Modulated supply amplifier with adjustable input parameter configuration
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorsAli Afsahi, Debopriyo Chowdhury, Rethnakaran Pulikkoonattu, Sraavan Reddy Mundlapudi
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Abstract
An amplifier may include control circuitry that may track a first input signal parameter and, in response, adjust a value of a second input parameter. Input parameter tracking and adjustment may facilitate control of output parameters for the amplifier. For example, an envelope-tracking amplifier may track input signal amplitude and adjust other input parameters in response. The adjustments may facilitate control of output parameters, such as gain or efficiency. The amplifier may further include calibration circuitry to determine adjustment responses to various tracked input parameters.
Claims20
A device comprising:
- a modulated supply (MS) power amplifier;
- a MS output configured to provide a MS voltage that is dynamically varied responsive to MS information indicative of an envelope of an input signal to the MS power amplifier;
- and
- a cascode control output configured to provide a cascode gate voltage that is dynamically varied responsive to the MS information, the cascode gate voltage generated in parallel to the MS voltage,
- wherein the MS power amplifier comprises:
- a power amplifier supply input configured to receive the MS voltage from the MS output;
- and
- a cascode gate input configured to receive the cascode gate voltage from the cascode control output.
A device comprising:
- a modulated supply (MS) power amplifier comprising:
- a voltage supply input;
- and
- multiple power amplifier fingers coupled to the voltage supply input;
- baseband circuitry configured to generate MS information indicative of a time-varying voltage level at the voltage supply input;
- and
- MS control circuitry in data communication with the baseband circuitry, the MS control circuitry configured to:
- receive the MS information from the baseband circuitry;
- and
- responsive to the MS information, dynamically activate a selected number of the multiple power amplifier fingers.
A method comprising:
- setting a first input parameter of a modulated supply (MS) at a first value;
- performing amplification of a calibration signal at a plurality of different values of a second input parameter of the MS with the first input parameter of the MS being held constant at the first value;
- obtaining first output values for an output parameter of the MS at least based on the amplification of the calibration signal at the plurality of different values of the second input parameter of the MS with the first input parameter of the MS being held constant at the first value;
- setting the first input parameter of the MS at a second value;
- performing amplification of the calibration signal at the plurality of different values of the second input parameter of the MS with the first input parameter of the MS being held constant at the second value;
- obtaining second output values for the output parameter of the MS at least based on the amplification of the calibration signal at the plurality of different values of the second input parameter of the MS with the first input parameter of the MS being held constant at the second value;
- obtaining a criterion for the output parameter of the MS;
- determining a criterion-matching output value by searching, from the plurality of first output values and the plurality of second output values, an output value that meets the criterion;
- and
- selecting calibration values for the first and second input parameters of the MS based at least in part on the determined criterion-matching output value.
Dependencies are inferred from the claim text.