Broadband signal generator with nonlinear compensation function
A nonlinear compensation and broadband signal technology, applied in the automatic control of power, electrical components, etc., can solve the problems of signal quality deterioration, sweep speed locking time limit, affecting signal quality, etc., to avoid PLL locking time and linearity Deterioration compensation, effect of improving signal quality
Active Publication Date: 2014-12-24
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology
[0007] (1) Since DDS accumulates phase information, the phase information needs to be truncated during quantization, and its quantized truncation effect on the phase is reflected as spurs on the frequency spectrum, which are difficult to obtain in the subsequent PLL frequency multiplication link eliminate
[0008] (2) Since DDS completes frequency multiplication by pulling PLL, PLL needs a certain amount of time to complete locking when the frequency of the reference signal changes. Therefore, this DDS+PLL architecture is limited by the PLL locking time in terms of sweep speed. This makes its application limited in some occasions that require fast frequency sweep
[0009] (3) Due to the existence of the subsequent frequency doubling system, it is inevitable to deteriorate the quality of the generated signal
Taking the linear frequency modulated signal (Linear Frequency Modulated Continuous Wave, LFMCW) as an example, the subsequent frequency multiplication link will deteriorate the linearity of the generated FLMCW signal, affecting the quality of the signal and the final pulse compression quality of the system
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[0033] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0034] The invention provides a broadband signal generator with nonlinear compensation function, such as figure 2 As shown, it mainly includes digital baseband system and 8-multiplier system;
[0035] The digital baseband system stores the 290-390MHz LFMCW signal after nonlinear distortion compensation, and outputs the 290-390MHz LFMCW signal to the 8-fold frequency system under the control of the external reference clock;
[0036] 8-fold frequency system, used to perform 8-fold frequency processing on the received 290-390MHz LFMCW signal and output it;
[0037] Such as image 3 As shown, the digital baseband system is mainly composed of a high-speed digital-to-analog converter DA (Digital Analog Converter), a programmable logic gate array (Field-Programmable Gate Array, FPGA), a PLL clock source and a filter; its working mode is related to the specific...
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The invention provides a broadband signal generator with a nonlinear compensation function. The broadband signal generator mainly comprises a digital baseband system and an eight-frequency-doubling system. The digital baseband system stores an LFMCW signal of 290 MHz-390 MHz after pre-distortion compensation is performed and outputs the LFMCW signal of 290 MHz-390 MHz to the eight-frequency-doubling system under the control of an external reference clock; the eight-frequency-doubling system performs eight-frequency-doubling processing on the received LFMCW signal of 290 MHz-390 MHz and then outputs an S-band LFMCW signal. The digital baseband system is mainly composed of a high-speed digital analog converter (DAC), a field programmable gate array (FPGA), a PLL clock source and a filter. The FPGA comprises a multi-clock generating module, a central control module, a plurality of read-only memories (ROMs), a parallel-to-serial conversion module and a single-ended differential conversion module.
Description
technical field [0001] The invention belongs to the technical field of frequency synthesis, and in particular relates to a broadband signal generator with nonlinear compensation function. Background technique [0002] Frequency synthesizers are an essential part of modern electronic systems. In communication, radar and navigation equipment, the frequency synthesizer is not only the excitation signal source of the transmitter, but also the local oscillator of the receiver; in the electronic countermeasure equipment, it can be used as a jamming signal generator; in the test equipment, it can be As a standard signal source, the frequency synthesizer is called the "heart" of many electronic systems. [0003] In the field of frequency synthesis, commonly used frequency synthesis methods mainly include phase-locked loop (Phase Locked Loop, PLL) frequency synthesis technology, direct digital frequency synthesis (Direct Digital Synthesizer, DDS), direct digital waveform synthesis t...
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IPC IPC(8): H03L7/18
Inventor李超卢铮方广有
OwnerINST OF ELECTRONICS CHINESE ACAD OF SCI