Nonlinear bandwidth compression circuitry
First Claim
1. Nonlinear bandwidth compression circuitry comprising:
- an input node, an output node, and a reference node;
control circuitry comprising;
a reference input interface coupled to the reference node;
an output interface coupled to the output node;
one or more input interfaces; and
a feedback interface;
positive slew rate circuitry coupled to the control circuitry and comprising;
a delay path provided between the input node and the reference node; and
one or more combiners provided in parallel between the delay path and the one or more input interfaces in the control circuitry, respectively; and
negative slew rate circuitry coupled to the control circuitry and comprising feedback circuitry provided between the output interface and the feedback interface.
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Abstract
Nonlinear bandwidth compression circuitry is provided. In examples discussed herein, nonlinear bandwidth compression circuitry can be configured to modify predefined amplitude(s) of a predefined voltage waveform to generate modified amplitude(s) of a modified voltage waveform that is never less than the predefined amplitude(s) of the predefined voltage waveform. Thus, by providing the nonlinear bandwidth compression circuitry in an envelope tracking (ET) system to perform bandwidth compression, signal distortion(s) resulted from the bandwidth compression can be corrected (e.g., via digital pre-distortion). As such, the ET system can amplify a radio frequency (RF) signal having a signal modulation bandwidth exceeding a voltage modulation bandwidth limitation of the ET system, without degrading spectral performance of the RF signal.
90 Citations
20 Claims
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1. Nonlinear bandwidth compression circuitry comprising:
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an input node, an output node, and a reference node; control circuitry comprising; a reference input interface coupled to the reference node; an output interface coupled to the output node; one or more input interfaces; and a feedback interface; positive slew rate circuitry coupled to the control circuitry and comprising; a delay path provided between the input node and the reference node; and one or more combiners provided in parallel between the delay path and the one or more input interfaces in the control circuitry, respectively; and negative slew rate circuitry coupled to the control circuitry and comprising feedback circuitry provided between the output interface and the feedback interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification