit, a seventh signal to indicate whether to:
• track a difference between the second amount of voltage and the third amount of voltage;
• or
• track a difference between the first amount of voltage and the second amount of voltage;
• the level of the second signal has a first level in response to the first source providing a first level of the second amount of voltage;
• the second signal has a second level in response to a second source providing a second level of the second amount of voltage;
• and
• the second level of the second signal is larger than the first level of the second signal.

A system, comprising:

• a device including:
• a first circuit configured to:
• receive a first signal to indicate a first amount of voltage provided by a first source;
• receive a second signal to indicate a second amount of voltage provided to a driver;
• and
• provide a third signal having a first level in response to a level of the first signal being larger than a level of the second signal and the third signal having a second level in response to the level of the second signal being larger than the level of the first signal;
• a second circuit configured to:
• receive a fourth signal to indicate a third amount of voltage provided by the driver, wherein the fourth signal has a first range in response to the first source providing a first level of the second amount of voltage, wherein the fourth signal has a second range in response to a second source providing a second level of the second amount of voltage, and wherein the first range is different than the second range;
• receive a fifth signal to indicate the second amount of voltage;
• and
• provide a sixth signal having a first level in response to a level of the fourth signal being larger than a level of the fifth signal and the sixth signal having a second level in response to the level of the fifth signal being larger than the level of the fourth signal;
• and
• a third circuit configured to:
• receive the third signal and the sixth signal;
• and
• provide a seventh signal to indicate whether to:
• track a difference between the second amount of voltage and the third amount of voltage;
• or
• track a difference between the first amount of voltage and the second amount of voltage.

A system, comprising:

• a device including:
• a first circuit configured to:
• receive a first signal to indicate a first amount of voltage provided by a first source;
• receive a second signal to indicate a second amount of voltage provided to a driver;
• and
• provide a third signal having a first level in response to a level of the first signal being larger than a level of the second signal and the third signal having a second level in response to the level of the second signal being larger than the level of the first signal;
• a second circuit configured to:
• receive a fourth signal to indicate a third amount of voltage provided by the driver;
• receive a fifth signal to indicate the second amount of voltage;
• and
• provide a sixth signal having a first level in response to a level of the fourth signal being larger than a level of the fifth signal and the sixth signal having a second level in response to the level of the fifth signal being larger than the level of the fourth signal;
• a third circuit configured to:
• receive the third signal and the sixth signal;
• and
• provide a seventh signal to indicate whether to:
• track a difference between the second amount of voltage and the third amount of voltage;
• or
• track a difference between the first amount of voltage and the second amount of voltage;
• and
• a first component, in response to the seventh signal having a first level, configured to:
• electrically couple a second component with the first circuit to adjust the level of the first signal from a first level to a second level;
• and
• produce, responsive to adjustment of the first signal from the first level to the second level, a threshold between the first signal and the second signal.