Envelope tracking drain modulator, radio frequency amplifying circuit and method
A technology of drain modulation and envelope tracking, which is applied to high-frequency amplifiers, power amplifiers, and improved amplifiers to reduce temperature/power supply voltage changes, etc. It can solve the problems of poor use efficiency of high-power radio frequency signals and improve use efficiency , good tracking matching effect
Active Publication Date: 2017-10-10
XIAOMI INC
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[0004] In the process of implementing the present disclosure, the discloser found that the above-mentioned method has at least the following defects: when the linear amplification part 144 tracks the envelope signal, the use efficiency of the low-power radio frequency signal is improved, and the high-power radio frequency signal is improved. Inefficient use
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[0044] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present disclosure, not all of them. . Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.
[0045] figure 2 It is a schematic structural diagram of an envelope tracking drain modulator according to an exemplary embodiment, and the envelope tracking drain modulator is suitable for a radio frequency circuit in a mobile communication device. The envelope tracking drain modulator may include: an envelope detection unit 210 , a linear amplification unit 220 , a switch unit 230 and a restoration unit 240 .
[0046] The envelope detection...
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The invention relates to an envelope tracking drain modulator, a radio frequency amplifier circuit and an envelope tracking method and belongs to the field of application of electronics. The envelope tracking method includes the steps: an envelope detection unit acquires a corresponding envelope signal from an input radio frequency signal; a linear amplifier unit receives the envelope signal acquired by the envelope detection unit, the envelope signal is amplified according to preset times, and first tracking voltage is output according to the amplified envelope signal; a switching unit generates pulse width voltage corresponding to the envelope signal according to the envelope signal acquired by the envelope detection unit; a reduction unit reduces the pulse width voltage generated by the switching unit into second tracking voltage corresponding to the pulse width voltage, and the first tracking voltage and the second tracking voltage are superposed and output as drain regulation voltage of a radio frequency power amplifier. The envelope tracking drain modulator, the radio frequency amplifier circuit and the envelope tracking method have the advantages that radio frequency signals can be subjected to tracking matching better and utilization efficiency of the radio frequency power amplifier is improved accordingly.
Description
technical field [0001] The present disclosure relates to the application field of electronic technology, in particular to an envelope tracking drain modulator, a radio frequency amplifier circuit and a method. Background technique [0002] The RF power amplifier is the device with the largest power consumption in the RF module in the mobile phone circuit system. As the core front-end part of the entire RF module, the efficiency of the RF power amplifier will affect the efficiency of the entire mobile phone system, thereby affecting the battery power supply time. [0003] There is an ET (Envelope tracking, envelope tracking) technology among related technologies for improving the efficiency of use of radio frequency power amplifiers. Please refer to figure 1 , which shows a schematic structural diagram of a radio frequency amplifier circuit using ET technology. The radio frequency amplifying circuit includes a coupler 120 , an envelope tracking drain modulator 140 , a dela...
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IPC IPC(8): H03F1/30H03F3/20H03F3/189
Inventor 王利底浩李伏海
Owner XIAOMI INC