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Envelope tracking circuit and method with adaptive switching frequency

A technology of envelope tracking and switching frequency, applied to amplifiers with semiconductor devices/discharge tubes, electrical components, components of amplifiers, etc., can solve problems such as noise and loss

Inactive Publication Date: 2020-08-11
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The switching regulator stage 102 improves the efficiency of ET, but is noisy
The linear regulator stage 101 is faster and ensures the optimum supply voltage to achieve the peak efficiency of the PA, but has (power) losses
Unfortunately, noise and efficiency are conflicting performance requirements
[0005] Achieving power efficiency and noise performance over a wide bandwidth of the envelope waveform is a challenge for conventional envelope tracking amplifiers

Method used

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  • Envelope tracking circuit and method with adaptive switching frequency
  • Envelope tracking circuit and method with adaptive switching frequency
  • Envelope tracking circuit and method with adaptive switching frequency

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Embodiment Construction

[0014] The present disclosure relates to envelope tracking circuits and methods with adaptive switching frequency. In the following description, for purposes of explanation, numerous examples and specific details are set forth in order to provide a thorough understanding of the present disclosure. However, it will be apparent to those skilled in the art that the present disclosure expressed in the claims may include some or all of the features of these embodiments alone, or in combination with other features described below, and may also include references to the features and concepts described herein. modifications and equivalents.

[0015] In wireless applications, switching frequency is a key parameter to achieve a trade-off between efficiency and receiver band noise (RXBN). For higher efficiency it is desirable to have the switching frequency as high as possible. For lower noise, it is desirable to make the switching frequency much smaller than the frequency offset betwe...

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Abstract

The present disclosure includes envelope tracking circuits and methods with adaptive switching frequency. In one embodiment, a circuit includes an amplifier to receive an envelope tracking signal having an envelope tracking frequency and output a voltage and current to a power supply terminal of a power amplifier circuit. A programmable comparator receives an output signal from the amplifier and generates a switching signal with a switching frequency. The switching regulator stage receives switching signals and outputs switching currents to power supply terminals. A frequency comparison circuit configures the programmable comparator based on the ET frequency and the switching frequency such that the switching frequency tracks the ET frequency.

Description

[0001] related application [0002] This application claims priority to US Application No. 14 / 675,424, filed March 31, 2015, the entire contents of which are incorporated herein by reference for all purposes. technical field [0003] The present disclosure relates to electronic circuits and methods, and more particularly to envelope tracking circuits and methods with adaptive switching frequency. Background technique [0004] Envelope tracking (ET) is a technique aimed at improving the efficiency of a power amplifier (PA) by continuously adjusting the power amplifier's supply voltage according to the signal envelope to improve efficiency during transmission. figure 1 An example configuration of one type of envelope tracking system is shown. In this example, an input signal Vin is provided at the input of a power amplifier (PA) 103 to generate a power amplified signal Vout. PA 103 receives supply voltage Vdd and supply current Idd from the configuration of linear amplifie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/02
CPCH03F1/0222H03F2200/102H03F2200/453H03F2200/78H03F3/211H03F1/0216
Inventor J·勒尔德沃拉塔维施宋L·K-A·玛西
Owner QUALCOMM INC
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