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US 9,520,907 B2Granted
Methods and apparatus for envelope tracking system
AssigneeMediatek Inc.
InventorsChia-Sheng Peng, Wei-Cheng Liu, Sheng-Hong Yan, Paul Cheng Po Liang
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Abstract
A communication unit comprises a radio frequency, RF, transmitter comprising: a power amplifier, PA, module; an envelope tracking system operably coupled to the PA module and arranged to variably control a supply voltage for the PA module; and a load control system operably coupled to an output of the PA module and arranged to control a power amplifier output load.
Claims7
A communication unit comprising a radio frequency, RF, transmitter comprising:
- a transmit path comprising:
- a digital predistortion, DPD, module arranged to receive and distort an input transmit signal;
- an RF transmit block arranged to receive the distorted transmit signal and to amplify and up-convert the distorted transmit signal and apply the amplified, up-converted distorted transmit signal to the PA module;
- and
- a power amplifier, PA, module;
- and
- an envelope tracking system comprising:
- an envelope detector arranged to detect an instantaneous envelope of the input transmit signal;
- an envelope to supply mapping component arranged to set a supply voltage level based on the detected envelope;
- and
- a supply modulator operably coupled to a supply of the PA module and arranged to variably control a supply voltage therefor;
- wherein the RF transmitter further comprises a power controller operably coupled and arranged to receive a transmit power outputted from the RF transmitter in order to set levels within each of:
- the DPD module, the RF transmit block, envelope to supply mapping component.
10 more elements
A communication unit comprising a radio frequency, RF, transmitter comprising:
- a digital predistortion, DPD, module arranged to receive and distort an input transmit signal,
- an RF transmit block arranged to receive the distorted transmit signal and to amplify and up-convert the distorted transmit signal and apply the amplified up-converted distorted transmit signal to the PA module;
- and
- a power amplifier, PA, module;
- an envelope tracking system comprising:
- an envelope detector arranged to detect an instantaneous envelope of the input transmit signal;
- an envelope to supply mapping component arranged to set a supply voltage level based on the detected envelope;
- and
- a supply modulator operably coupled to a supply of the PA module and arranged to variably control a supply voltage therefor;
- a switchable transformer-based voltage combiner operably coupled to a plurality of power amplifiers, PAs, of the PA module, wherein an output power of the PA module is selectable by applying the amplified, up-converted distorted transmit signal concurrently to a number of PAs;
- and
- a combiner controller operably coupled to respective inputs of the plurality of PAs by respective switches and arranged to switch the amplified, up-converted distorted transmit signal to a number of the PAs according to an operating arrange output power of the combined PAs;
- wherein the RF transmitter further comprises a power controller operably coupled and arranged to set levels within each of:
- the DPD module, the RF transmit block, the envelope to supply mapping component.
11 more elements
Dependencies are inferred from the claim text.