Envelope tracking amplifier circuit
First Claim
1. An envelope tracking (ET) amplifier circuit comprising:
- an output node configured to provide an ET modulated voltage to at least one amplifier circuit for amplifying a radio frequency (RF) signal;
ET tracker circuitry comprising;
a tracker input configured to receive an ET modulated target voltage; and
a tracker output coupled to the output node and configured to output the ET modulated voltage tracking the ET modulated target voltage;
fast switcher circuitry coupled to the tracker output; and
a fast switcher controller configured to;
receive a time-advanced sense current indicative of an alternate current (AC) current sourced by the ET tracker circuitry and a determined timing advance relative to the ET modulated target voltage; and
activate the fast switcher circuitry to provide the AC current to the tracker output in response to the time-advanced sense current indicating that the AC current sourced by the ET tracker circuitry is greater than zero.
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Accused Products
Abstract
Aspects disclosed in the detailed description include an envelope tracking (ET) amplifier circuit. The ET amplifier circuit includes ET tracker circuitry configured to provide an ET modulated voltage, which tracks an ET modulated target voltage, to an amplifier circuit(s) for amplifying a radio frequency (RF) signal. The ET amplifier circuit also includes fast switcher circuitry that is activated to provide an alternate current (AC) current to the amplifier circuit(s) when the RF signal includes a higher number of resource blocks (RBs). However, the fast switcher circuitry and its associated control circuitry may incur a processing delay that can cause the fast switcher circuitry to lag behind the ET modulated target voltage. As such, the ET amplifier circuit further includes timing adjustment circuitry to help compensate for the processing delay, thus helping to maintain efficiency of the ET tracker circuitry for improved performance of the ET amplifier circuit.
84 Citations
20 Claims
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1. An envelope tracking (ET) amplifier circuit comprising:
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an output node configured to provide an ET modulated voltage to at least one amplifier circuit for amplifying a radio frequency (RF) signal; ET tracker circuitry comprising; a tracker input configured to receive an ET modulated target voltage; and a tracker output coupled to the output node and configured to output the ET modulated voltage tracking the ET modulated target voltage; fast switcher circuitry coupled to the tracker output; and a fast switcher controller configured to; receive a time-advanced sense current indicative of an alternate current (AC) current sourced by the ET tracker circuitry and a determined timing advance relative to the ET modulated target voltage; and activate the fast switcher circuitry to provide the AC current to the tracker output in response to the time-advanced sense current indicating that the AC current sourced by the ET tracker circuitry is greater than zero. - 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