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Radio frequency pulse width modulation method based on phase shift control, modulator and transmitter

A technology of pulse width modulator and pulse width modulation signal, applied in the direction of pulse duration/width modulation, baseband system, phase modulation carrier system, etc., which can solve the thermal mismatch of switching power tubes, large loss and temperature rise of switching power tubes Differences, device failures, etc., to achieve power balance, simplify modulator configuration, and improve coding efficiency

Pending Publication Date: 2022-03-11
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, for the 2 bridge arms of the H-bridge Class D power amplifier with a total of 4 switching power tubes, since the 2 switching power tubes of each bridge arm are complementary to conduction, it always makes the upper switching power tubes of the 2 bridge arms (Q 1 , Q 2 ) conduction time is less than or equal to half cycle, while the lower switching power tube (Q 3 , Q 4 ) conduction time is greater than or equal to half cycle, that is, Q 1 , Q 2 The output power and power dissipation are always less than Q 3 , Q 4 , with the accumulation of working time, there will be a large difference in loss and temperature rise among the switching power tubes in the H-bridge class D power amplifier, which will cause thermal mismatch problems in the switching power tubes, and due to power tubes (such as QaN The positive temperature characteristic of HMET) will make the thermal mismatch problem more serious, causing additional loss, nonlinearity and device failure problems

Method used

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  • Radio frequency pulse width modulation method based on phase shift control, modulator and transmitter
  • Radio frequency pulse width modulation method based on phase shift control, modulator and transmitter
  • Radio frequency pulse width modulation method based on phase shift control, modulator and transmitter

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Embodiment 1

[0071] Such as figure 2 As shown, the present invention discloses a radio frequency pulse width modulation method based on phase shift control, the method comprising:

[0072] Step S1: Obtain the baseband in-phase signal and quadrature signal.

[0073] Step S2: Generate two reference phase signals according to the in-phase signal and the quadrature signal.

[0074] Step S3: Converting the two reference phase signals respectively according to the radio frequency carrier frequency to obtain two phase modulation reference signals.

[0075] Step S4: Carry out zero-crossing comparison on the two phase modulation reference signals respectively to obtain two radio frequency pulse width modulation signals, so that the switch mode power amplifier can be directly driven by the two radio frequency pulse width modulation signals; the two radio frequency pulse width modulation signals The pulse width is fixed at half an RF cycle.

[0076] Each step is described in detail below:

[007...

Embodiment 2

[0098] Such as Figure 4 As shown, the present invention discloses a radio frequency pulse width modulator based on phase shift control, the radio frequency pulse width modulator has 3 input terminals and 2 output terminals, and the radio frequency pulse width modulator includes:

[0099] The phase shift control unit 11 has 2 input terminals and 2 output terminals, 2 input terminals are used to receive baseband in-phase signal I and quadrature signal Q, and 2 output terminals are used to output two reference phase signals S Φ -S θ and S Φ +S θ . The phase shift control unit 11 is used to generate two reference phase signals S according to the in-phase signal I and the quadrature signal Q Φ -S θ and S Φ +S θ .

[0100] The phase modulation unit 12 has 3 input terminals and 2 output terminals, wherein the 2 input terminals are respectively coupled to the 2 output terminals of the phase shift control unit 11 for receiving two reference phase signals S Φ -S θ and S Φ +S...

Embodiment 3

[0108] Such as Figure 5 As shown, the present invention also discloses an all-digital transmitter, which includes a switch mode power amplifier 20, an output filter 30 and the radio frequency pulse width modulator 10 in Embodiment 2.

[0109] The radio frequency pulse width modulator 10 is used for two-way radio frequency pulse width modulation signal S generated according to the baseband in-phase signal I and quadrature signal Q RFPWM1 and S RFPWM2 .

[0110] The switch mode power amplifier 20 is coupled to the output end of the RF pulse width modulator 10, and is used to receive the two-way RF pulse width modulation signal S output by the RF pulse width modulator 10 RFPWM1 and SRFPWM2 , and according to the received two RF pulse width modulation signals S RFPWM1 and S RFPWM2 Drive and control switch power amplification, generate and output digital radio frequency power signal S that meets the transmission power DRF_POWER .

[0111] The output filter 30 is coupled to t...

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Abstract

The invention relates to a radio frequency pulse width modulation method based on phase shift control, a modulator and a transmitter. The method comprises the following steps: firstly, generating two paths of reference phase signals according to an in-phase signal and an orthogonal signal; respectively converting the two reference phase signals according to the radio frequency carrier frequency to obtain two phase modulation reference signals; and finally, performing zero-crossing comparison on the two paths of phase modulation reference signals to obtain two paths of radio frequency pulse width modulation signals. According to the invention, zero-crossing comparison is carried out on the two paths of phase modulation signals with the phase difference of a specific angle, so that related circuits required for predistortion compensation and threshold level generation of amplitude signals are omitted, the maximum amplitude of the normalized amplitude signals is not limited any more, and the coding efficiency of radio frequency pulse width modulation is improved. Besides, the pulse widths of the two paths of radio frequency pulse width modulation signals are fixed to be a half radio frequency period, so that power consumption balance of the switching power tubes in the switching power amplifier can be automatically realized, and various problems caused by thermal mismatch of the switching power tubes are avoided.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a radio frequency pulse width modulation method based on phase shift control, a modulator and a transmitter. Background technique [0002] The transmitter is one of the important components of the wireless communication system. Its role is to up-convert the modulated baseband signal to radio frequency (RF), and amplify the radio frequency signal to a power level sufficient for antenna transmission. It is the main factor that determines the output signal quality and work efficiency of the wireless communication system. Smaller size, lower power consumption, higher communication rate, digitization and reconfigurability are the development directions of the transmitter. In recent years, direct digital radio frequency modulation (DDRFM), switch mode power amplifier (SMPA), high-efficiency tuned filters, and broadband digital transmitter (DTx) technologies have develope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/49H04L27/20H03K7/08
CPCH04L25/4902H04L27/20H03K7/08
Inventor 周强魏志虎陈章朱蕾张建亚
Owner NAT UNIV OF DEFENSE TECH