CN108062142A - A kind of distortion source structure using direct digital frequency synthesis technology - Google Patents
A kind of distortion source structure using direct digital frequency synthesis technology Download PDFInfo
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- CN108062142A CN108062142A CN201711331037.2A CN201711331037A CN108062142A CN 108062142 A CN108062142 A CN 108062142A CN 201711331037 A CN201711331037 A CN 201711331037A CN 108062142 A CN108062142 A CN 108062142A
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- analog signal
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/02—Digital function generators
- G06F1/03—Digital function generators working, at least partly, by table look-up
- G06F1/0321—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers
- G06F1/0328—Waveform generators, i.e. devices for generating periodical functions of time, e.g. direct digital synthesizers in which the phase increment is adjustable, e.g. by using an adder-accumulator
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- General Engineering & Computer Science (AREA)
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Abstract
A kind of distortion source structure using direct digital frequency synthesis technology of the invention, it includes FPGA control circuit（1）, FPGA control circuit（1）The first output terminal of digital signal be connected with the control terminal of fundamental signal generation circuit；FPGA control circuit（1）Digital signal second output terminal be connected with the control terminal of harmonic signal generation circuit；With reference to crystal oscillator（2）Output terminal and power splitter（6）Input terminal connects；Power splitter（6）First output terminal is connected with the input end of analog signal of fundamental signal generation circuit；Power splitter（6）Second output terminal is connected with the input end of analog signal of harmonic signal generation circuit；The analog signal output and adder of fundamental signal generation circuit（5）First input end of analog signal connects；The analog signal output and adder of harmonic signal generation circuit（5）Second input end of analog signal connects；Adder（5）Output terminal exports distorted signal；The present invention can improve distortion sources integrated level, reduce circuit volume, realize programmable frequency output, improve the distortion factor index of distortion sources.
Description
Technical field
The invention belongs to distortion source technology more particularly to a kind of distortion sources knots using direct digital frequency synthesis technology
Structure.
Background technology
Standard distortion source is for measuring or examining and determine the equipment such as radio communication, sound equipment, electric system and radio and television
A kind of important equipment.Wherein the distortion factor is the core index in standard distortion source.Distortion sources design at present is mainly patrolled using programmable
The modes such as device+DA, RC vibration+filtering are collected to realize.
The digitized wave forms of distorted signal are mainly realized simulation output by programmable logic device+DA modes by DA.This
Although kind mode reduces circuit volume, realize PLC technology, but shortcoming is to be subject to the limited digit of logical device to limit
System, can not obtain low distortion signal.
The mode of RC vibrations+filtering changes its resistance using relay, capacitance realizes that different frequency, range signal are cut
It changes, then distorted signal is generated by superimposer.Although this scheme realizes the generation of low distortion signal, but volume is larger,
Frequency of oscillation limited amount, oscillator frequency is easily affected by environment etc., can not meet multi-frequency dot system testing requirement.
The content of the invention：
The technical problem to be solved in the present invention：A kind of distortion source structure using direct digital frequency synthesis technology is provided, with solution
Certainly the limited digit existing for the distortion sources of the prior art be subject to logical device is limited, although can not obtain low distortion signal or
The generation of low distortion signal is realized, but volume is larger, frequency of oscillation limited amount, and oscillator frequency is easily affected by environment
Deng the technical problems such as multi-frequency dot system testing requirement can not be met.
Technical solution of the present invention：
A kind of distortion source structure using direct digital frequency synthesis technology, it includes FPGA control circuit, FPGA control circuit
The first output terminal of digital signal be connected with the control terminal of fundamental signal generation circuit；The digital signal second of FPGA control circuit
Output terminal is connected with the control terminal of harmonic signal generation circuit；It is connected with reference to crystal oscillator output terminal with power splitter input terminal；Power splitter
First output terminal is connected with the input end of analog signal of fundamental signal generation circuit；Power splitter second output terminal is produced with harmonic signal
The input end of analog signal connection of raw circuit；The analog signal output of fundamental signal generation circuit is believed with the simulation of adder first
The connection of number input terminal；The analog signal output of harmonic signal generation circuit is connected with the second input end of analog signal of adder；
Adder output exports distorted signal.
The fundamental signal generation circuit includes Direct Digital Frequency Synthesizers a, the simulation of Direct Digital Frequency Synthesizers a
Signal input part is connected with the first output terminal of power splitter；The control terminal of Direct Digital Frequency Synthesizers a and FPGA control circuit
The first output terminal of digital signal connects；The analog signal output of Direct Digital Frequency Synthesizers a is believed with operational amplifier a simulations
The connection of number input terminal；Operational amplifier a analog signal outputs are connected with the first input end of analog signal of adder.
Harmonic signal generation circuit includes Direct Digital Frequency Synthesizers b, the analog signal of Direct Digital Frequency Synthesizers b
Input terminal is connected with power splitter second output terminal；The control terminal of Direct Digital Frequency Synthesizers b and the number of FPGA control circuit
Signal second output terminal connects；The analog signal output of Direct Digital Frequency Synthesizers b and operational amplifier b analog signals are defeated
Enter end connection；Operational amplifier b analog signal outputs are connected with digital regulation resistance input end of analog signal, digital regulation resistance mould
Intend signal output part output terminal to be connected with the second input end of analog signal of adder.
Beneficial effects of the present invention：
The present invention proposes a kind of distortion source structure using direct digital frequency synthesis technology, is closed using two Direct Digital frequencies
It grows up to be a useful person and generates fundamental signal and harmonic signal respectively；The amplitude that harmonic signal is realized using digital regulation resistance is controlled；By adding
Musical instruments used in a Buddhist or Taoist mass realizes fundamental wave and harmonic signal synthesis；The present invention can improve distortion sources integrated level, reduce circuit volume, realize that frequency can be compiled
Journey exports, and improves the distortion factor index of distortion sources；It solves and is subject to the limited of logical device existing for the distortion sources of the prior art
Digit limits, although can not obtain low distortion signal or realize the generation of low distortion signal, volume is larger, oscillation frequency
Rate limited amount, oscillator frequency is easily affected by environment etc., can not meet the technical problems such as multi-frequency dot system testing requirement.
Description of the drawings：
Fig. 1 is the structure diagram of the present invention.
Specific embodiment
A kind of distortion source structure using direct digital frequency synthesis technology, it includes FPGA control circuit 1, FPGA controls
The first output terminal of digital signal of circuit 1 is connected with the control terminal of fundamental signal generation circuit；The number letter of FPGA control circuit 1
Number second output terminal is connected with the control terminal of harmonic signal generation circuit；Connect with reference to 2 output terminal of crystal oscillator and 6 input terminal of power splitter
It connects；6 first output terminal of power splitter is connected with the input end of analog signal of fundamental signal generation circuit；6 second output terminal of power splitter
It is connected with the input end of analog signal of harmonic signal generation circuit；The analog signal output and addition of fundamental signal generation circuit
5 first input end of analog signal of device connects；The analog signal output of harmonic signal generation circuit is believed with the simulation of adder 5 second
The connection of number input terminal；5 output terminal of adder exports distorted signal.
The fundamental signal generation circuit includes Direct Digital Frequency Synthesizers a3, the mould of Direct Digital Frequency Synthesizers a3
Intend signal input part to be connected with 6 first output terminal of power splitter；The control terminal of Direct Digital Frequency Synthesizers a3 and FPGA control electricity
The first output terminal of digital signal connection on road 1；The analog signal output and operational amplifier of Direct Digital Frequency Synthesizers a3
A4 input end of analog signal connects；Operational amplifier a4 analog signal outputs connect with 5 first input end of analog signal of adder
It connects.
Harmonic signal generation circuit includes Direct Digital Frequency Synthesizers b7, and the simulation of Direct Digital Frequency Synthesizers b7 is believed
Number input terminal is connected with 6 second output terminal of power splitter；The control terminal of Direct Digital Frequency Synthesizers b7 and FPGA control circuit 1
Digital signal second output terminal connects；The analog signal output of Direct Digital Frequency Synthesizers b7 is simulated with operational amplifier b8
Signal input part connects；Operational amplifier b8 analog signal outputs are connected with 9 input end of analog signal of digital regulation resistance, number
9 analog signal output output terminal of potentiometer is connected with 5 second input end of analog signal of adder.
The present invention can according to the frequency point of required output, can by FPGA control circuit 1 for Direct Digital Frequency Synthesizers a and
Direct Digital Frequency Synthesizers b sets corresponding output frequency；Phase is set for digital regulation resistance 9 by FPGA control circuit 1 simultaneously
The intrinsic standoff ratio answered exports the harmonic signal of different amplitudes；Last fundamental signal synthesizes distortion with harmonic signal by adder to be believed
Number output.
The fpga chip EP3C120F48417 that FPGA control circuit of the embodiment of the present invention is mainly produced using altera,
FPGA configuration chips EPCS64SI16N.With reference to crystal oscillator using the ZPB-26-24MHz quartz oscillators of Beijing morning brilliant production.
Direct Digital Frequency Synthesizers a and Direct Digital Frequency Synthesizers b uses the AD9958BCPZ of ADI productions.Operational amplifier a
, operational amplifier b and adder use the OPA211AIDGKT of TI companies production.Power splitter is produced using Mini-Circuits
ADP-2-1+.Digital regulation resistance uses the AD5144BRUZ10 of ADI productions.
Claims (3)
1. a kind of distortion source structure using direct digital frequency synthesis technology, it includes FPGA control circuit（1）, feature exists
In：FPGA control circuit（1）The first output terminal of digital signal be connected with the control terminal of fundamental signal generation circuit；FPGA is controlled
Circuit（1）Digital signal second output terminal be connected with the control terminal of harmonic signal generation circuit；With reference to crystal oscillator（2）Output terminal with
Power splitter（6）Input terminal connects；Power splitter（6）The input end of analog signal of first output terminal and fundamental signal generation circuit connects
It connects；Power splitter（6）Second output terminal is connected with the input end of analog signal of harmonic signal generation circuit；Fundamental signal generation circuit
Analog signal output and adder（5）First input end of analog signal connects；The analog signal of harmonic signal generation circuit
Output terminal and adder（5）Second input end of analog signal connects；Adder（5）Output terminal exports distorted signal.
2. a kind of distortion source structure using direct digital frequency synthesis technology according to claim 1, it is characterised in that：
The fundamental signal generation circuit includes Direct Digital Frequency Synthesizers a（3）, Direct Digital Frequency Synthesizers a（3）Simulation letter
Number input terminal and power splitter（6）First output terminal connects；Direct Digital Frequency Synthesizers a（3）Control terminal and FPGA control electricity
Road（1）The first output terminal of digital signal connection；Direct Digital Frequency Synthesizers a（3）Analog signal output put with computing
Big device a（4）Input end of analog signal connects；Operational amplifier a（4）Analog signal output and adder（5）First simulation letter
The connection of number input terminal.
3. a kind of distortion source structure using direct digital frequency synthesis technology according to claim 1, it is characterised in that：
Harmonic signal generation circuit includes Direct Digital Frequency Synthesizers b（7）, Direct Digital Frequency Synthesizers b（7）Analog signal it is defeated
Enter end and power splitter（6）Second output terminal connects；Direct Digital Frequency Synthesizers b（7）Control terminal and FPGA control circuit（1）
Digital signal second output terminal connection；Direct Digital Frequency Synthesizers b（7）Analog signal output and operational amplifier b
（8）Input end of analog signal connects；Operational amplifier b（8）Analog signal output and digital regulation resistance（9）Analog signal inputs
End connection, digital regulation resistance（9）Analog signal output output terminal and adder（5）Second input end of analog signal connects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711331037.2A CN108062142A (en) | 2017-12-13 | 2017-12-13 | A kind of distortion source structure using direct digital frequency synthesis technology |
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| CN201711331037.2A CN108062142A (en) | 2017-12-13 | 2017-12-13 | A kind of distortion source structure using direct digital frequency synthesis technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111505376A (en) * | 2020-04-29 | 2020-08-07 | 西安微电子技术研究所 | Device and method for generating standard nonlinear distortion degree |
| CN112653426A (en) * | 2020-12-21 | 2021-04-13 | 贵州航天计量测试技术研究所 | Broadband extremely-narrow pulse signal generating circuit |
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| CN111505376A (en) * | 2020-04-29 | 2020-08-07 | 西安微电子技术研究所 | Device and method for generating standard nonlinear distortion degree |
| CN112653426A (en) * | 2020-12-21 | 2021-04-13 | 贵州航天计量测试技术研究所 | Broadband extremely-narrow pulse signal generating circuit |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180522 |
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| RJ01 | Rejection of invention patent application after publication |