Radio frequency pulse width modulator based on digital delay line units, and modulation unit

A technology of digital delay line and pulse width modulator, applied in electrical components, transmission systems, etc., can solve problems such as difficulty in circuit design and complexity

Active Publication Date: 2019-04-19
NAT UNIV OF DEFENSE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing 5-level RF-PWM signal has 3 harmonics and its integer multiples of odd harmonics. If the design requirements of the tuned f

Method used

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  • Radio frequency pulse width modulator based on digital delay line units, and modulation unit
  • Radio frequency pulse width modulator based on digital delay line units, and modulation unit
  • Radio frequency pulse width modulator based on digital delay line units, and modulation unit

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Embodiment

[0082] Such as figure 1 As shown, the present invention is based on the 5-level radio frequency pulse width modulator of the digital delay line unit, including: including the pulse delay control unit 1, the radio frequency carrier pulse generation unit 2, the first to the fourth digital delay line units 31~ 34. The first two-way multiplexer 41 and the second two-way multiplexer 42 have first to third signal input terminals and first to fourth signal output terminals for generating 5-level radio frequency pulse width modulation signals S 5LRF-PWM ,in:

[0083] The pulse delay control unit 1 includes a first signal input terminal, a second signal input terminal, fifth to eighth signal output terminals and a first control signal output terminal; wherein the first signal input terminal and the second signal input terminal , used to receive the baseband modulated I and Q signals respectively, calculate the pulse delay data according to the specific 5-level radio frequency pulse m...

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Abstract

The invention discloses a radio frequency pulse width modulator based on digital delay line units, and a modulation unit. The modulator comprises a pulse delay control unit, a radio frequency carrierpulse production unit, the first to the fourth digital delay line units, and the first to the second two-channel multiplexers; the modulation method is as follows: the pulse delay control unit in theradio frequency pulse width modulator adopts a five-level radio frequency pulse modulation method, specifically a 3X sub-harmonic cancellation five-level radio frequency pulse modulation method, wherein X is any odd greater than zero, namely, decomposing five level radio frequency pulses needing to output into weighted stacking of two three-level radio frequency sub-pulses, and controlling the pulse widths of two three-level radio frequency sub-pulses, thereby enabling the 3X sub-harmonic amplitude to be zero after performing weighted stacking on two three-level radio frequency sub-pulses. Theactive cancellation and effective inhibition on the 3X sub-harmonic of the five-level radio frequency pulse modulation signal are realized, the cost and the volume of the filter are reduced, and thecomprehensive performance of the wide-frequency band full-digital sender is improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a radio frequency pulse width modulator and a modulation method based on a digital delay line unit. 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) and tuned filter has de...

Claims

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Application Information

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IPC IPC(8): H04B14/02
CPCH04B14/026
Inventor 周强姚富强朱蕾魏志虎张江陈剑斌
Owner NAT UNIV OF DEFENSE TECH
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