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Power equalization method and modulator for specific harmonic cancellation multi-level radio frequency pulse width modulation

A specific harmonic elimination and pulse width modulation technology, which is applied in the field of wireless communication, can solve problems such as large loss of power tubes and differences in temperature rise, device failure, and thermal mismatch of power tubes.

Active Publication Date: 2020-09-25
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the power is amplified, due to the unbalanced transmission power of multiple SMPA units in the multi-level SMPA and the difference in the working status (such as switching frequency) of each power tube inside the unit, there will be a gap between the units or the power tubes inside the unit. The large difference in loss and temperature rise causes the thermal mismatch problem of the power tube, and due to the positive temperature characteristics of the power tube (such as GaN HMET), the thermal mismatch problem will be more serious, resulting in additional loss, nonlinearity and Device failure problem

Method used

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  • Power equalization method and modulator for specific harmonic cancellation multi-level radio frequency pulse width modulation
  • Power equalization method and modulator for specific harmonic cancellation multi-level radio frequency pulse width modulation
  • Power equalization method and modulator for specific harmonic cancellation multi-level radio frequency pulse width modulation

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specific Embodiment

[0107] As a specific embodiment, a specific harmonic elimination 5-level RF-PWM modulator includes: a pulse delay control unit, a radio frequency carrier pulse generation unit, first to fourth digital delay line units, first to The second inverter, the first to fourth delay compensation units, and the first to second two-way multiplexers have the first to third three signal input terminals and the first to fourth four signal output terminals in total. , to achieve specific harmonic elimination 5-level RF PWM, and the generated 5-level RF PWM signal S 5LRF_PWM Converted to 3-level RF pulse width modulation signal S with 2 channels of equal pulse area 3LRF_PWM_1 and S 3LRF_PWM_2 , using the digital delay line unit to generate phase-shift control signals for driving the subsequent SMPA unit, so as to achieve power balance between the two SMPAs and between the power tubes in the unit, where:

[0108] The pulse delay control unit includes first to second signal input terminals, f...

Embodiment

[0137] Such as image 3 As shown, according to the pulse rising and falling edges of the output multi-level RF-PWM pulse signal, the specific harmonic elimination multi-level RF-PWM output sequence is decomposed into multiple 3-level RF-PWM pulse sequences with equal pulse areas, To drive the subsequent SMPA unit. The present invention is based on a specific harmonic elimination multi-level RF-PWM method, and outputs an M-level RF-PWM signal S MLRF_PWM , M is any odd number greater than 3, and its normalized maximum level amplitude is U, then the corresponding amplitudes of M levels are -U, ..., -iU / N, ..., -U / N, 0, U / N,...,iU / N,...,U, N=(M-1) / 2, i is any integer between 1 and N, M level RF-PWM signal S MLRF_PWM Contains M-1 pulse rising edges and M-1 pulse falling edges, which are defined as the first pulse rising edge, the second pulse rising edge, ..., the i-th pulse according to the time sequence of pulse rising or falling edges Rising edge, ..., the rising edge of the...

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Abstract

The invention discloses a power equalization method and a modulator for modulation of a specific harmonic elimination multilevel radio frequency pulse width. The method comprises the steps of: decomposing a specific harmonic elimination multi-level RF-PWM signal into a plurality of 3-level RF-PWM signals with equal pulse areas by using the area equivalence principle based on a multi-level radio frequency pulse signal output from the specific harmonic elimination multi-level RF-PWM, according to the rise and fall of the pulse outputting the multi-level RF-PWM signal; driving a rear-stage SMPA unit, so that multi-level RF-PWM output pulse sequence specific harmonics are eliminated, while achieving the power equalization between the rear-stage SMPA units and between the power tubes in the unit. The radio frequency pulse width modulator is based on the power equalization method, and generates a phase shift control signal for driving a rear-stage 5-level SMPA unit by using a digital delay line unit, thereby realizing active cancellation of a 3X times specific harmonic. The power equalization method for modulation of a specific harmonic elimination multilevel radio frequency pulse widthdoes not need an additional power equalization control circuit, which simplifies the modulator structure.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a specific harmonic elimination multilevel radio frequency pulse width modulation power equalization method and modulator. 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 direction of the transmitter. In recent years, the high-efficiency, wide-band digital transmitter (DTx) technology combined with direct digital radio frequency modulation (DDRFM), switched mode power amplifier (SMPA) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/04H03K7/08
CPCH03K7/08H04B1/04H04B2001/0416
Inventor 周强朱蕾张江魏志虎何攀峰陈剑斌
Owner NAT UNIV OF DEFENSE TECH
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