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US 9,288,098 B2Granted
Methods and apparatus for envelope tracking system
AssigneeMediatek Inc.
InventorsSheng-Hong Yan, Hao-Ping Hong
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Abstract
A communication unit has an envelope tracking system operably coupled to a power amplifier, PA, module. The envelope tracking system has at least one slew rate module arranged to re-distribute a slew rate across a number of input samples according to a maximum slew rate of the number of input samples; and a supply modulator arranged to variably control a supply voltage for the PA module in response to an output of the at least one slew rate module.
Claims18
A communication unit comprising:
- an envelope tracking system operably coupled to a power amplifier, PA, module and comprising:
- at least one slew rate module arranged to re-distribute a slew rate across a number of input samples according to a maximum slew rate of the number of input samples, wherein the maximum slew rate is dynamically calculated;
- and
- a supply modulator arranged to variably control a supply voltage for the PA module in response to an output of the at least one slew rate module.
1 more element
A method of envelope tracking in a wireless communication unit, the method comprising:
- receiving an input signal with an envelope that varies with time;
- mapping the envelope of the input signal to a power supply voltage to be applied to a power amplifier module to produce a voltage reference signal;
- sampling the voltage reference signal;
- re-distributing a slew rate across a plurality of input samples of the voltage reference signal according to a maximum slew rate of the plurality of input samples so as to provide an output sample variably controlling a supply voltage for the PA module, wherein the maximum slew rate is dynamically calculated.
1 more element
A communication unit comprising:
- an envelope tracking system operably coupled to a power amplifier, PA, module and comprising:
- at least one slew rate module arranged to re-distribute a slew rate across a number of input samples according to a maximum slew rate of the number of input samples;
- and
- a supply modulator arranged to variably control a supply voltage for the PA module in response to an output of the at least one slew rate module;
- wherein the at least one slew rate module limits a slew rate of an output sequence from the supply modulator to be applied to a supply of the PA module.
2 more elements
A communication unit comprising:
- an envelope tracking system operably coupled to a power amplifier, PA, module and comprising:
- at least one slew rate module arranged to re-distribute a slew rate across a number of input samples according to a maximum slew rate of the number of input samples;
- and
- a supply modulator arranged to variably control a supply voltage for the PA module in response to an output of the at least one slew rate module;
- wherein a slew rate of envelope to reference voltage mapping values of the envelope tracking system is manageable, and the envelope to reference voltage mapping values are utilized to control the supply voltage to be applied to the PA module.
2 more elements
A method of envelope tracking in a wireless communication unit, the method comprising:
- receiving an input signal with an envelope that varies with time;
- mapping the envelope of the input signal to a power supply voltage to be applied to a power amplifier (PA) module to produce a voltage reference signal;
- sampling the voltage reference signal;
- and
- re-distributing a slew rate across a plurality of input samples of the voltage reference signal to provide an output sample variably controlling a supply voltage for the PA module;
- wherein a slew rate of an output sample sequence variably controlling the supply voltage for the PA module is limited.
3 more elements
A method of envelope tracking in a wireless communication unit, the method comprising:
- receiving an input signal with an envelope that varies with time;
- mapping the envelope of the input signal to a power supply voltage to be applied to a power amplifier (PA) module to produce a voltage reference signal;
- sampling the voltage reference signal;
- and
- re-distributing a slew rate across a plurality of input samples of the voltage reference signal to provide an output sample variably controlling a supply voltage for the PA module;
- wherein the step of re-distributing the slew rate across the plurality of input samples of the voltage reference signal comprises calculating a current slew rate S(m) corresponding to a current input sample vpai(n−N+m) of the plurality of input samples.
3 more elements
A method of envelope tracking in a wireless communication unit, the method comprising:
- receiving an input signal with an envelope that varies with time;
- mapping the envelope of the input signal to a power supply voltage to be applied to a power amplifier (PA) module to produce a voltage reference signal;
- sampling the voltage reference signal;
- and
- re-distributing a slew rate across a plurality of input samples of the voltage reference signal to provide an output sample variably controlling a supply voltage for the PA module;
- wherein a slew rate of the output sample variably controlling the supply voltage for the PA module is manageable.
3 more elements
Dependencies are inferred from the claim text.