CN209659254U - A kind of numerical control attenuation circuit - Google Patents
A kind of numerical control attenuation circuit Download PDFInfo
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- CN209659254U CN209659254U CN201920671631.4U CN201920671631U CN209659254U CN 209659254 U CN209659254 U CN 209659254U CN 201920671631 U CN201920671631 U CN 201920671631U CN 209659254 U CN209659254 U CN 209659254U
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Abstract
The utility model is a kind of numerical control attenuation circuit.The main attenuator circuit of this numerical control attenuation circuit is concatenated first, second master fader, there are also the first and second decaying trimming circuits for including multiple triodes and resistance, the base stage of each triode is connect through resistance with decoding control circuit, the analog signal output of the fine-tuned resistance connection first or second master fader of collector.It selects that semifixed resistor is suitble to finely tune the pad value of circuit, improves the precision of decaying stepping.The output of main attenuator circuit terminates vector network analyzer, first disconnects decaying trimming circuit, detects attenuation, the attenuated error of winner's attenuator circuit at this time, is calculated as the semifixed resistor value of decaying trimming circuit needed for supplementing this error.The utility model improves the stepping attenuation accuracy of the attenuator of 2 pieces of chips concatenation, reaches 0.2dB.And the composite design of dual chip and decaying trimming circuit network, it is easy to accomplish, it can easily be accommodated.
Description
Technical field
The utility model relates to the amplitude adjusted technology of analog signal, specially a kind of numerical control attenuation circuit.
Background technique
The original existing signal of nature is all analog signal, such as sound, image, brightness, radio wave, these simulations
Signal radio subscriber using when largely need to change its amplitude.Low, analog intermediate frequency signal amplitude control field, it is common
Application includes short wave radio signals, radar intermediate frequency signal and other low, Mid Frequency analog signals.These signals exist
Using when be required to the adjusting of carry out amplitude size, meet the signaling interface requirement of circuit thereafter.
The amplitude adjusted of analog signal is broadly divided into mechanical adjustment and electrical adjustment two ways.Mechanical adjustment mode is logical
Mechanical force is crossed on variable resistance, changing variable resistance, intrinsic standoff ratio realizes that signal amplitude changes in circuit, such as
The volume knob for rotating radio-tape recorder changes output musical sound size.Electrical adjustment mode is using in electric signal control circuit
Electronic component parameter change signal amplitude size.Electrical adjustment mode is divided into analog control mode and digital control approach again.Mould
The control signal of quasi- control mode is analog electrical signal, and analog electrical signal voltage is consecutive variations, the decaying of analog attenuator
Value is also consecutive variations.Digital control scheme is then to utilize " 0 " and " 1 " two kinds of digital level control attenuator attenuations, attenuation
Be it is discrete discontinuous, digital control scheme provides great convenience for remote control.
Currently used numerical-control attenuator is classified by control data bits, mainly there is 1~6bit, numerical-control attenuator
The step number that decays is 21~26；Classify by decaying stepping (dB) size, there are commonly 0.125,0.25,0.5,1.0,
2.0,3.0,6.0 etc.；Classify by numerical control attenuation range (dB), there are commonly 0~3,0~6 ... 0~31.5 etc..
There are two main classes for currently marketed numerical-control attenuator device, and one kind is amplitude fading stepping small (0.125dB) essence
High (0.1dB) is spent, but total attenuation range is small；It is another kind of for big (such as 3dB) precision of decaying stepping it is low (0.5dB), but complete attenuation model
It encloses big.
What numerical-control attenuator single-chip devices numerical control amplitude fading range was big currently on the market has 0~-31.5dB, decaying step
Into for 0.25dB (or 0.5dB)；Multi-chip combination product (the decaying chip that two panels attenuation is 0~-31.5dB concatenates) amplitude
For attenuation range up to 0~-63dB, decaying stepping is 0.25dB.Discovery is measured to these products, in 0~-63dB attenuation range
It is interior, do not ensure that each stepping attenuation accuracy reaches 0.25dB.When attenuation is smaller, attenuation accuracy is able to satisfy index and wants
It asks, but attenuation accuracy becomes very poor when attenuation is big, attenuated error maximum reaches 0.6dB, and main cause is the shadows such as circuit noise
It rings.Usual numerical-control attenuator nominal signal input range is 0dBm, and when attenuation is big, (such as -60dB), signal exports after decaying
Amplitude is too small (- 60dBm), and signal is influenced by circuit noise interference and signal cross-talk it is obvious that circuit noise and train of signal
It disturbs and is superimposed upon on the small signal of output, cause output signal accuracy not high, nominal 0.25dB is not achieved in attenuation accuracy difference.Mesh
Before, the 6bit attenuator of 0~-31.5dB of attenuation range, decay stepping 0.5dB, the nominal 0.1dB of attenuation accuracy, surveys only 0.1dB
~0.3dB, amplitude fading is bigger, and attenuation accuracy is poorer.It concatenates to obtain with the numerical-control attenuator of 2 0~-31.5dB attenuation ranges
0~-63dB of attenuation range, decay stepping 0.5dB attenuation module, attenuation accuracy due to second level attenuator error be superimposed,
Surveying attenuation accuracy is only 0.1dB~0.65dB, cannot reach 0.25dB precision in entire attenuation range (0~-63dB) and want
It asks, is difficult to meet required precision the chip of 0.1dB is nominally reached even if using attenuation accuracy.In order to improve attenuation accuracy, need
In addition increase decaying trimming circuit to be modified the attenuator circuit.
Mainly using short wavelength emissions, reception electric signal as the analogue signal amplitude numerical control attenuation technical applications of object,
It is required that amplitude fading numerical control range is 0~-62dB, stepping 1dB, stepping accuracy 0.2dB.Existing numerical-control attenuator chip is full
While sufficient significantly attenuation range, it is unable to satisfy attenuation accuracy index.General numerical-control attenuator carries out input signal
Since many factors such as circuit noise influence when big numerical reduction, cause the small Signal-to-Noise of the output after decaying low, decays
Error increases, and is not able to satisfy requirement of the current technology development to attenuation accuracy.
Utility model content
The purpose of this utility model is to design a kind of numerical control attenuation circuit, including main attenuator circuit and decoding control circuit,
Additionally include decaying trimming circuit.Main attenuator circuit is concatenated first master fader and the second master fader, first and the
Two decaying trimming circuits respectively include 5 triodes and 10 resistance.The base stage (B) of each triode is through 1 resistance and encoded control
Circuit corresponding control signal output connection, collector (C) connect the first master fader or the through a semifixed resistor respectively
The analog signal output of two master faders.The resistance value of the semifixed resistor of the suitable each triode concatenation of selection, declines to this numerical control
The pad value on powered down road is finely adjusted, and improves the decaying essence of each decaying stepping of this numerical control attenuation circuit in attenuation range
Degree.
A kind of numerical control attenuation circuit of the utility model design includes main attenuator circuit and decoding control circuit, and the master declines
Powered down road includes the first master fader and the second master fader.First master fader and the second master fader are identical attenuator
Chip includes digit-control resistance device network, has 5 numeric data code input ports, the resistance value of digit-control resistance device network is by numeric data code
Control, the resistance value determine that the external analog signal of input passes through the attenuation amplitude of master fader.
External analog signal inputs the input end of analog signal of the first master fader, and the analog signal of the first master fader is defeated
Outlet connect the input end of analog signal of the second master fader, the second master fader through the first isolation capacitance with the second isolation capacitance
Analog signal output be this numerical control attenuation circuit output end.
The decoding control circuit is programmable chip, there is 62 system control code input terminals, numeric data code output end point
The numeric data code input terminal of the first, second master fader is not connected.
In the utility model further includes decaying trimming circuit, and the decaying trimming circuit is to decline respectively with the first master
Subtract the first decaying trimming circuit and the second decaying trimming circuit of device and the cooperation of the second master fader.
First and second decaying trimming circuit structures are identical.Each decaying trimming circuit includes 5 triodes and 10 electricity
Resistance.Corresponding with decoding control circuit to control signal defeated through resistance for the base stage (B) of each triode of first decaying trimming circuit
Outlet connection, the collector (C) of each triode concatenate a semifixed resistor respectively, and five semifixed resistors are through the first isolation capacitance
Connect the output end of the first master fader, each transistor emitter (E) ground connection.Each triode of second decaying trimming circuit
The connection of base stage (B) and emitter (E) is identical as first decaying each triode of trimming circuit, the collector (C) of each triode
A semifixed resistor is concatenated respectively, and five semifixed resistors connect the output end of the second master fader through the 4th isolation capacitance.
The decoding control circuit has 4 groups of numeric data code output ends, every group of 5 numeric data code output ends, and each group is separately connected
One master fader, first decaying trimming circuit, the second master fader and second decaying trimming circuit 5 numeric data codes or NC codes
Input terminal.
When the received NC codes of triode (QAA/QBB) of the first, second decaying trimming circuit are " 0 ", triode base
Extremely 0 level, triode cut-off, the AC impedance between collector and emitter are approximately ∞, the fine tuning electricity of collector series connection
Resistance is hanging, and the triode and semifixed resistor do not influence the output valve for the master fader that it is connect.As the numeric data code (QAA/ of triode
QBB) when being " 1 ", transistor base is high level, triode saturation conduction, and the semifixed resistor ground connection of collector series connection, i.e., this is micro-
Adjust resistance in parallel with the load resistance for the master fader that it is connect, the analog signal voltage of master fader output will be by fine tuning electricity
Resistance partial pressure decaying.
The resistance value of the digit-control resistance device network of the received numeric data code control master fader of master fader, determines the outer of input
Portion's analog signal passes through the attenuation amplitude of master fader.But since its performance indicator of different chips can not identical, group
At the technical indicator that obtains of circuit be also impossible to completely the same, add inevitable interference noise and signal cross-talk, it is main
The amplitude fading of attenuator is unable to reach the requirement of stepping accuracy, this i.e. existing attenuator there are the problem of.The utility model
It for the decaying trimming circuit of the first, second master fader configuration, can be debugged according to specific chip and physical circuit, selection is suitable
The resistance value of the semifixed resistor for each triode concatenation closed, is finely adjusted the pad value of this numerical control attenuation circuit, so that this numerical control
The attenuation accuracy of each decaying stepping of the attenuator circuit in attenuation range reaches 0.2dB.
In the first master fader of the utility model and the second master fader the resistance value of digit-control resistance device network and they
The semifixed resistor value of the transistor collector concatenation be connected in first decaying trimming circuit of connection and the second decaying trimming circuit
It determines the load resistance of this numerical control attenuation circuit, also just determines the attenuation amplitude of this numerical control attenuation circuit.According to this numerical control attenuation
The actual conditions of circuit master fader chip are to each triode current collection in the first decaying trimming circuit and the second decaying trimming circuit
The semifixed resistor value of pole concatenation is selected, this numerical control attenuation circuit, which can be realized, declines to the accurate stepping of input analog signal
Subtract.
The control digit 6bit of first, second master fader, amplitude fading 0~-31.5dB of range, decay stepping
0.5dB, chip interior integrates input resistance impedance and output resistance impedance is 50 Ω.
The triode of 2 decaying trimming circuit is high-frequency triode, characteristic frequency fT≥1000MHz。
It is described first, second decaying trimming circuit each triode base stage (B) through the resistance of 8.2k Ω~12k Ω with translate
The corresponding control signal output connection of code control circuit.
When the adjusting of the utility model numerical control attenuation circuit, output end connected vector Network Analyzer, detection output mould
The attenuation of quasi- signal adjusts the resistance value of the semifixed resistor of each transistor collector connection of 2 decaying trimming circuits.First disconnect 2
A decaying trimming circuit inputs different control codes in decoding control circuit respectively, inputs analog signal, vector network analyzer
The analog signal intensity of main attenuator circuit output is detected, and calculates pad value at this time.With the control inputted in decoding control circuit
The difference of attenuation when the corresponding attenuation theoretical value of code and the detection undamped trimming circuit of gained is main attenuator circuit attenuation
Error, calculate semifixed resistor value required for decaying trimming circuit, the semifixed resistor value and main attenuator circuit output resistance
Parallel connection further finely tunes decaying to the analogue signal amplitude exported after master fader decaying.The trimming circuit connection that decays is resulting
Semifixed resistor, and connect with master fader, the analog signal that vector network analyzer detects the output of main attenuator circuit again is strong
Degree, and pad value at this time is calculated, it is micro- to decaying if precision is still greater than 0.2dB compared with attenuation theoretical value corresponding with control code
The semifixed resistor of circuit is adjusted further to adjust, until the attenuation of the analog signal of output attenuation corresponding with the control code is theoretical
The error of value is less than or equal to 0.2dB.
Compared with prior art, the advantages of a kind of numerical control attenuation circuit of the utility model are as follows: 1, configuration decaying trimming circuit,
Attenuation accuracy of the attenuator of 2 pieces of decaying chip concatenation compositions when significantly decaying is improved, this numerical control attenuation circuit is whole
Stepping attenuation accuracy in a attenuation range reduces as far as possible；With existing single-chip, 2 chips attenuator circuit compared with, In
Attenuation accuracy improves 0.3~0.5dB in shortwave frequency range, reaches 0.2dB, and high-fidelity completion declines to the numerical control of analogue signal amplitude
Subtract, meets user's application requirement；2, using the composite design of two pieces of attenuator chips and trimming circuit network of decaying, it is easy to real
It is existing, it can easily be accommodated.
Detailed description of the invention
Fig. 1 is the overall structure diagram of this numerical control attenuation circuit embodiment；
Fig. 2 is the decaying trimming circuit structural schematic diagram of this numerical control attenuation circuit embodiment.
Specific embodiment
The overall structure diagram of this numerical control attenuation circuit embodiment is as shown in Figure 1, include main attenuator circuit, encoded control
Circuit and decaying trimming circuit.Figure inside solid line indicates analog signal, and dotted line line indicates control signal.
The main attenuator circuit of this example includes the first master fader and the second master fader.First master fader and the second main decaying
Device is identical PE4302 attenuator chip, includes digit-control resistance device network, has 5 numeric data code input ports, numerical control
The resistance value of resistor network is controlled by numeric data code, which determines external analog signal the declining by master fader of input
Amount of decrease degree.Each PE4302 attenuator chip controls digit 6bit, amplitude fading 0~-31.5dB of range, decay stepping 0.5dB,
Chip interior integrates input resistance impedance and output resistance impedance is 50 Ω.
External analog signal SinInput the input end of analog signal of the first master fader, the analog signal of the first master fader
Output end is through the first isolation capacitance C1With the second isolation capacitance C2The input end of analog signal of the second master fader is connected, second is main
The analog signal output of attenuator is the output analog signal S of this numerical control attenuation circuit through the output of third isolation capacitanceout。
This example decoding control circuit has 62 system control codes defeated for programmable chip using general FPGA/CPLD chip
Enter end, and there are 4 groups of numeric data code output ends, every group of 5 numeric data code output ends, each group is separately connected the first master fader, and first declines
Subtract trimming circuit, 5 numeric data codes or NC codes input terminal of the second master fader and the second decaying trimming circuit.
The decaying trimming circuit in the utility model be respectively with the first master fader and the second master fader
First decaying trimming circuit of cooperation and the second decaying trimming circuit.
As shown in Fig. 2, the first and second decaying trimming circuit structures are identical.Each decaying trimming circuit includes 5 three poles
Pipe and 10 resistance.The triode is high-frequency triode, characteristic frequency fT≥1000MHz。
The base stage (B) of 5 triodes Q10, Q12, Q14, Q16 and Q18 of first decaying trimming circuit are through 10k Ω resistance
Control signal output connection corresponding with decoding control circuit, receives NC codes QAA0, QAA1, QAA2, QAA3 and QAA4；Respectively
The collector (C) of triode concatenates semifixed resistor R10, R12, R14, R16 and a R18 respectively, and above-mentioned five semifixed resistors are equal
The output end of the first master fader, each transistor emitter (E) ground connection are connected through the first isolation capacitance.Second decaying trimming circuit
5 triodes base stage (B) and emitter (E) connection with first decay each triode of trimming circuit it is similar, triode
The base stage (B) of Q20, Q22, Q24, Q26 and Q28 are through 10k Ω resistance control signal output corresponding with decoding control circuit
Connection receives NC codes QBB0, QBB1, QBB2, QBB3 and QBB4；The collector (C) of each triode concatenates a fine tuning respectively
Resistance R20, R22, R24, R26 and R28, above-mentioned five semifixed resistors are through the 4th isolation capacitance C4 the second master fader of connection
Output end.
When the resulting NC codes of transistor base of the first, second decaying trimming circuit are " 0 ", transistor base 0
Level, triode cut-off, AC impedance is approximately ∞ between collector and emitter, and the semifixed resistor of collector series connection is hanging,
The triode and semifixed resistor do not influence the output valve for the master fader that it is connect.When the NC codes of triode are " 1 ", three poles
Pipe base stage is high level, and triode saturation conduction, the semifixed resistor ground connection of collector series connection, the i.e. semifixed resistor are connect with it
The load resistance of master fader is in parallel, and the analog signal voltage of master fader output will be divided by the semifixed resistor decays.
Above-described embodiment is only further described the purpose of this utility model, technical scheme and beneficial effects
Specific case, the utility model are not limited to this.All any modifications made within the scope of disclosure of the utility model,
Equivalent replacement, improvement etc., are included in the protection scope of the present invention.
Claims (4)
1. a kind of numerical control attenuation circuit, including main attenuator circuit and decoding control circuit, the main attenuator circuit includes first main
Attenuator and the second master fader；First master fader and the second master fader are identical attenuator chip, include numerical control electricity
Device network is hindered, there are 5 numeric data code input ports, the resistance value of digit-control resistance device network is controlled by numeric data code；
External analog signal inputs the input end of analog signal of the first master fader, the analog signal output of the first master fader
The input end of analog signal of the second master fader, the mould of the second master fader are connect with the second isolation capacitance through the first isolation capacitance
Quasi- signal output end is the output end of this numerical control attenuation circuit；
The decoding control circuit is programmable chip, has 62 system control code input terminals, numeric data code output end connects respectively
Connect the numeric data code input terminal of the first, second master fader；
It is characterized by:
It further include decaying trimming circuit；The decaying trimming circuit is to cooperate respectively with the first master fader and the second master fader
First decaying trimming circuit and second decaying trimming circuit；
First and second decaying trimming circuit structures are identical；Each decaying trimming circuit includes 5 triodes and 10 resistance；The
The base stage of each triode of one decaying trimming circuit is connected through resistance control signal output corresponding with decoding control circuit,
The collector of each triode concatenates a semifixed resistor respectively, and five semifixed resistors decline through the first master of the first isolation capacitance connection
Subtract the output end of device, each transistor emitter ground connection；The base stage and emitter of each triode of second decaying trimming circuit
Connection decays with first, and each triode of trimming circuit is identical, and the collector of each triode concatenates a semifixed resistor respectively, and five
A semifixed resistor connects the output end of the second master fader through the 4th isolation capacitance；
The encoded control has 4 groups of numeric data code output ends, every group of 5 numeric data code output ends, and each group is separately connected the first main decaying
Device, first decaying trimming circuit, the second master fader and second decaying trimming circuit 5 numeric data codes or NC codes input terminal；
When first and second decaying trimming circuits the received NC codes of triode be " 0 " when, transistor base be 0 level, three
Pole pipe cut-off；When the numeric data code of triode is " 1 ", transistor base is high level, triode saturation conduction, collector series connection
Semifixed resistor ground connection, i.e., the semifixed resistor is in parallel with the load resistance for the master fader that it is connect, master fader export mould
Quasi- signal voltage will be divided by the semifixed resistor decays.
2. numerical control attenuation circuit according to claim 1, it is characterised in that:
The control digit 6bit of first, second master fader, amplitude fading 0~-31.5dB of range, decay stepping 0.5dB,
Chip interior integrates input resistance impedance and output resistance impedance is 50 Ω.
3. numerical control attenuation circuit according to claim 1, it is characterised in that:
The triode of 2 decaying trimming circuit is high-frequency triode, characteristic frequency fT≥1000MHz。
4. numerical control attenuation circuit according to claim 1, it is characterised in that:
The base stage of each triode of the first, second decaying trimming circuit is through the resistance of 8.2k Ω~12k Ω and encoded control
The corresponding control signal output connection of circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920671631.4U CN209659254U (en) | 2019-05-10 | 2019-05-10 | A kind of numerical control attenuation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920671631.4U CN209659254U (en) | 2019-05-10 | 2019-05-10 | A kind of numerical control attenuation circuit |
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| CN209659254U true CN209659254U (en) | 2019-11-19 |
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| CN201920671631.4U Withdrawn - After Issue CN209659254U (en) | 2019-05-10 | 2019-05-10 | A kind of numerical control attenuation circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995344A (en) * | 2019-05-10 | 2019-07-09 | 中国电子科技集团公司第三十四研究所 | A kind of numerical control attenuation circuit and its adjusting method |
-
2019
- 2019-05-10 CN CN201920671631.4U patent/CN209659254U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995344A (en) * | 2019-05-10 | 2019-07-09 | 中国电子科技集团公司第三十四研究所 | A kind of numerical control attenuation circuit and its adjusting method |
| CN109995344B (en) * | 2019-05-10 | 2024-02-13 | 中国电子科技集团公司第三十四研究所 | Numerical control attenuation circuit and adjusting method thereof |
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