Transfer function regulation
AssigneeSnapTrack, Inc.
InventorNicholas Shute
Life of this patent
Estimating the term…
Abstract
The invention relates to a technique for controlling in an envelope tracking amplification stage, comprising: determining a representation of the output signal of the amplifier; determining a representation of the input signal of the amplifier; adjusting the determined representation of the input signal according to a target characteristic of the amplifier; comparing the adjusted input and determined representation of the output; and generating a control signal in dependence on the comparison.
Claims10
A method for controlling in an envelope tracking amplification stage comprising an amplifier, the method comprising:
- determining a representation of an output signal of the amplifier;
- determining a representation of an input signal of the amplifier;
- adjusting the determined representation of the input signal according to a target characteristic of the amplifier;
- comparing the adjusted representation of the input signal and the determined representation of the output signal;
- and
- generating a control signal based on the comparison,
- wherein at least one of:
- the target characteristic is an AM-AM characteristic, the control signal is an amplitude control signal, and the control signal modifies a shaping function applied to an envelope of the input signal, or
- the target characteristic is a PM-PM characteristic, the control signal is a phase control signal, and the control signal modifies a phase of the input signal.
An envelope tracking amplification stage comprising an envelope path and an input signal path, the envelope tracking amplification stage comprising:
- a target block configured to adjust a representation of an input signal of an amplifier according to a target characteristic of the amplification stage;
- and
- a comparator configured to compare the adjusted representation of the input signal to a representation of an output signal of the amplifier, and configured to generate a control signal based on the comparison,
- wherein at least one of:
- the target characteristic is an AM-AM characteristic, and the control signal is an amplitude control signal, the amplitude control signal being configured to modify a shaping function applied to an envelope of the input signal, or
- the target characteristic is a PM-PM characteristic, the control signal is a phase control signal, the envelope tracking amplification stage further comprising an element configured to modify the input signal in the input path to the amplifier, receive the control signal, and modify the phase of the input signal.
Dependencies are inferred from the claim text.