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US 2014/0194080 A1Published application
Method and apparatus for calibrating time alignment
AssigneeMarvell World Trade Ltd.
InventorsQiang LI, Brian T. BRUNN
Life of this patent
Estimating the term…
Abstract
A method includes setting a circuit to a mode. A test tone having a first frequency is provided to the circuit for use in calibrating the circuit. A received signal is generated based on an output signal of the circuit, the received signal including a component having a second frequency that is a harmonic of the first frequency. A magnitude of the component having the second frequency in the received signal is measured. A delay of the circuit corresponding to the mode is adjusted according to the magnitude of the component.
Claims20
A method comprising:
- setting a circuit to a mode;
- providing a test tone having a first frequency to the circuit for use in calibrating the circuit;
- generating a received signal based on an output signal of the circuit, the received signal including a component having a second frequency that is a harmonic of the first frequency;
- measuring a magnitude of the component having the second frequency in the received signal;
- and
- adjusting a delay of the circuit corresponding to the mode according to the magnitude of the component.
3 more elements
A circuit comprising:
- a test tone generator configured to provide a test tone having a first frequency as a baseband signal for the circuit, the circuit being set to a mode;
- a power amplifier (PA) configured to receive an input signal modulated by the baseband signal;
- an envelope tracking (ET) circuit the ET circuit including an ET delay circuit (ETDC) and configured to modulate a power supply voltage of the PA according to an envelope of the baseband signal;
- and
- an ET delay feedback circuit configured to generate a received signal based on an output of the PA and measure a magnitude of a component having a second frequency in the received signal, the component having the second frequency being a harmonic of the first frequency,
- wherein the ETDC adjusts a delay of the circuit corresponding to the mode according to the component.
3 more elements
Dependencies are inferred from the claim text.