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

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...

AI Technical Summary

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

Images