The patent's assignee for patent number 8744382 is
News editors obtained the following quote from the background information supplied by the inventors: "A modern wireless communication system, such as Code Division Multiple Address (CDMA), Wideband Code Division Multiple Address (WCDMA), Universal Mobile Telecommunication System (UMTS), Long Term Evolution (LTE), is a variable envelope modulation technology which sufficiently utilizes frequency spectrum and simultaneously adopts amplitude modulation and phase modulation. The technology has a higher Peak-to-Average Power Ratio (PAPR) and a wider dynamic range, while an excessively high PAPR causes a transmitting end to impose a very high requirement on linearity of a power amplifier and usually to run below an envelope peak level.
"The variable envelope modulation technology needs to use a linear power amplifier to amplify a signal, which is realized generally by adopting an Envelope Tracking (ET) based technology in order to guarantee a linearity and increase a power amplification efficiency. As shown in FIG. 1, a radio frequency signal is input, then is driven and amplified by a driving amplifier, and is output to a radio frequency power amplifier. Meanwhile, an envelope detector retrieves an envelope waveform signal of the radio frequency signal, the envelope signal is amplified through a fast tracking power supply, and the amplified envelope signal is used as radio frequency power amplifier drain voltage; and finally the amplified radio frequency signal is output by the radio frequency power amplifier.
"With the development of multi-carrier technology, when the fast tracking power supply is linearly amplifying the retrieved envelope signal, a higher requirement is imposed on a bandwidth and an efficiency of the fast tracking power supply. For example, in the procedure of performing envelope amplification, a bandwidth of the envelope signal can be up to dozens of MHz, it is very difficult for a bandwidth of an ordinary switch power supply to satisfy a requirement of an ET bandwidth due to limitation of such factors as a semiconductor technology and a switch frequency. Furthermore, output noise and distortion are modulated to a carrier, which results in out-of-band spectrum spreading and seriously influences an Adjacent Channel Power Ratio (ACPR) of the signal. Hence, a new high efficiency and high bandwidth fast tracking power supply is required to adapt to continuously developing application demands."
As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "Accordingly, the present invention is directed to a fast tracking power supply device, a fast tracking power supply control method, and communication equipment, which are configured to output a high bandwidth and high efficiency tracking power supply.
"An embodiment of the present invention provides a fast tracking power supply device, where the device includes:
"a basic voltage output unit, including a level providing unit, configured to provide one or more level outputs; and a level switching unit, configured to switch and select the level output in the level providing unit according to a received first control signal, and output a basic voltage;
"a compensation voltage output unit, including a basic current output unit and a linear amplifier;
"in which, the linear amplifier is connected in parallel with the basic current output unit, and then is connected in series with the basic voltage output unit;
"the basic current output unit includes a current source providing unit, configured to provide one or more constant current sources; and a current switching unit, configured to switch and select the constant current source in the current source providing unit according to a received second control signal, and output a basic current; and
"the linear amplifier is configured to output a compensation current, and output a compensation voltage according to a third control signal; and the compensation current is configured to compensate the basic current, and the compensation voltage is configured to compensate the basic voltage.
"An embodiment of the present invention further provides a fast tracking power supply control method, based on the fast tracking power supply device according to the embodiment of the present invention, where the method includes:
"controlling the level switching unit according to a reference signal to switch and select a level output provided in the level providing unit, so as to output a basic voltage;
"controlling the current switching unit according to the reference signal to switch and select a current provided in the current providing unit, so as to output a basic current; and
"controlling the linear amplifier according to the reference signal to output a compensation voltage, and determining a compensation current output by the linear amplifier according to a load current and the basic current, in which the compensation voltage is configured to compensate the basic voltage; and the compensation current is configured to compensate the basic current.
"An embodiment of the present invention further provides communication equipment, where the communication equipment includes:
"a radio frequency amplification unit, configured to perform radio frequency amplification on a received radio frequency signal; and
"a processing unit, configured to process the radio frequency signal amplified by the radio frequency amplification unit;
"in which, the radio frequency amplification unit includes:
"an envelope detector, configured to detect an envelope of the received radio frequency signal, and obtain an envelope signal;
"the fast tracking power supply device according to the embodiment of the present invention, configured to receive the envelope signal output by the envelope detector, and amplify the envelope signal;
"a driving amplifier, configured to amplify the received radio frequency signal; and
"a radio frequency power amplifier, configured to receive the envelope signal amplified by the fast tracking power supply and the amplified signal output by the driving amplifier, and amplify the radio frequency signal.
"The technical solution has the following advantages.
"According to the embodiments of the present invention, the basic voltage output unit outputs a high efficiency, low bandwidth, and low precision signal, and the linear amplifier outputs a low efficiency, high bandwidth, and high precision signal. A high bandwidth and high precision signal is output after the basic voltage output unit and the linear amplifier are connected in series, and the efficiency is higher than the efficiency when only the linear amplifier is used. Meanwhile, the linear amplifier is further connected in parallel with the high efficiency, low bandwidth, and low precision basic current output unit, and the basic current output unit provides the basic current, so the output current of the linear amplifier can be reduced, and the output power of the linear amplifier can be reduced, so that power loss caused by the low output efficiency of the linear amplifier is reduced, so as to further promote the efficiency of the entire fast tracking power supply device."
For additional information on this patent, see: Hou, Zhaozheng; Liu, Xujun. Fast Tracking Power Supply Device, Fast Tracking Power Supply Control Method, and Communication Equipment. U.S. Patent Number 8744382, filed
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