CN108306621A - High-frequency low-power consumption true logarithmic amplifier - Google Patents
High-frequency low-power consumption true logarithmic amplifier Download PDFInfo
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- CN108306621A CN108306621A CN201810181516.9A CN201810181516A CN108306621A CN 108306621 A CN108306621 A CN 108306621A CN 201810181516 A CN201810181516 A CN 201810181516A CN 108306621 A CN108306621 A CN 108306621A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/451—Indexing scheme relating to amplifiers the amplifier being a radio frequency amplifier
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G2201/00—Indexing scheme relating to subclass H03G
- H03G2201/10—Gain control characterised by the type of controlled element
- H03G2201/103—Gain control characterised by the type of controlled element being an amplifying element
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G2201/00—Indexing scheme relating to subclass H03G
- H03G2201/10—Gain control characterised by the type of controlled element
- H03G2201/106—Gain control characterised by the type of controlled element being attenuating element
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G2201/00—Indexing scheme relating to subclass H03G
- H03G2201/70—Gain control characterized by the gain control parameter
- H03G2201/702—Gain control characterized by the gain control parameter being frequency, e.g. frequency deviations
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Abstract
The present invention provides a kind of high-frequency low-power consumption true logarithmic amplifier, including：Input signal is divided into two-way and is transferred to attenuator and amplitude limiting amplifier circuit by power divider circuit；Attenuator carries out attenuation processing, to adjust the starting point of logarithmic detector to input signal；Logarithmic detector amplifying circuit carries out detection enhanced processing to the input signal after attenuation processing, to export the vision signal with input signal amplitude at logarithmic relationship；Slew rate adjustment circuit is adjusted the slope of vision signal, and gives the video signal transmission after adjustment to amplitude modulate circuit；Amplitude limiting amplifier circuit carries out limited range enlargement processing to input signal；Match circuit gives limited range enlargement treated input signal matching output to amplitude modulate circuit；Amplitude modulate circuit, according to the changing rule of the vision signal after adjustment, to limited range enlargement, treated that input signal is adjusted into line amplitude, output by logarithmic parabola variation radiofrequency signal.Working frequency of the present invention is high, low in energy consumption, small.
Description
Technical field
The invention belongs to integrated circuit fields, and in particular to a kind of high-frequency low-power consumption true logarithmic amplifier.
Background technology
True logarithmic amplifier is the important devices in reception system, and effect is to believe the Larger Dynamic received in receiving channel
Number smaller signal of boil down to dynamic range, for subsequent conditioning circuit (such as AD analog-to-digital conversions) processing.
Traditional true logarithmic amplifier is passed through by the double gain units (TLA) of several grades using double gain-type circuit structures
Cascade constitutes true logarithmic amplifier, as shown in Figure 1.Double gain units (TLA) are by a high-gain limiting amplifier and a unit
Gain amplifier GL and output stage composition.Traditional true logarithmic amplifier circuit, limited by the structure, frequency is relatively low (at present most
High working frequency 500MHz), power consumption higher (generally higher than 1.5W), volume is larger, debugging is difficult.Therefore, using traditional true
Logafier realization method and structure, when obtaining the big logarithm dynamic range more than 80dB, high, volume that there are quiescent dissipations
Greatly, the difficult problem of debugging.With the development of modern communications technology, the working frequency of AD converter is continuously improved, there is an urgent need to
The working frequency of prime true logarithmic amplifier is improved, while reducing power consumption, reducing volume, to meet complete machine needs.
Invention content
The present invention provides a kind of high-frequency low-power consumption true logarithmic amplifier, to solve current true logarithmic amplifier working frequency
It is low, power consumption is high, bulky problem.
According to a first aspect of the embodiments of the present invention, a kind of high-frequency low-power consumption true logarithmic amplifier is provided, feature exists
In, including：
Power divider circuit is transferred to attenuator and amplitude limiting amplifier circuit for input signal to be divided into two-way；
Attenuator, for carrying out attenuation processing to input signal, to adjust the starting point of logarithmic detector；
Logarithmic detector amplifying circuit, for carrying out detection enhanced processing to the input signal after attenuation processing, with output
With input signal amplitude at the vision signal of logarithmic relationship；
Slew rate adjustment circuit is adjusted for the slope to the vision signal, and the vision signal after adjustment is passed
It is defeated by amplitude modulate circuit；
Amplitude limiting amplifier circuit, for carrying out limited range enlargement processing to input signal；
Match circuit, for giving limited range enlargement treated input signal matching output to amplitude modulate circuit；
Amplitude modulate circuit, for the changing rule according to the vision signal after adjustment, to limited range enlargement, that treated is defeated
Enter signal to adjust into line amplitude, the radiofrequency signal that output is changed by logarithmic parabola；
Amplifier circuit exports true logarithmic amplification signal for being amplified processing to the radiofrequency signal.
In an optional implementation manner, the power divider circuit includes the first capacitance and power splitter, first electricity
For connecting input signal, the other end connects the input terminal of the power splitter, the first output end of the power splitter for one end of appearance
The attenuator is connected, second output terminal connects the amplitude limiting amplifier circuit.
In another optional realization method, the attenuator includes first resistor, second resistance and 3rd resistor,
Described in one end of first resistor be grounded and be used to connect the power divider circuit by second resistance, the other end passes through third electricity
Resistance is grounded and for connecting the logarithmic detector amplifying circuit.
In another optional realization method, the logarithmic detector amplifying circuit includes logarithmic detector amplifier, third
To the 7th resistance and the second to the 9th capacitance, wherein one end of second capacitance connects the attenuator, the other end passes through
4th resistance eutral grounding and by the pin 2 of logarithmic detector amplifier described in the 6th capacitance connection, the logarithmic detector amplifier
Pin 1 and 4 all connects power supply, and pin 1 is separately connected the 7th capacitance and the 8th capacitance of ground connection, and pin 4, which is separately connected, to be connect
4th capacitance on ground and the 5th capacitance, the logarithmic detector amplifier pin 3 connection ground connection third capacitance, pin 5,6,7,
8,10,13,15,16 ground connection, the 9th capacitance of the connection ground connection of pin 14, after pin 11 and 12 short circuits with the slew rate adjustment circuit
Connection, pin 9 connect with one end of the 5th resistance, the 6th resistance and the 7th resistance respectively, the 5th resistance and the 6th resistance it is another
One end is grounded, another termination power of the 7th resistance.
In another optional realization method, the slew rate adjustment circuit includes the 8th to the 14th resistance, the first fortune
Amplifier, second operational amplifier and the first triode are calculated, wherein one end of the 8th resistance connects the logarithmic detector amplification electricity
Road, the other end connect the negative input end of the first operational amplifier and connect first operational amplifier by eleventh resistor
The positive input terminal of output end, first operational amplifier is separately connected one end of the 9th resistance and the tenth resistance, the 9th resistance
Another termination power, the other end ground connection of the tenth resistance, the output end of first operational amplifier connects twelfth resistor
One end, the twelfth resistor the other end connection second operational amplifier negative input end simultaneously connect by thirteenth resistor
Ground, the positive input terminal ground connection of the second operational amplifier, negative input end pass through the 14th resistance eutral grounding, output end connection first
The base stage of triode, the emitter of first triode is by the 14th resistance eutral grounding, and collector is for connecting the amplitude
Modulate circuit.
In another optional realization method, the amplitude limiting amplifier circuit includes the 15th to the 19th resistance, the tenth
To the 18th capacitance and limiting amplifier, one end of the tenth capacitance is by the 15th resistance eutral grounding and for connecting the power splitter
Circuit, the other end connect the pin 2 of limiting amplifier, and the pin 1 and 12 of the limiting amplifier connects power supply, the connection of pin 13 the
The other end of one end of 18 resistance, the 18th resistance is grounded and connects first and interlink of the 17th capacitance and the 18th capacitance
Second sys node of point, the 17th capacitance and the 18th capacitance connects power supply, and the pin 14 of the limiting amplifier passes through parallel connection
The 14th capacitance and the 17th resistance eutral grounding, pin 8,15 and 16 suspends, and pin 3 passes through the 11st capacity earth, 4 He of pin
9 ground connection, pin 5 by parallel the 12nd capacitance and the 16th resistance eutral grounding, pin 6 by the 13rd capacitance connection pin 7,
Pin 10 is by concatenated 16th capacitance and the 19th resistance eutral grounding, and pin 11 is by matching electricity described in the 15th capacitance connection
Road.
In another optional realization method, the match circuit includes the 20th resistance, the 21st resistance and the
One inductance, wherein one end of first inductance is by the 20th resistance eutral grounding and is used to connect the amplitude limiting amplifier circuit, separately
One end is by the 21st resistance eutral grounding and for connecting the amplitude modulate circuit.
In another optional realization method, the amplitude modulate circuit includes the 19th capacitance, the 20th capacitance, the
22 to the 27th resistance, the second triode and third transistor, wherein one end of the 19th capacitance is for connecting
The match circuit, the other end connect the base stage of the second diode, and connect power supply by the 22nd resistance, pass through the 23rd
The collector of resistance eutral grounding, second diode connects power supply, and emitter connects one end of the 24th resistance and connects third
The other end of the emitter of triode, the 24th resistance connects the slew rate adjustment circuit, and the collector of third transistor is used
In exporting the radiofrequency signal and connecing power supply by the 25th resistance, base stage passes through the 27th resistance and the 20th electricity respectively
Hold ground connection, and power supply is connected by the 26th resistance.
In another optional realization method, the amplifier circuit include the 21st capacitance, the 22nd capacitance,
Amplifier, the 28th resistance and the second inductance, wherein one end of the 21st capacitance is used to connect the amplitude modulate circuit,
The other end connects the input terminal of amplifier, and the output end of amplifier passes through concatenated 28th resistance, the second inductance connection electricity
Source, and one end of the 22nd capacitance is connected, the other end of the 22nd capacitance is for exporting the true logarithmic amplification signal.
The beneficial effects of the invention are as follows：
Input signal is divided into two-way by the present invention by power divider circuit, is made wherein all the way by logarithmic detector amplifying circuit
Input signal is transformed into the vision signal at logarithmic relationship with input signal amplitude, is believed according to the video by amplitude modulate circuit
Number changing rule another way input signal is adjusted into line amplitude, believe it is possible thereby to obtain radio frequency change by logarithmic parabola
Number, which obtains true logarithmic amplification signal after amplifier circuit enhanced processing, true logarithmic amplification signal it is entire
Acquisition process is simple, and involved device is less, therefore the present invention's is low in energy consumption, small；The present invention by attenuator and
Slew rate adjustment circuit can correspond to the starting point of adjustment logarithmic detector and the slope of vision signal, so as to another way
The changing rule for the vision signal that input signal amplitude is based on when adjusting is adjusted, and thus the present invention can be to more broadband
The input signal of range carries out true logarithmic amplification, and consistency is preferable, convenient for producing in enormous quantities, in addition, the present invention is very right in increase
While the operating frequency range of number amplifier, the working frequency of true logarithmic amplifier is also improved.
Description of the drawings
Fig. 1 is the circuit diagram of existing true logarithmic amplifier；
Fig. 2 is one embodiment circuit block diagram of high-frequency low-power consumption true logarithmic amplifier of the present invention；
Fig. 3 is the circuit diagram of power divider circuit in Fig. 2；
Fig. 4 is the circuit diagram of attenuator in Fig. 2；
Fig. 5 is the circuit diagram of logarithmic detector amplifying circuit in Fig. 2；
Fig. 6 is the circuit diagram of slew rate adjustment circuit in Fig. 2；
Fig. 7 is the circuit diagram of amplitude limiting amplifier circuit in Fig. 2；
Fig. 8 is the circuit diagram of match circuit in Fig. 2；
Fig. 9 is the circuit diagram of amplitude modulate circuit in Fig. 2；
Figure 10 is the circuit diagram of amplifier circuit in Fig. 2；
Figure 11 is the circuit test results figure of Fig. 2 high frequency low-power consumption true logarithmic amplifiers.
Specific implementation mode
In order to make those skilled in the art more fully understand the technical solution in the embodiment of the present invention, and make of the invention real
The above objects, features, and advantages for applying example can be more obvious and easy to understand, below in conjunction with the accompanying drawings to technical side in the embodiment of the present invention
Case is described in further detail.
In the description of the present invention, unless otherwise specified and limited, it should be noted that term " connection " should do broad sense reason
Solution, for example, it may be mechanical connection or electrical connection, can also be the connection inside two elements, can be directly connected, also may be used
Indirectly connected through an intermediary, for the ordinary skill in the art, can understand as the case may be above-mentioned
The concrete meaning of term.
It is one embodiment circuit block diagram of high-frequency low-power consumption true logarithmic amplifier of the present invention referring to Fig. 2.The high frequency
Rate low-power consumption true logarithmic amplifier may include power divider circuit 1, attenuator 2, logarithmic detector amplifying circuit 3, slope adjustment electricity
Road 4, amplitude limiting amplifier circuit 5, match circuit 6, amplitude modulate circuit 7 and amplifier circuit 8, power divider circuit 1 are defeated for receiving
Enter signal, the first output end connects the input terminal of amplitude limiting amplifier circuit 5, and second output terminal connects the input terminal of attenuator 2, limit
The input terminal of the output end matching connection circuit 6 of width amplifying circuit 5, the output end connection amplitude modulate circuit 7 of match circuit 6
First input end, the input terminal of the output end connection logarithmic detector amplifying circuit 3 of attenuator 2, logarithmic detector amplifying circuit 3 it is defeated
Outlet connects the input terminal of slew rate adjustment circuit 4, and the second of the output end connection amplitude adjusting circuit 7 of slew rate adjustment circuit 4 is defeated
Enter end, the input terminal of the output end connection amplifier circuit 8 of amplitude adjusting circuit 7, the output end of amplifier circuit 8 is for exporting
True logarithmic amplification signal.Wherein, power divider circuit is transferred to attenuator and limited range enlargement electricity for input signal to be divided into two-way
Road；
Attenuator, for carrying out attenuation processing to input signal, to adjust the starting point of logarithmic detector；
Logarithmic detector amplifying circuit, for carrying out detection enhanced processing to the input signal after attenuation processing, with output
With input signal amplitude at the vision signal of logarithmic relationship；
Slew rate adjustment circuit is adjusted for the slope to the vision signal, and the vision signal after adjustment is passed
It is defeated by amplitude modulate circuit；
Amplitude limiting amplifier circuit, for carrying out limited range enlargement processing to input signal；
Match circuit, for giving limited range enlargement treated input signal matching output to amplitude modulate circuit；
Amplitude modulate circuit, for the changing rule according to the vision signal after adjustment, to limited range enlargement, that treated is defeated
Enter signal to adjust into line amplitude, the radiofrequency signal that output is changed by logarithmic parabola；
Amplifier circuit exports true logarithmic amplification signal for being amplified processing to the radiofrequency signal.
Input signal is divided into two-way by the present invention by power divider circuit, is made wherein all the way by logarithmic detector amplifying circuit
Input signal is transformed into the vision signal at logarithmic relationship with input signal amplitude, is believed according to the video by amplitude modulate circuit
Number changing rule another way input signal is adjusted into line amplitude, believe it is possible thereby to obtain radio frequency change by logarithmic parabola
Number, which obtains true logarithmic amplification signal after amplifier circuit enhanced processing, true logarithmic amplification signal it is entire
Acquisition process is simple, and involved device is less, therefore the present invention's is low in energy consumption, small；The present invention by attenuator and
Slew rate adjustment circuit can correspond to the starting point of adjustment logarithmic detector and the slope of vision signal, so as to another way
The changing rule for the vision signal that input signal amplitude is based on when adjusting is adjusted, and thus the present invention can be to more broadband
The input signal of range carries out true logarithmic amplification, and consistency is preferable, convenient for producing in enormous quantities, in addition, the present invention is very right in increase
While the operating frequency range of number amplifier, the working frequency of true logarithmic amplifier is also improved.
In conjunction with shown in Fig. 3, the power divider circuit 1 includes the first capacitance C1 and power splitter IC1, the first capacitance C1's
Input terminal IN1 of the one end as power divider circuit, for connecting input signal, the other end of the first capacitance C1 connects the work(point
The input terminal of device IC1, the first output end OUT1 connections attenuator of the power splitter IC1, second output terminal OUT2 connections
The amplitude limiting amplifier circuit.In the present embodiment, the first capacitance C1 plays the role of blocking, and the first output end OUT1 and second is defeated
Outlet OUT2 is used interchangeably.
In conjunction with shown in Fig. 4, the attenuator 2 is the π type attenuators being made of three resistance comprising first resistor R1,
Second resistance R2 and 3rd resistor R3, wherein one end of the first resistor R1 is grounded by second resistance R2, and as decaying
The input terminal IN2 of device 2, the first output end for connecting the power divider circuit 1, the other end of first resistor R1 pass through third
Resistance R3 ground connection, and for the output end OUT3 as attenuator 2, connect the input terminal of the logarithmic detector amplifying circuit 3.
In conjunction with shown in Fig. 5, the logarithmic detector amplifying circuit 3 includes logarithmic detector amplifier IC2, third to the 7th resistance
R3~R7 and second to the 9th capacitance C2~C7, wherein one end of the second capacitance C2 is as logarithmic detector amplifying circuit 3
Input terminal IN3, connect the output end of the attenuator 2, the other end of the second capacitance C2 is grounded and is led to by the 4th resistance R4
Cross the pin 2 that the 6th capacitance C6 connects the logarithmic detector amplifier IC2, the pin 1 and 4 of the logarithmic detector amplifier IC2
Power supply+5V is all connected, and pin 1 is separately connected the 7th capacitance C7 and the 8th capacitance C8 of ground connection, pin 4 is separately connected ground connection
The 4th capacitance C4 and the 5th capacitance C5, the logarithmic detector amplifier IC2 pin 3 connection ground connection third capacitance C3, pipe
Foot 5,6,7,8,10,13,15,16 is grounded, the 9th capacitance C9 of the connection ground connection of pin 14, and logarithm is used as after pin 11 and 12 short circuits
The output end OUT4 of detector amplifier 3, with the slope adjustment electricity 4 input terminal connect, pin 9 respectively with the 5th resistance
One end of R5, the 6th resistance R6 and the 7th resistance R7 connect, the other end ground connection of the 5th resistance R5 and the 6th resistance R6, the 7th electricity
Hinder another termination power+5V of R7.The present invention can make logarithmic detector by carrying out above-mentioned design to logarithmic detector amplifying circuit
The frequency of amplifier is high, low in energy consumption, input dynamic range is big, small, can be carried out to the input signal after attenuation processing
Detection is amplified step by step.
In conjunction with shown in Fig. 6, the slew rate adjustment circuit 4 includes the 8th resistance to the 14th resistance R8~R14, the first operation
Amplifier IC3, second operational amplifier IC4 and the first triode V1, wherein one end of the 8th resistance R8 adjusts electricity as slope
The input terminal IN4 on road 4, connects the output end of the logarithmic detector amplification electricity 3, and the other end of the 8th resistance R8 connects the first operation
The negative input end of amplifier IC3 and the output end that the first operational amplifier IC3 is connected by eleventh resistor R11, it is described
The positive input terminal of first operational amplifier IC3 is separately connected one end of the 9th resistance R9 and the tenth resistance R10, the 9th resistance R9's
The other end of another termination power+5V, the tenth resistance R10 are grounded, the output end connection the tenth of the first operational amplifier IC3
One end of two resistance R12, the negative input end of the other end connection second operational amplifier IC4 of the twelfth resistor R12 simultaneously lead to
Thirteenth resistor R13 ground connection, the positive input terminal ground connection of the second operational amplifier IC4 are crossed, negative input end passes through the 14th electricity
R14 ground connection is hindered, output end connects the base stage of the first triode V1, and the emitter of the first triode V1 passes through the 14th resistance
R14 is grounded, output end OUT5 of the collector as slew rate adjustment circuit 4, and for connecting the amplitude conditioning electricity, the second of 7 is defeated
Enter end.In the present embodiment, the first operational amplifier IC3 connects into negative input reversed feedback amplifier structure, by the 8th resistance
The resistance value of R8 and eleventh resistor R11 are adjusted, the times magnification for the vision signal that can be provided logarithmic detector amplifying circuit 3
Number is adjusted, and to be adjusted to the slope of vision signal, the amplification factor of wherein vision signal is bigger, vision signal
Slope is higher.The signal of R13 pairs of the first operational amplifier IC3 outputs of twelfth resistor R12 and thirteenth resistor divides, and
Signal after partial pressure is supplied to second operational amplifier IC4, passes through the resistance to twelfth resistor R12 and thirteenth resistor R13
Value is adjusted, and can be adjusted to the starting point of vision signal, second operational amplifier IC4 and the first triode V1 connection shapes
At emitter follower.
In conjunction with shown in Fig. 7, the amplitude limiting amplifier circuit 5 includes the 15th to the 19th resistance R15~R19, the tenth to the
One end of 18 capacitance C10~C18 and limiting amplifier IC5, the tenth capacitance C10 are grounded by the 15th resistance R15, and conduct
The input terminal IN5 of amplitude limiting amplifier circuit 5, the first output end for connecting the power divider circuit 1, the tenth capacitance C10's is another
One end connects the pin 2 of limiting amplifier IC5, and the pin 1 and 12 of the limiting amplifier IC5 meets power supply 3.3V, and pin 13 connects
One end of the 18th resistance R18 is connect, the other end of the 18th resistance R18 is grounded and connects the electricity of the 17th capacitance C17 and the 18th
The second sys node of the first sys node of appearance C18, the 17th capacitance C17 and the 18th capacitance C18 meet power supply 3.3V, described
The pin 14 of limiting amplifier IC5 passes through the 14th capacitance C14 in parallel and the 17th resistance R17 ground connection, pin 8,15 and 16
Suspension, pin 3 are grounded by the 11st capacitance C11, and pin 4 and 9 is grounded, and pin 5 passes through the 12nd capacitance C12 in parallel and the
16 resistance R16 ground connection, for pin 6 by the 13rd capacitance C13 connections pin 7, pin 10 passes through concatenated 16th capacitance C16
With the 19th resistance R19 ground connection, pin 11 connects one end of the 15th capacitance C15, and the other end of the 15th capacitance C15 is as limit
The output end OUT6 of width amplifying circuit 5 connects the input terminal of the matching electricity 6.Amplitude limiting amplifier circuit is to from external input
Signal be amplified with after amplitude limit, output amplitude stablize, retain external input signal phase characteristic signal.
In conjunction with shown in Fig. 8, the match circuit 6 includes the 20th resistance R20, the 21st resistance R21 and the first inductance
L1, wherein one end of the first inductance L1 is grounded by the 20th resistance R20, and as the input terminal IN6 of match circuit 6,
The other end of output end for connecting the limited range enlargement electricity 5, the first inductance L1 is grounded by the 21st resistance R21, and
As the output end of match circuit 6, the first input end for connecting the amplitude modulate circuit 7.In the present embodiment, matching electricity
Road main function is the high impedance that 50 Ω of amplitude limiting amplifier circuit output end are impedance-matched to amplitude modulate circuit needs.
In conjunction with shown in Fig. 9, the amplitude modulate circuit 7 includes the 19th capacitance C19, the 20th capacitance C20, the 22nd
To the 27th resistance R22~R27, the second triode V2 and third transistor V3, wherein one end of the 19th capacitance C19
As the first input end IN7 of amplitude modulate circuit 7, the output end for connecting the match circuit 6, the 19th capacitance C19
The other end connect the base stage of the second diode V2, and power supply+5V is connect by the 22nd resistance R22, passes through the 23rd electricity
R23 ground connection is hindered, the collector of the second diode V2 meets power supply+5V, and emitter connects one end of the 24th resistance R24,
Second input terminal IN8 of the other end of 24th resistance R24 as amplitude modulate circuit 7 connects the slope adjustment electricity 4
Output end, the emitter of third transistor V3 connect one end of the 24th resistance R24, and collector is as amplitude modulate circuit 7
Output end OUT8 export the radiofrequency signal, and it is electric to pass through the 25th for connect with the input terminal of amplifier circuit 8
Resistance R25 meets power supply+5V, and base stage passes through the 26th respectively by the 27th resistance R27 and the 20th capacitance C20 ground connection
Resistance R26 meets power supply+5V.In the present embodiment, the second triode V2, third transistor V3 connect into differential amplifier arrangements, letter
The base stage for number entering the second triode V2 by partiting dc capacitor C19, passes through the collection of third transistor V3 after signal amplitude conditioning
Electrode exports.
In conjunction with shown in Figure 10, the amplifier circuit 8 includes the 21st capacitance C21, the 22nd capacitance C22, amplification
Device IC6, the 28th resistance R28 and the second inductance L2, wherein one end of the 21st capacitance C21 is as amplifier circuit 8
Input terminal, the output end for connecting the amplitude modulate circuit 7, the other end connection amplifier IC6 of the 21st capacitance C21
Input terminal, the output end of amplifier IC6 meets power supply+5V by concatenated 28th resistance R28, the second inductance L2, and even
Connect one end of the 22nd capacitance C22, the output end of the other end of the 22nd capacitance C22 as amplifier circuit 8, for defeated
Go out true logarithmic amplification signal.In the present embodiment, amplifier IC6 is low-noise amplifier, the 21st capacitance C21 and the 22nd
Capacitance C22 is partiting dc capacitor, and the 28th resistance R28 is direct current biasing resistance, and the second inductance L2 is filter inductance, amplifier
The effect of circuit is amplified to true logarithmic signal, and amplitude output signal and -1dB compression points are improved.
The present invention carries out selection design by the component of each built-up circuit to true logarithmic amplifier, can be further
The working frequency of true logarithmic amplifying circuit is improved, power consumption is reduced, reduces volume.
It is the test result of high-frequency low-power consumption true logarithmic amplifier of the present invention shown in Figure 11
Figure.Hookup is assembled according to the present invention, and the performance indicator of circuit is tested, test center's frequency is 2GHz,
The index of high-frequency low-power consumption true logarithmic amplifier of the present invention as can be seen from Figure 11：Input dynamic range DR is
61dB, log slope LS are 0.80mV/dB, and logarithmic precision δ is 0.94dB, and gain G V is 60.26dB；Circuit is powered by+5V, electricity
The electric current on road is 101mA, power consumption 505mW.The highest frequency of traditional true logarithmic amplifier can only achieve 500MHz, of the invention
The frequency of high-frequency low-power consumption true logarithmic amplifier is 2GHz, reaches as high as 2.7GHz.The power consumption one of traditional true logarithmic amplifier
As in 1.5W or more, the power consumption of high-frequency low-power consumption true logarithmic amplifier of the invention is only 0.501W.The high-frequency of the present invention
Low-power consumption true logarithmic amplifier uses the SMT (Surface Mounting Technology) or MCM (multi-chip of standard
Module) technique manufactures.
The present invention using by the logarithmic detector signal of input signal come in a manner of improving its limited range enlargement signal amplitude come real
Now true logarithmic amplification function.By selection component, circuit work frequency can be greatly improved, 2.7GHz is reached as high as, and
Circuit power consumption is reduced, volume is reduced, meanwhile, circuit consistency is preferable, convenient for producing in enormous quantities.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the present invention
Its embodiment.This application is intended to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the present invention and includes undocumented common knowledge in the art of the invention
Or conventional techniques.The description and examples are only to be considered as illustrative, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the invention is not limited in the precision architectures for being described above and being shown in the accompanying drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is limited only by the attached claims.
Claims (9)
1. a kind of high-frequency low-power consumption true logarithmic amplifier, which is characterized in that including：
Power divider circuit is transferred to attenuator and amplitude limiting amplifier circuit for input signal to be divided into two-way；
Attenuator, for carrying out attenuation processing to input signal, to adjust the starting point of logarithmic detector；
Logarithmic detector amplifying circuit, for after attenuation processing input signal carry out detection enhanced processing, with output with it is defeated
Enter vision signal of the signal amplitude at logarithmic relationship；
Slew rate adjustment circuit is adjusted for the slope to the vision signal, and the video signal transmission after adjustment is given
Amplitude modulate circuit；
Amplitude limiting amplifier circuit, for carrying out limited range enlargement processing to input signal；
Match circuit, for giving limited range enlargement treated input signal matching output to amplitude modulate circuit；
Amplitude modulate circuit, for according to the vision signal after adjustment changing rule, to limited range enlargement treated input believe
Number into line amplitude adjust, output by logarithmic parabola variation radiofrequency signal；
Amplifier circuit exports true logarithmic amplification signal for being amplified processing to the radiofrequency signal.
2. high-frequency low-power consumption true logarithmic amplifier according to claim 1, which is characterized in that the power divider circuit packet
The first capacitance and power splitter are included, for connecting input signal, the other end connects the power splitter for one end of first capacitance
First output end of input terminal, the power splitter connects the attenuator, and second output terminal connects the amplitude limiting amplifier circuit.
3. high-frequency low-power consumption true logarithmic amplifier according to claim 1, which is characterized in that the attenuator includes the
One resistance, second resistance and 3rd resistor, wherein one end of the first resistor is grounded by second resistance and is used to connect institute
Power divider circuit is stated, the other end is grounded by 3rd resistor and is used to connect the logarithmic detector amplifying circuit.
4. high-frequency low-power consumption true logarithmic amplifier according to claim 1, which is characterized in that the logarithmic detector amplification
Circuit includes logarithmic detector amplifier, third to the 7th resistance and the second to the 9th capacitance, wherein the one of second capacitance
End connects the attenuator, and the other end is by the 4th resistance eutral grounding and passes through logarithmic detector amplifier described in the 6th capacitance connection
The pin 1 and 4 of pin 2, the logarithmic detector amplifier all connects power supply, and pin 1 is separately connected the 7th capacitance of ground connection
With the 8th capacitance, pin 4 is separately connected the 4th capacitance and the 5th capacitance of ground connection, and the pin 3 of the logarithmic detector amplifier connects
The third capacitance of ground connection, pin 5,6,7,8,10,13,15,16 are grounded, the 9th capacitance of the connection ground connection of pin 14, pin 11
It is connect with the slew rate adjustment circuit with after 12 short circuits, the one end with the 5th resistance, the 6th resistance and the 7th resistance respectively of pin 9
The other end ground connection of connection, the 5th resistance and the 6th resistance, another termination power of the 7th resistance.
5. high-frequency low-power consumption true logarithmic amplifier according to claim 1, which is characterized in that the slew rate adjustment circuit
Including the 8th to the 14th resistance, the first operational amplifier, second operational amplifier and the first triode, wherein the 8th resistance
One end connects the logarithmic detector amplifying circuit, and the other end connects the negative input end of the first operational amplifier and by the 11st electricity
Resistance connects the output end of first operational amplifier, and the positive input terminal of first operational amplifier is separately connected the 9th resistance
With one end of the tenth resistance, another termination power of the 9th resistance, the other end ground connection of the tenth resistance, first operation amplifier
One end of the output end connection twelfth resistor of device, bearing for the other end connection second operational amplifier of the twelfth resistor are defeated
Enter to hold and be grounded by thirteenth resistor, the positive input terminal ground connection of the second operational amplifier, negative input end passes through the 14th
Resistance eutral grounding, output end connect the base stage of the first triode, the emitter of first triode by the 14th resistance eutral grounding,
Collector is for connecting the amplitude modulate circuit.
6. high-frequency low-power consumption true logarithmic amplifier according to claim 1, which is characterized in that the amplitude limiting amplifier circuit
Including the 15th to the 19th resistance, the tenth to the 18th capacitance and limiting amplifier, one end of the tenth capacitance passes through the 15th
Resistance eutral grounding is simultaneously used to connect the power divider circuit, and the other end connects the pin 2 of limiting amplifier, the limiting amplifier
Pin 1 and 12 connects power supply, and pin 13 connects one end of the 18th resistance, and the other end of the 18th resistance is grounded and connects the 17th
Second sys node of the first sys node of capacitance and the 18th capacitance, the 17th capacitance and the 18th capacitance connects power supply, institute
The pin 14 of limiting amplifier is stated by the 14th capacitance and the 17th resistance eutral grounding in parallel, pin 8,15 and 16 suspends, pipe
By the 11st capacity earth, pin 4 and 9 is grounded foot 3, pin 5 by the 12nd capacitance and the 16th resistance eutral grounding in parallel,
Pin 6 passes through concatenated 16th capacitance and the 19th resistance eutral grounding, pin by the 13rd capacitance connection pin 7, pin 10
11 pass through match circuit described in the 15th capacitance connection.
7. high-frequency low-power consumption true logarithmic amplifier according to claim 1, which is characterized in that the match circuit includes
20th resistance, the 21st resistance and the first inductance, wherein one end of first inductance by the 20th resistance eutral grounding simultaneously
For connecting the amplitude limiting amplifier circuit, the other end improves electricity by the 21st resistance eutral grounding and for connecting the amplitude
Road.
8. high-frequency low-power consumption true logarithmic amplifier according to claim 1, which is characterized in that the amplitude modulate circuit
Including the 19th capacitance, the 20th capacitance, the 22nd to the 27th resistance, the second triode and third transistor, wherein
For connecting the match circuit, the other end connects the base stage of the second diode for one end of 19th capacitance, and passes through the
22 resistance connect power supply, and by the 23rd resistance eutral grounding, the collector of second diode connects power supply, emitter connection
The other end of one end of 24th resistance and the emitter for connecting third transistor, the 24th resistance connects the slope tune
Whole circuit, the collector of third transistor is for exporting the radiofrequency signal and connecting power supply, base stage by the 25th resistance
Respectively by the 27th resistance and the 20th capacity earth, and power supply is connected by the 26th resistance.
9. high-frequency low-power consumption true logarithmic amplifier according to claim 1, which is characterized in that the amplifier circuit packet
The 21st capacitance, the 22nd capacitance, amplifier, the 28th resistance and the second inductance are included, wherein the 21st capacitance
One end connects the input terminal of amplifier for connecting the amplitude modulate circuit, the other end, and the output end of amplifier passes through series connection
The 28th resistance, the second inductance connection power supply, and connect the 22nd capacitance one end, the other end of the 22nd capacitance
For exporting the true logarithmic amplification signal.
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| CN201810181516.9A CN108306621A (en) | 2018-03-06 | 2018-03-06 | High-frequency low-power consumption true logarithmic amplifier |
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| CN201810181516.9A CN108306621A (en) | 2018-03-06 | 2018-03-06 | High-frequency low-power consumption true logarithmic amplifier |
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| CN110988931A (en) * | 2019-10-31 | 2020-04-10 | 北京遥测技术研究所 | Clock self-checking circuit based on AD8310 detector |
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| CN113884847A (en) * | 2021-08-11 | 2022-01-04 | 国网天津市电力公司电力科学研究院 | Large-dynamic-range partial discharge ultrahigh frequency signal detection circuit |
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Application publication date: 20180720 |