Progressive envelope tracking with delay compensation
AssigneeQorvo US, Inc.
InventorsNadim Khlat, Mohammad Ahsanul Adeeb
Life of this patent
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Abstract
A progressive envelope tracking (ET) with delay compensation includes an ET integrated circuit (IC) (ETIC) that is a progressive ETIC that switches between different driver amplifiers having different associated offset voltages based on a tracking signal (e.g., Vramp) from a baseband transceiver. To make sure that desired changes to the offset voltage occur contemporaneously with an input signal for the driver amplifiers, a delay may be added to the input signal for the driver amplifiers. By adding and controlling this delay to the input to the driver amplifiers, the changes to the offset voltage will track the changes to the input signal at the driver amplifiers and overall efficiency of the ETIC may be improved.
Claims18
An envelope tracking (ET) integrated circuit (IC) (ETIC) comprising:
- an input configured to receive a vramp signal from a baseband transceiver;
- a first driver amplifier coupled to a first offset capacitor and a first variable feedback circuit;
- a second driver amplifier coupled to a second offset capacitor, the first variable feedback circuit, and a second variable delay circuit;
- and
- a controller circuit configured to:
- switch between the first driver amplifier and the second driver amplifier;
- and
- adjust a first delay for a first path that extends from a node to the second driver amplifier through the second variable delay circuit to match a second delay for a second path that extends from the node to the second driver amplifier through the controller circuit.
A wireless device comprising:
- a baseband transceiver configured to produce a vramp signal;
- an envelope tracking (ET) integrated circuit (IC) (ETIC) coupled to the baseband transceiver, the ETIC comprising:
- an input configured to receive the vramp signal;
- a first driver amplifier coupled to a first offset capacitor and a first variable feedback circuit;
- a second driver amplifier coupled to a second offset capacitor, the first variable feedback circuit, and a second variable delay circuit;
- and
- a controller circuit configured to:
- switch between the first driver amplifier and the second driver amplifier;
- and
- adjust a first delay for a first path that extends from a node to the second driver amplifier through the second variable delay circuit to match a second delay for a second path that extends from the node to the second driver amplifier through the controller circuit.
Dependencies are inferred from the claim text.