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A frequency sweep signal generator and a method for generating a frequency sweep signal

A frequency sweep signal and generator technology, applied in electrical components and other directions, can solve the problems of reduced frequency sweep accuracy and frequency resolution, low frequency sweep speed, etc., to improve the accuracy and frequency resolution, speed, reduce external the effect of interference

Active Publication Date: 2016-01-20
RIGOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this sweeping signal source and sweeping method for realizing sweeping have to wait until the DDS controller calculates a frequency control word K each time to generate a new frequency, so the sweeping speed is relatively low, and the sweeping The frequency accuracy and frequency resolution will also be reduced

Method used

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  • A frequency sweep signal generator and a method for generating a frequency sweep signal
  • A frequency sweep signal generator and a method for generating a frequency sweep signal
  • A frequency sweep signal generator and a method for generating a frequency sweep signal

Examples

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Effect test

Embodiment 1

[0018] figure 2 It is a schematic structural diagram of a sweeping signal source generator according to an embodiment of the present invention, such as figure 2 As shown, the frequency sweep signal source generator of the embodiment of the present invention includes:

[0019] The parameter command receiving port 101 is used to receive frequency sweep parameters and frequency sweep commands set by users. Wherein, the frequency sweep parameters include: start frequency, stop frequency and sweep time; various parameters for controlling the sweep signal can be calculated according to the start frequency, stop frequency and sweep time.

[0020] The frequency sweep command includes: frequency sweep type and frequency sweep trigger source. Among them, the frequency sweep type includes linear frequency sweep or logarithmic frequency sweep, the user can set the frequency sweep type; the frequency sweep trigger source includes internal trigger, external trigger or manual trigger, on...

Embodiment 2

[0036] image 3 It is a schematic structural diagram of another embodiment of the frequency sweep signal generator of the embodiment of the present invention. As shown in the figure, the frequency sweep signal generator of this embodiment includes not only all the components in Embodiment 1, but also: amplitude control The unit 113 is used to adjust the signal amplitude of the final sweep signal according to the amplitude adjustment parameter. The amplitude of the signal from the low-pass filter 111 may not meet the needs of the user, so it can be controlled by the amplitude control unit. 113 to adjust the signal amplitude.

[0037] Moreover, in this embodiment, the parameter command receiving port 101 and the frequency sweep control parameter generating unit 102 are realized by DSP. Sweep frequency word RAM103, RAM read address generator 104, parameter adjustment unit 105, phase accumulator 106, carrier address accumulator 107, carrier wave table RAM108 and adder 109 are int...

Embodiment 3

[0039] Figure 4 It is a method flowchart of an embodiment of the method for generating a frequency sweep signal of the present invention. As shown in the figure, the implementation method of the frequency sweep signal of this embodiment includes:

[0040] S101. Receive frequency sweep parameters and frequency sweep commands set by the user. The frequency sweep parameters include: start frequency, stop frequency and sweep time; control can be calculated according to start frequency, stop frequency and sweep time Various parameters of the frequency sweep signal.

[0041] The frequency sweep command includes: frequency sweep type and frequency sweep trigger source. Among them, the frequency sweep type includes linear frequency sweep or logarithmic frequency sweep, the user can set the frequency sweep type; the frequency sweep trigger source includes internal trigger, external trigger or manual trigger, once the trigger source arrives, the frequency sweep signal is output once, ...

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Abstract

The invention discloses a sweep signal generator, which comprises a parameter command receiving port, a sweep frequency control parameter generating unit, a sweep frequency control word random access memory (RAM), an RAM read address generator, a parameter regulating unit, a phase accumulator, a carrier address accumulator, a carrier sheet RAM, an adder, an analog-digital converter and a low pass filter. A method of superposing two paths of frequency components is adopted, namely a method for adding a frequency base unit weight part of a sweep signal and a frequency increment part of the sweep signal is utilized to generate the sweep signal, and the accuracy and frequency resolution of the generated sweep signal are greatly improved. The sweep signal generator has the highest accuracy of 1uHz. Moreover, a digital signal processor (DSP), a field programmable gate array (FPGA) and other digital processing modes are adopted, so the characteristics of programmability and high speed are achieved, the DSP, FPGA and the like can be integrated on a printed circuit board (PCB) and are not required to be connected through extra connecting lines, and the external interference can be reduced.

Description

technical field [0001] The invention relates to the field of electronic measurement, in particular to a frequency sweep signal generator and a method for generating a frequency sweep signal. Background technique [0002] Frequency sweep technology is an important technology in electronic measurement, which is widely used in the measurement of frequency characteristics of FM amplifiers, broadband amplifiers, various filters, phase detectors and other active or passive networks. The frequency sweep signal source is one of the key links in the design of the entire measurement system. With the continuous improvement of the measured frequency and accuracy requirements, the sweep signal source designed by the traditional crystal oscillator can no longer meet the requirements. [0003] Direct Digital Frequency Synthesis (DirectDigitalFrequencySynthesis, DDS) is a frequency synthesis technology that directly synthesizes the required waveform from the concept of phase. DDS uses all-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B23/00
Inventor 王悦王铁军李维森
Owner RIGOL
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