CN208188627U - One kind being based on monolithic processor controlled high-resolution signal source - Google Patents
One kind being based on monolithic processor controlled high-resolution signal source Download PDFInfo
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- CN208188627U CN208188627U CN201820791602.7U CN201820791602U CN208188627U CN 208188627 U CN208188627 U CN 208188627U CN 201820791602 U CN201820791602 U CN 201820791602U CN 208188627 U CN208188627 U CN 208188627U
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Abstract
The utility model relates to one kind to be based on monolithic processor controlled high-resolution signal source, including SCM system, DDS chip circuit, instrument amplifier circuit, the positive follower circuit of voltage, voltage negative follower circuit, program-controlled manual switch and LDO linear power supply；The SCM system connection DDS chip circuit and program-controlled manual switch, DDS chip circuit connect instrument amplifier circuit, and instrument amplifier circuit connects the positive follower circuit of voltage；The instrument amplifier circuit connection program control/manual switch, program control/manual switch connection voltage negative follower circuit；The positive follower circuit of the voltage and voltage negative follower circuit is external single-ended or differential signal output.The signal source output frequency resolution ratio of the utility model is high, and 32 bit frequencies control word register may make output frequency resolution ratio to reach thousand-island forest park；The signal source output voltage noise of the utility model is small, and for the included DAC converter theory in inside up to 0.6mv voltage output precision, LDO linear power supply ripple surveys 10mv.
Description
Technical field
The utility model belongs to electronic circuit technology field, and in particular to one kind is believed based on monolithic processor controlled high-resolution
Number source.
Background technique
Since classical signal source mainly uses the methods of RC oscillation, LC oscillation, difference frequency generation, frequency synthesis, RC oscillation and
LC oscillation due to discrete device capacitor, resistance it is non-linear, signal source resolution ratio is poor.Difference frequency generation is using variable frequency
Oscillator generates variable high frequency f1 and fixed variable oscillator generates fixed high frequency f2, and mixing principle is recycled to realize output
Frequency is f1-f2, since internal oscillator is too many, every level-one and every level-one interferes with each other, discrete device leads to signal source too much
Resolution ratio is also poor.Due to above, classical signal source resolution ratio can not be made high.Can no longer meet communication,
The fields such as observing and controlling, navigation, radar are to signal source resolution ratio increasingly higher demands.
Summary of the invention
The purpose of the utility model is to provide one kind to be based on monolithic processor controlled high-resolution signal source, solves the prior art
The not high technical problem of resolution ratio existing for middle signal source.
The utility model the technical scheme adopted is that
One kind being based on monolithic processor controlled high-resolution signal source, including SCM system, DDS chip circuit, instrument are put
Big device circuit, the positive follower circuit of voltage, voltage negative follower circuit, program-controlled manual switch and LDO linear power supply；The monolithic
Machine system connects DDS chip circuit and program control/manual switch, and DDS chip circuit connects instrument amplifier circuit, instrument amplifier
The positive follower circuit of circuit connection voltage；The instrument amplifier circuit connects program-controlled manual switch, program-controlled manual switch connection
Voltage negative follower circuit；The positive follower circuit of the voltage and voltage negative follower circuit is external single-ended or differential signal is defeated
Out.
Further, the SCM system includes AT89S52-24AU chip, DDS chip in the DDS chip circuit
Model AD9952YSVZ, the instrument amplifier circuit selects AD8220ARMZ.
Compared with prior art, the beneficial effects of the utility model are as follows:
1, the signal source output frequency resolution ratio of the utility model is high, and 32 bit frequencies control word register may make output frequency
Rate resolution ratio reaches thousand-island forest park.
2, the signal source output voltage noise of the utility model is small, and the included DAC converter theory in inside is up to 0.6mv voltage
Output accuracy, LDO linear power supply ripple survey 10mv.
Detailed description of the invention
Fig. 1 is the principles of the present invention schematic block diagram；
Fig. 2 is the circuit diagram of the utility model；
Wherein, Fig. 2 (a) is the circuit diagram of SCM system, and Fig. 2 (b) is the circuit diagram of DDS chip circuit,
Fig. 2 (c) is the circuit diagram of magnifier, and the circuit diagram of the program-controlled manual switch of Fig. 2 (d), Fig. 2 (e) is voltage
The circuit diagram of positive follower circuit, Fig. 2 (f) are the circuit diagram of voltage negative follower circuit.
Specific embodiment
The utility model is described in further detail below by specific embodiment combination attached drawing.It is wherein different to implement
Similar component uses associated similar element numbers in mode.In the following embodiments, many datail descriptions are
In order to enable the application can be better understood.However, those skilled in the art can recognize without lifting an eyebrow, it is part of
Feature is dispensed in varied situations, or can be substituted by other elements, material, method.In some cases,
The relevant some operations of the application are there is no display in the description or describe, this is the core in order to avoid the application
It is flooded by excessive description, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary,
They can completely understand relevant operation according to the general technology knowledge of description and this field in specification.
Referring to Fig. 1, the utility model relates to one kind to be based on monolithic processor controlled high-resolution signal source, including single-chip microcontroller system
System, DDS chip circuit, instrument amplifier circuit, the positive follower circuit of voltage, voltage negative follower circuit, program-controlled manual switch
With LDO linear power supply；The SCM system connection DDS chip circuit and program-controlled manual switch, DDS chip circuit connect instrument
Amplifier circuit, instrument amplifier circuit connect the positive follower circuit of voltage；The instrument amplifier circuit connects program control/manual
Switch, program control/manual switch connection voltage negative follower circuit；The positive follower circuit of the voltage and voltage negative follower circuit
The output of external single-ended or differential signal.
Fig. 2 is the circuit diagram of the utility model；Referring to fig. 2 (a), the single-chip microcontroller of SCM system selects ATMEL public
The AT89S52-24AU chip of department, the chip have 8K in-system programmable components flash, can meet driver size requirements.It is upper
The real-time configuration to single-chip microcontroller can be achieved in the generic asynchronous serial mouth that machine is carried by single-chip microcontroller.
Referring to fig. 2 (b), DDS chip circuit DDS chip select ADI(analog device) company AD9952YSVZ, the core
There are 32 bit frequency control words and 14 DAC inside piece, change the value that output frequency is adjusted in frequency control word, 32 bit frequency controls
Word processed can by output signal a cycle phase 360 degree be divided into 4294967296 equal portions.Determine the resolution of output frequency
Rate is high, up to thousand-island forest park.The included 14 DAC digit mode converters in inside can reach 0.6mv for this system
Voltage output precision.
Referring to fig. 2 (c), magnifier selects AD8220ARMZ, and common-mode rejection ratio is high, low linearity error 0.01%, low
Zao Sheng≤10nV/HZ.Amplification factor can be adjusted by the resistance value of connecting resistance outside 2 feet and 3 feet.
(e) and Fig. 2 (f) referring to fig. 2, voltage follower are selected the LT1206 operational amplifier of LT company to build, are just followed
It is followed with negative, rail-to-rail output ,+15V and -15V power, maximum output current 1.2A, and carrying load ability is strong.
The P0 mouth of AT89S52 single board computer is connected with the 31-41 pin of DDS chip circuit, and it is total that single-chip microcontroller P0 mouth mold intends SPI
Line realizes the internal register configuration and the setting of working condition to programmable digital frequency synthesizer.
20,21 pins of DDS chip circuit and 1 foot of magnifier and 4 feet are respectively connected with, while DDS chip electricity
20,21 pins on road pass through 0.1% accuracy resistance 100R respectively and are pulled upward to 1.8V, realize that electric current is converted to voltage.0.1% resistance is real
Show that electric current can achieve thousand-island forest park into voltage conversion process and DDS initial signal is consistent substantially.DDS core
The external 10K-0.1% resistance of 24 feet of piece circuit is external to GND and adjusts output size of current, equally uses one thousandth resistance.
The indirect 5K-0.1% resistance of 2 feet and 3 feet of instrument amplifier realizes that signal level amplifies 20 times, and output amplitude is adjustable
Range is wide.The output pin of magnifier is connected with 3 feet of the positive follower circuit of voltage, realizes that the power of signal source is put
Greatly.Referring to fig. 2 (d), 7 output pins of magnifier are connected with 2 feet of program-controlled manual switch, and the 3 of program-controlled manual switch
Foot is connected with 2 feet of voltage negative follower circuit, by being turned off manually/turning on the switch the control negative follower of signal source output voltage
The close/open of circuit.1 foot of program-controlled manual switch is connected with the P1.1 pin of AT89S52 single board computer 1, realizes that program is automatic
The close/open of control switch.To realize single-ended/difference output of signal source by manual/auto mode, greatly increase
System has used flexibility and ability resistant to common code interference.
LDO linear power supply is all made of LM1117 power supply chip, compared to Switching Power Supply, has lower voltage ripple, real
Power supply noise is surveyed in 10mv or so, it is ensured that the noise in circuit on ground wire minimizes the interference to signal source output.It is whole
There are 75% allowances for a system power supply power.
The outstanding advantages of the circuit are that (1) signal source output frequency resolution ratio is high, and 32 bit frequencies control word register can make
It obtains output frequency resolution ratio and reaches thousand-island forest park.(2) signal source output voltage noise is small, the included DAC converter reason in inside
By up to 0.6mv voltage output precision, LDO linear power supply ripple surveys 10mv.
The content of the utility model is not limited to cited by embodiment, and those of ordinary skill in the art are practical new by reading this
Type specification and to any equivalent transformation that technical solutions of the utility model are taken, be the claim institute of the utility model
Cover.
Claims (2)
1. one kind is based on monolithic processor controlled high-resolution signal source, it is characterised in that: including SCM system, DDS chip electricity
Road, instrument amplifier circuit, the positive follower circuit of voltage, voltage negative follower circuit, program-controlled manual switch and LDO are linearly electric
Source；The SCM system connection DDS chip circuit and program control/manual switch, DDS chip circuit connect instrument amplifier electricity
Road, instrument amplifier circuit connect the positive follower circuit of voltage；The instrument amplifier circuit connects program-controlled manual switch, program-controlled
Manual switch connects voltage negative follower circuit；The positive follower circuit of the voltage and voltage negative follower circuit it is external single-ended or
Differential signal output.
2. being based on monolithic processor controlled high-resolution signal source according to claim 1, it is characterised in that: the single-chip microcontroller system
System includes AT89S52-24AU chip, and the model AD9952YSVZ of DDS chip, the instrument are put in the DDS chip circuit
Big device circuit selects AD8220ARMZ.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820791602.7U CN208188627U (en) | 2018-05-25 | 2018-05-25 | One kind being based on monolithic processor controlled high-resolution signal source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820791602.7U CN208188627U (en) | 2018-05-25 | 2018-05-25 | One kind being based on monolithic processor controlled high-resolution signal source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208188627U true CN208188627U (en) | 2018-12-04 |
Family
ID=64427575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820791602.7U Active CN208188627U (en) | 2018-05-25 | 2018-05-25 | One kind being based on monolithic processor controlled high-resolution signal source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208188627U (en) |
-
2018
- 2018-05-25 CN CN201820791602.7U patent/CN208188627U/en active Active
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