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A radio frequency pulse width modulator and modulation method based on digital delay line unit

A digital delay line and pulse width modulator technology, applied in electrical components, transmission systems, etc., can solve problems such as difficulty in circuit design and complexity, achieve excellent 3X harmonic suppression performance, reduce implementation difficulty, and improve comprehensive performance effect

Active Publication Date: 2021-08-03
NAT UNIV OF DEFENSE TECH
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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 filter are to be met, the semiconductor process, the difficulty of implementing the circuit, and the complexity of the design are higher. Require

Method used

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  • A radio frequency pulse width modulator and modulation method based on digital delay line unit
  • A radio frequency pulse width modulator and modulation method based on digital delay line unit
  • A radio frequency pulse width modulator and modulation method based on digital delay line 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 and a modulation method based on a digital delay line unit. The modulator includes a pulse delay control unit, a radio frequency carrier pulse generation unit, first to fourth digital delay line units, and first to second two-way multiplexers. The modulation method is: the pulse delay control unit in the radio frequency pulse width modulator adopts a 5-level radio frequency pulse modulation method, specifically a 3X harmonic elimination 5-level radio frequency pulse modulation method, wherein X is any odd number greater than zero, The 5-level RF pulse to be output is decomposed into weighted superposition of two 3-level RF sub-pulses, and by controlling the pulse width of the two 3-level RF sub-pulses, the weighted superposition of the two 3-level RF sub-pulses The amplitude of the 3X harmonic is zero. The invention realizes the active elimination and effective suppression of the 3X harmonic of the 5-level radio frequency pulse width modulation signal, reduces the cost and volume of the filter, and improves the comprehensive performance of the wide-band all-digital transmitter.

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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Patent Type & Authority Patents(China)
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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