CN116545391A - True logarithmic amplifier with self-adaptive temperature compensation - Google Patents

True logarithmic amplifier with self-adaptive temperature compensation Download PDF

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Publication number
CN116545391A
CN116545391A CN202310503750.XA CN202310503750A CN116545391A CN 116545391 A CN116545391 A CN 116545391A CN 202310503750 A CN202310503750 A CN 202310503750A CN 116545391 A CN116545391 A CN 116545391A
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resistor
amplifier
signal
logarithmic
amplitude
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杨超
肖田海
杨帆
庞佑兵
刘登学
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CETC 24 Research Institute
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CETC 24 Research Institute
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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
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

The invention provides a self-adaptive temperature-compensated true logarithmic amplifier, which comprises an input matching network, a detection circuit and a control circuit, wherein the input matching network is respectively connected with an external signal input end and a continuous detection type logarithmic amplifier; the continuous detection type logarithmic amplifier is used for demodulating and logarithmically processing the signal input by the matching circuit; the self-adaptive temperature controller is used for compensating the output signal according to the temperature change; the input end of the limiting amplifier is connected with the output end of the input matching network and is used for outputting signals with stable amplitude; and the input ends of the amplitude-adjustable amplifier are respectively connected with the output ends of the limiting amplifier and the linear voltage-current converter, and the amplitude-adjustable amplifier is used for outputting signals which have logarithmic relation with external input signals, keep frequency and keep phase characteristic information of the input signals. The invention can carry out logarithmic amplification processing on the pulse modulation signal, and can carry out gain adjustment and temperature compensation according to an internal temperature feedback system.

Description

True logarithmic amplifier with self-adaptive temperature compensation
Technical Field
The invention relates to the field of integrated circuits, in particular to a true logarithmic amplifier with self-adaptive temperature compensation.
Background
In radar, telemetry equipment, communication receiver and other system applications, when the input signal is a bipolar pulse amplitude modulation signal with a larger dynamic range (the signal amplitude may be from a few microvolts to a few volts), high-gain amplification is required to be performed on a small signal, gain compression is performed on a large signal, an output signal with a smaller dynamic range is obtained, and the amplitude and phase information of the signal are completely reserved for processing by a later module (such as an AD sampling circuit). The processing circuit is required to have a large dynamic range compression and high gain, and can retain the signal amplitude and phase information. In engineering, a true logarithmic amplifier is generally used for realizing the signal processing function, but a traditional true logarithmic amplifier has larger deviation under the influence of temperature under the high and low temperature conditions.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a self-adaptive temperature-compensated true logarithmic amplifier which can carry out logarithmic amplification processing on a pulse modulation signal, the processed signal can completely retain the amplitude and phase information of an original signal, an internal gain adjusting function is added, and the self-adaptive temperature-compensated true logarithmic amplifier can carry out gain adjustment according to an internal temperature feedback system to carry out temperature compensation. The method mainly solves the problem that the gain of the traditional true logarithmic amplifier is fixed and temperature compensation cannot be performed.
In order to achieve the above and other objects, the present invention adopts the following technical scheme.
The application provides an adaptive temperature compensated true log amplifier comprising:
the input matching network is respectively connected with the external signal input end and the continuous detection type logarithmic amplifier;
the continuous detection type logarithmic amplifier is respectively connected with an external power supply, an input matching network and a singlechip, and is used for amplifying and detecting an external input signal step by step and outputting a video signal in logarithmic relation with the amplitude of the external input signal;
the input end of the limiting amplifier is connected with the output end of the input matching network, the limiting amplifier amplifies and limits an external input signal, and outputs a signal with stable amplitude and retaining the phase characteristic of the external input signal;
the input end of the amplitude-adjustable amplifier is respectively connected with the output ends of the limiting amplifier and the linear voltage-current converter, and after the limiting signal from the limiting amplifier is subjected to linear amplitude modulation of the current signal output by the linear voltage-current converter, a signal which has the logarithmic relation and the frequency consistent with the external input signal and keeps the phase characteristic information of the external input signal is output;
and the self-adaptive temperature controller is respectively connected with the continuous detection type logarithmic amplifier and the power supply end and is used for compensating an output signal according to temperature change.
In an embodiment of the present application, the external input signal is split into two paths:
one path enters the limiting amplifier to acquire a first output signal with stable amplitude; the other path of signal enters the continuous detection type logarithmic amplifier to acquire a video signal in logarithmic relation with the amplitude of the external input signal; and then, the two paths of signals are subjected to linear amplitude modulation by the amplitude-adjustable amplifier to obtain a second output signal, wherein the amplitude of the second output signal is in logarithmic relation with the amplitude of an external input signal, the output frequency is the same as the input frequency, and the phase information of the external input signal is reserved.
In an embodiment of the present application, the video signal is collected by the adaptive temperature controller and output is controlled in combination with a temperature sensing signal.
In an embodiment of the present application, the input matching network includes: a first resistor, a first capacitor and a second capacitor.
The first end of the first capacitor is used for being connected with the external input signal and is connected with the first end of the continuous detection type logarithmic amplifier; the first end of the first resistor is connected with the second end of the first capacitor end and is connected with the second end of the continuous detection type logarithmic amplifier; the first end of the second capacitor is connected with the second end of the first resistor and is connected with the second end of the continuous detection type logarithmic amplifier; and the output end of the input matching network is respectively connected with a limiting amplifier and a continuous detection type logarithmic amplifier.
In one embodiment of the present application, the connection circuit of the limiting amplifier, the continuous detection logarithmic amplifier and the amplitude-adjustable amplifier includes: a second resistor, a third capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor;
the second resistor is respectively connected with the third capacitor and the continuous detection type logarithmic amplifier;
the third resistor is respectively connected with the continuous detection type logarithmic amplifier, the fourth resistor and the tenth resistor;
the third resistor is respectively connected with the continuous detection type logarithmic amplifier, the fourth resistor and the tenth resistor;
the two ends of the fourth resistor are respectively connected with the third resistor and the tenth resistor;
the fifth resistor is respectively connected with the continuous detection type logarithmic amplifier, the sixth resistor and the eighth resistor;
the sixth resistor is connected with the fifth resistor and the eighth resistor respectively.
In an embodiment of the present application, the limiting amplifier, the continuous detection logarithmic amplifier and the amplitude-adjustable amplifier module are implemented by using an integrated SF8309 integrated circuit, and a port of the SF8309 integrated circuit includes INHI, INLO, LMHI, VLOG and LMDR;
the input signal enters a limiting amplifier/continuous detection type logarithmic amplifier through the input end through the first capacitor and the input matching network, and the INHI end of SF8309 is connected with the second end of the first capacitor and the first end of the first resistor; the INLO end of the SF8309 is grounded through a second capacitor, and the LMDR end of the SF8309 is connected with the self-adaptive temperature controller through a fifth resistor, a seventh resistor and an eighth resistor; the LMLO of SF8309 is connected with a power supply, and the LMHI end is connected with the power supply through a second resistor and then is connected with the output end through a third resistor; the VLOG of SF8309 is a logarithmic output connected to an adaptive temperature controller via a third resistor, a ninth resistor and a tenth resistor.
In an embodiment of the present application, the SF8309 integrated circuit further includes: dynamic range, main gain unit, full wave detector, differential amplifier/limiter unit, broadband attenuator, detector unit;
wherein, SF8309 integrated circuit's dynamic range: 90dB; the main channel of the SF8309 integrated circuit is formed by cascading 6-level differential amplifier/limiting units, the gain of each level is 12dB, and the total gain is 72dB; the amplitude adjustable amplifier provides additional gain; each main gain unit also comprises a full wave detector; four detection units driven by a broadband attenuator extend the high end of the dynamic range by 48dB.
In one embodiment of the present application, the adaptive temperature controller includes: the input end of the singlechip U2 with the temperature sensor is connected with the output end of the continuous detection type logarithmic amplifier, and the output end of the singlechip is connected with the amplitude adjustable amplifier.
In an embodiment of the present application, the adaptive temperature controller performs temperature compensation on the continuous detection type logarithmic amplifier by collecting logarithmic output information and self temperature sensor information.
As described above, an adaptive temperature compensated true logarithmic amplifier of the present invention is implemented using an input matching network, a continuous detection logarithmic amplifier, a limiting amplifier, an amplitude adjustable amplifier, and an adaptive temperature controller connection. The continuous detection type logarithmic amplifier with the adjustable output signal and the singlechip with the temperature sensor are selected, so that the logarithmic compression and amplification functions of the input signal are realized, and meanwhile, devices with different temperature drifts are compensated through the singlechip program, and the complexity caused by hardware adjustment is greatly reduced; the circuit has the advantages of large input dynamic range, wide power supply application range and adjustable gain; the signal gain can be compensated by software according to the temperature drift difference of the devices at different temperatures; the temperature compensation can be self-adaptive under the high-low temperature condition, the production cost is reduced, fewer components are adopted, and the cost is low. The circuit of the invention does not need to be debugged, and is convenient for mass production.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 is a circuit block diagram of the present invention;
FIG. 2 is a circuit diagram of an adaptive temperature compensated true log amplifier in accordance with one embodiment of the present invention;
FIG. 3 is a circuit block diagram of temperature adaptive compensation control in the present invention;
reference numerals illustrate: 1-input matching network, 2-continuous detection type logarithmic amplifier, 3-limiting amplifier, 4-self-adaptive temperature controller and 5-amplitude adjustable amplifier.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
The inventor researches and discovers that when an input signal is a bipolar pulse amplitude modulation signal with a larger dynamic range (the signal amplitude may be from a few microvolts to a few volts) in system applications such as radar, telemetry equipment, communication receivers and the like, high-gain amplification is required to be carried out on a small signal, gain compression is carried out on a large signal, an output signal with a smaller dynamic range is obtained, and amplitude and phase information of the signal are completely reserved for processing by a later module (such as an AD sampling circuit). The processing circuit is required to have a large dynamic range compression and high gain, and can retain the signal amplitude and phase information. In engineering, a true logarithmic amplifier is generally used for realizing the signal processing function, but a traditional true logarithmic amplifier has larger deviation under the influence of temperature under the high and low temperature conditions.
In order to realize the signal processing function, the invention designs a self-adaptive temperature-compensated true logarithmic amplifier which can carry out logarithmic amplification processing on a pulse modulation signal, and the processed signal can completely retain the amplitude and phase information of an original signal and can be compensated automatically according to temperature change. Aiming at the defect that the traditional true logarithmic amplifier has fixed gain and cannot perform temperature compensation, an internal gain adjusting function is added, and the gain can be adjusted according to an internal temperature feedback system to perform temperature compensation.
The invention provides a self-adaptive temperature-compensated true logarithmic amplifier which can carry out logarithmic amplification on intermediate frequency signals with wider input amplitude range (mu V level to V level), completely retain the amplitude and phase information of the signals, has no broadening of pulse width, high small signal gain and large input dynamic range. Compared with the traditional true logarithmic amplifier, the circuit provided by the invention can be self-adaptively compensated in temperature under high and low temperature conditions, so that the production cost is reduced, fewer components are adopted, the circuit does not need to be debugged, and the circuit is convenient for mass production.
Referring to fig. 1, the present invention provides a true logarithmic amplifier with adaptive temperature compensation to realize logarithmic amplification of large dynamic pulse modulation signals, and meanwhile, to perform temperature compensation on signal gain.
The technical scheme adopted by the invention for realizing the functions is that temperature compensation is added on the basis of a common true logarithmic amplifier, and the self-adaptive adjusting part specifically comprises:
the input matching network is respectively connected with the external signal input end and the continuous detection type logarithmic amplifier;
the continuous detection type logarithmic amplifier is respectively connected with an external power supply, an input matching network and a singlechip and is used for amplifying and detecting an external input signal step by step and outputting a video signal in logarithmic relation with the amplitude of the input signal;
the input end of the limiting amplifier is connected with the output end of the input matching network, amplifies and limits the external input signal, and outputs a signal with stable amplitude and retaining the phase characteristic of the external input signal;
the input end of the amplitude-adjustable amplifier is respectively connected with the output ends of the limiting amplifier and the linear voltage-current converter, and after the limiting signal from the limiting amplifier is subjected to linear amplitude modulation of the current signal output by the linear voltage-current converter, a signal which has the logarithmic relation with the external input signal, keeps the frequency consistent and keeps the phase characteristic information of the input signal is output;
and the self-adaptive temperature controller is respectively connected with the continuous detection type logarithmic amplifier and the power supply end and is used for compensating an output signal according to temperature change.
The working principle of the technical scheme of the invention is as follows:
the external input signal is split into two paths: one path enters a limiting amplifier circuit to obtain an output signal with stable amplitude, the signal frequency is the same as that of an input signal, and the phase information (formula 1) of the input signal is reserved; the other path of signal enters a continuous detection type logarithmic amplifier to obtain a video signal (formula 2) in logarithmic relation with the amplitude of the input signal; the output signal of the temperature sensing signal is shown in a formula 3; the video signal is collected by an adaptive temperature controller and output is controlled in combination with a temperature sensing signal (equation 4). Then, the amplitude of the output signal is obtained after the two paths of signals are linearly amplitude-modulated by the amplitude-adjustable amplifier, the amplitude of the output signal and the amplitude of the input signal are in logarithmic relation, the output frequency and the input frequency are the same, the phase information of the input signal is reserved, and the circuit realizes the true logarithmic amplification function of self-adaptive temperature compensation (formula 5).
V O1 ＝Acos(ω 0 t+ΔΦ)(1)
In equation 1, VO1 is the phase output, ΔΦ is the phase change, A is the amplitude limiting level (constant), ω 0 t is the input frequency.
V O2 ＝V Y log(V IN /V X )(2)
In equation 2: VO2 is logarithmic output voltage, V Y Is of logarithmic efficiency, V IN Is the input voltage; v (V) X Is the logarithmic starting point voltage (input voltage at output of 0).
V 03 ＝S p *T+V1(3)
In equation 3: VO3 is the output voltage of the temperature sensor, sp is the conversion slope, and T is the temperature; v1 is a starting point voltage (output voltage at a temperature of 0).
I L ＝f(V O2 ,V O3 )(4)
In equation 4: i L For output current, f is compensation algorithm, V O2 Is the logarithmic output voltage, V O3 Is the temperature sensor output voltage.
V O ＝V 01 ×R2×I L ＝Acos(ω 0 t+ΔΦ)×R2×f(V Y log(V IN /V X ),S p *T+V1)(5)
Equation 5 is actually a transmission characteristic equation of the true logarithmic amplifier, and includes amplitude information, frequency information and phase information of the input signal.
Referring to fig. 2, fig. 2 is a circuit diagram of an adaptive temperature compensated true log amplifier embodying the present invention.
In one embodiment, an input matching network includes:
a first end of the first resistor R1, R1 is connected with a second end of the first capacitor C1, and is connected with an INHI end of the continuous detection type logarithmic amplifier U1; the second terminal of R1 is connected to the first terminal of capacitor C2 and to INLO of the continuous detection logarithmic amplifier U1.
A first terminal of a first capacitor C1, C1 is connected to the input terminal IN; the second end of the C1 is connected with the first end of the first resistor R1 and is connected with the INHI end of the continuous detection type logarithmic amplifier U1;
a second capacitor C2, C2 having a first terminal connected to the second terminal of the first resistor R1 and connected to the INLO of the continuous detection logarithmic amplifier U1;
referring to fig. 2, in one embodiment, an input terminal of the input matching network is connected to an input terminal of an external input signal through a first dc blocking capacitor (C1); the output end of the digital amplifier is connected with the 4_INHI end of the continuous detection type logarithmic amplifier.
In more detail, the input end of the input matching network is connected with the input end of the external input signal, and the output end of the input matching network is respectively connected with a limiting amplifier and a continuous detection type logarithmic amplifier. The input matching network consists of a resistor (R1) and a capacitor (C2); the input impedance is 40-60 ohms.
Referring to fig. 2, in one embodiment, the connection circuit of the continuous detection logarithmic amplifier, the limiting amplifier and the amplitude adjustable over-amplifier includes:
the first ends of the second resistors R2 and R2 are connected with an external power supply; the second end of R2 is connected with the first end of the third capacitor and is connected with the LMHI end of the continuous detection logarithmic amplifier U1;
a first end of a third resistor R3, R3 is connected with the VLOG end of the continuous detection logarithmic amplifier U1; the second end of R3 is connected with the first end of the fourth resistor R4 and is connected with the second end of the tenth resistor R10.
A fourth resistor R4, the first terminal of R4 being connected to the second terminal of R3 and simultaneously to the second terminal of the tenth resistor R10; the second terminal of R4 is grounded.
A fifth resistor R5, R5 has a first terminal connected to the LMDR of the continuous detection logarithmic amplifier U1; the second terminal is connected to the first terminal of the sixth resistor R6 and to the second terminal of the eighth resistor R8.
A first end of a sixth resistor R6, R6 is connected with a second end of the fifth resistor R5 and is connected with a second end of an eighth resistor R8; the second end is connected to ground.
The COM2, PADL and COM1 of the SF8309 integrated circuits U1 and U1 are connected with the ground; VPS1, ENBL, VPS2 and LMLO are connected with a power supply end; INHI is connected to the second end of the first capacitor C1 and is connected to the first end of the first resistor R1; the INLO is connected with the second end of the first resistor and is connected with the first end of the second capacitor; VLOG is connected to a first terminal of a third resistor R3; LMHI is connected to the second terminal of the second resistor R2 and simultaneously to the first terminal of the third capacitor C3; the LMDR is coupled to a first terminal of a fifth resistor R5.
In one embodiment, the limiting amplifier, the continuous detection logarithmic amplifier and the amplitude-adjustable amplifier module are implemented by an integrated SF8309 integrated circuit, and the ports of the SF8309 integrated circuit comprise INHI, INLO, LMHI, VLOG and LMDR;
an external input signal enters a limiting amplifier/continuous detection type logarithmic amplifier through an input end through the first capacitor and the input matching network, and an INHI end of SF8309 is connected with a second end of the first capacitor and is connected with a first end of a first resistor; the INLO end of SF8309 is grounded through a second capacitor, and the LMDR end of SF8309 is connected with the self-adaptive temperature controller through a fifth resistor, a seventh resistor and an eighth resistor. The LMLO of SF8309 is connected with the power supply, and the LMHI end is connected with the power supply through the second resistor and then is connected with the output end through the third resistor. The VLOG of SF8309 is a logarithmic output connected to an adaptive temperature controller via a third resistor, a ninth resistor and a tenth resistor.
In one embodiment, a continuous detection logarithmic amplifier integrated into the SF8309 integrated circuit (U1) is used to demodulate and digitize the signal input from the matching circuit. The power supply terminals 2_VPS1 and 15_VPS2 are connected with an external power supply terminal; the input end 4_INHI is connected with the output of the matching network, the output end 12_LMHI is connected with the C3 of the blocking capacitor, and the 16_VLOG is connected with the 15_P1.7 end of the singlechip C8051F 411.
In more detail, the input end of the continuous detection type logarithmic amplifier is connected with the input matching network, the output end of the continuous detection type logarithmic amplifier is connected with a linear power supply current converter, the continuous detection type logarithmic amplifier is used for amplifying and detecting an input signal from the outside step by step, and a video signal in logarithmic relation with the amplitude of the input signal is output; the requirements for a continuous detection logarithmic amplifier are: the dynamic range must be able to cover the input dynamic range of the entire true log amplifier, and its log precision must be able to guarantee the requirements of the entire circuit, and the operating frequency must be able to cover the operating frequency of the entire true log amplifier.
In one embodiment, the limiting amplifier integrated in the SF8309 integrated circuit (U1) has an input terminal connected to the output terminal of the input matching network, and outputs a signal with stable amplitude and retaining the phase characteristics of the external input signal after amplifying and limiting the external input signal.
In more detail, the limiting amplifier has an input connected to the input matching network and an output connected to an amplitude-adjustable amplifier, which amplifies and limits an input signal from the outside and outputs a signal having a stable amplitude while maintaining the phase characteristics of the input signal. The requirements for the limiting amplifier are: the output amplitude must be kept stable throughout the dynamic range of the input signal and its operating frequency must cover the range required by the entire circuit. For example, to develop a true logarithmic amplifier with a dynamic range of 90dB (a 90 dBm-0 dBm), it is required that the limiting amplifier output amplitude be substantially unchanged at least over the dynamic range of-90 dBm-0 dBm of the input signal.
In one embodiment, the input end of the amplitude-adjustable amplifier integrated in the SF8309 integrated circuit is respectively connected with the output ends of the limiting amplifier and the linear voltage-current converter, the limiting signal from the limiting amplifier is subjected to linear amplitude modulation of the current signal output by the linear voltage-current converter, then the output is in logarithmic relation with the external input signal, the frequency is kept consistent with the input signal, and meanwhile, the phase information of the input signal is kept.
It should be noted that, the limiting amplifier, the detection type logarithmic amplifier and the amplitude adjustable amplifier module in the invention are realized by adopting an integrated SF8309 integrated circuit.
In one embodiment, the SF8309 integrated circuit comprises: dynamic range, main gain unit, full wave detector, differential amplifier/limiter unit, broadband attenuator, detector unit;
dynamic range of SF 8309: 90dB; logarithmic accuracy: + -0.5 dB; bandwidth: 5 MHz-500 MHz; clipping range: 87dB; phase change: (+ -3 ℃; power supply current: 16 mA/2.7V-5V, volume: 16 pin SSOP package. The requirements of a true logarithmic amplifier can be guaranteed.
The main channel of SF8309 is formed by cascade connection of 6-level differential amplifier/amplitude limiting units, the gain of each level is 12dB, the bandwidth of-3 dB is 850MHz, and the total gain is 72dB; the amplitude adjustable amplifier can provide a maximum of 18dB of gain. Each main gain unit also comprises a full-wave detector; the high end of the dynamic range can be extended by 48dB with four detection units driven by a broadband attenuator.
According to one embodiment of fig. 2. The input dynamic range can reach 100dB, from-78 dB to +22dB; the power supply can be 3-5V, and the application range is wide; the output gain can be adjusted by adjusting the fifth resistor R5 and the sixth resistor R6.
In one embodiment, an adaptive temperature controller includes: the input end of the singlechip U2 with the temperature sensor is connected with the output end of the continuous detection type logarithmic amplifier, and the output end of the singlechip is connected with the amplitude adjustable amplifier.
In more detail, referring to fig. 2 and 3, an input end of a singlechip with a temperature sensor is connected with an output end of a continuous detection type logarithmic amplifier, a voltage signal from the continuous detection type logarithmic amplifier is converted into a compensated current signal according to a conversion algorithm by combining a temperature sensing signal, and the output end of the singlechip with the temperature sensor is connected with an amplitude adjustable amplifier.
In more detail, referring to fig. 2, in an embodiment, GND of the single-chip microcomputer U2, U2 with a temperature sensor is connected to ground; the VDD terminal is connected with the power supply terminal; P0.0/IDAC0 is connected with the second pin of the seventh resistor R7 and is connected with the first pin of the eighth resistor R8; the pin P1.7 is connected to the first pin of the ninth resistor R9 and to the first pin of the tenth resistor R10.
IN more detail, referring to fig. 2, IN one embodiment, an external input signal enters an INHI end of a limiting amplifier/continuous detection logarithmic amplifier SF8309 (U1) through an input end IN via a blocking capacitor (C1) and an input matching network, an INLO end of the SF8309 is grounded through a capacitor (C2), and an LMDR end of the SF8309 is connected to a control signal output (i.e. an output of a single chip U2) via impedance matching resistors R5, R6, R7, R8. The LMLO of SF8309 is connected with the power supply, the LMHI end is connected with the power supply through a resistor (R2), and then is connected with the output end through a blocking capacitor (C3). The VLOG of SF8309 is a logarithmic output end and is connected with the interface of the singlechip P1.7 through matching resistors (R3, R4, R9 and R10).
Referring to fig. 2 and 3, in one embodiment, the logarithmic output information collected by the adaptive temperature controller and the self temperature sensor information are used to compensate the temperature of the detection logarithmic amplifier through the output end thereof.
In more detail, the adaptive temperature controller is used for compensating the output signal according to the temperature change. The input end 15_P1.7 is connected with a continuous detection type logarithmic amplifier; the output terminal 16_P0.0_IDAC0 is connected to the 9_MLDR terminal of the continuous detection logarithmic amplifier, while 6_VDD is connected to the power supply terminal.
According to one implementation of the circuit scheme of fig. 2, the adaptive temperature controller compensates the temperature of the detection logarithmic amplifier through the output port P0.0/IDAC0 by collecting logarithmic output information and self temperature sensor information through P1.7.
In summary, the adaptive temperature compensated true logarithmic amplifier of the present invention is implemented by connecting an input matching network, a continuous detection logarithmic amplifier, a limiting amplifier, an amplitude adjustable amplifier, and an adaptive temperature controller. By selecting the continuous detection type logarithmic amplifier with the adjustable output signal and the singlechip with the temperature sensor, the logarithmic compression and amplification functions of the input signal are realized, and meanwhile, devices with different temperature drift are compensated through the singlechip program, so that the complexity brought by hardware adjustment is greatly reduced. The circuit has the following characteristics:
(1) The circuit has the characteristics of large input dynamic range, wide power supply application range and adjustable gain.
According to one embodiment of fig. 2. The input dynamic range can reach 100dB, from-78 dB to +22dB; the power supply can be 3-5V, and the application range is wide; the output gain can be adjusted by adjusting the fifth resistor R5 and the sixth resistor R6.
(2) The circuit can compensate signal gain through software according to the temperature drift difference of devices at different temperatures.
According to one implementation of the circuit scheme of fig. 2, the adaptive temperature controller compensates the temperature of the detection logarithmic amplifier through the output port P0.0/IDAC0 by collecting logarithmic output information and self temperature sensor information through P1.7.
(3) The circuit provided by the invention can be self-adaptively temperature-compensated under high and low temperature conditions, so that the production cost is reduced, fewer components are adopted, and the cost is low. The circuit of the invention does not need to be debugged, and is convenient for mass production.
In the above embodiments, unless otherwise specified the description of a common object by use of a sequence number "first", "second", etc., merely indicates that it refers to a different instance of the same object, and is not intended to indicate that the described object must take a given order, whether temporally, spatially, in ranking, or in any other manner.
Reference in the specification to "this embodiment," "one embodiment," "another embodiment," or "other embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least some embodiments, but not necessarily all embodiments. Multiple occurrences of "this embodiment," "one embodiment," "another embodiment," and "like" do not necessarily all refer to the same embodiment. If the specification states a component, feature, structure, or characteristic "may", "might", or "could" be included, that particular component, feature, structure, or characteristic is not required to be included. If the specification or claim refers to "a" or "an" element, that does not mean there is only one of the element. If the specification or claims refer to "an additional" element, that does not preclude there being more than one of the additional element.
In the above embodiments, while the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory structures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed. The embodiments of the invention are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. It is therefore intended that all equivalent modifications and changes made by those skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the appended claims.

Claims (9)

1. An adaptive temperature-compensated true log amplifier comprising:
the input matching network is respectively connected with the external signal input end and the continuous detection type logarithmic amplifier;
the continuous detection type logarithmic amplifier is respectively connected with an external power supply, an input matching network and a singlechip, and is used for amplifying and detecting an external input signal step by step and outputting a video signal in logarithmic relation with the amplitude of the external input signal;
the input end of the limiting amplifier is connected with the output end of the input matching network, the limiting amplifier amplifies and limits an external input signal, and outputs a signal with stable amplitude and retaining the phase characteristic of the external input signal;
the input end of the amplitude-adjustable amplifier is respectively connected with the output ends of the limiting amplifier and the linear voltage-current converter, and after the limiting signal from the limiting amplifier is subjected to linear amplitude modulation of the current signal output by the linear voltage-current converter, a signal which has the logarithmic relation and the frequency consistent with the external input signal and keeps the phase characteristic information of the external input signal is output;
and the self-adaptive temperature controller is respectively connected with the continuous detection type logarithmic amplifier and the power supply end and is used for compensating an output signal according to temperature change.
2. An adaptive temperature compensated true logarithmic amplifier according to claim 1, wherein said external input signal splits into two paths:
one path enters the limiting amplifier to acquire a first output signal with stable amplitude; the other path of signal enters the continuous detection type logarithmic amplifier to acquire a video signal in logarithmic relation with the amplitude of the external input signal; and then, the two paths of signals are subjected to linear amplitude modulation by the amplitude-adjustable amplifier to obtain a second output signal, wherein the amplitude of the second output signal is in logarithmic relation with the amplitude of an external input signal, the output frequency is the same as the input frequency, and the phase information of the external input signal is reserved.
3. An adaptive temperature compensated true logarithmic amplifier according to claim 2, wherein said video signal is collected by said adaptive temperature controller and output is controlled in conjunction with a temperature sensing signal.
4. An adaptive temperature compensated true logarithmic amplifier according to claim 1, wherein said input matching network comprises: a first resistor, a first capacitor and a second capacitor;
the first end of the first capacitor is used for being connected with the external input signal and is connected with the first end of the continuous detection type logarithmic amplifier; the first end of the first resistor is connected with the second end of the first capacitor end and is connected with the second end of the continuous detection type logarithmic amplifier; the first end of the second capacitor is connected with the second end of the first resistor and is connected with the second end of the continuous detection type logarithmic amplifier; and the output end of the input matching network is respectively connected with a limiting amplifier and a continuous detection type logarithmic amplifier.
5. An adaptive temperature compensated true logarithmic amplifier according to claim 1, wherein said connection of limiting amplifier, continuous detection logarithmic amplifier and amplitude adjustable amplifier comprises: a second resistor, a third capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor;
the second resistor is respectively connected with the third capacitor and the continuous detection type logarithmic amplifier;
the third resistor is respectively connected with the continuous detection type logarithmic amplifier, the fourth resistor and the tenth resistor;
the third resistor is respectively connected with the continuous detection type logarithmic amplifier, the fourth resistor and the tenth resistor;
the two ends of the fourth resistor are respectively connected with the third resistor and the tenth resistor;
the fifth resistor is respectively connected with the continuous detection type logarithmic amplifier, the sixth resistor and the eighth resistor;
the sixth resistor is connected with the fifth resistor and the eighth resistor respectively.
6. The adaptive temperature compensated true logarithmic amplifier of claim 5, wherein said limiting amplifier, continuous detection logarithmic amplifier, and amplitude adjustable amplifier module are implemented with an integrated SF8309 integrated circuit, the ports of said SF8309 integrated circuit comprising INHI, INLO, LMHI, VLOG and LMDR;
the external input signal enters a limiting amplifier/continuous detection type logarithmic amplifier through the input matching network through the input end, and the INHI end of SF8309 is connected with the second end of the first capacitor and the first end of the first resistor; the INLO end of the SF8309 is grounded through a second capacitor, and the LMDR end of the SF8309 is connected with the self-adaptive temperature controller through a fifth resistor, a seventh resistor and an eighth resistor; the LMLO of SF8309 is connected with a power supply, and the LMHI end is connected with the power supply through a second resistor and then is connected with the output end through a third resistor; the VLOG of SF8309 is a logarithmic output connected to an adaptive temperature controller via a third resistor, a ninth resistor and a tenth resistor.
7. An adaptive temperature-compensated true logarithmic amplifier according to claim 6, wherein said SF8309 integrated circuit further comprises: dynamic range, main gain unit, full wave detector, differential amplifier/limiter unit, broadband attenuator, detector unit;
wherein, SF8309 integrated circuit's dynamic range: 90dB; the main channel of the SF8309 integrated circuit is formed by cascading 6-level differential amplifier/limiting units, the gain of each level is 12dB, and the total gain is 72dB; the amplitude adjustable amplifier provides additional gain; each main gain unit also comprises a full wave detector; four detection units driven by a broadband attenuator extend the high end of the dynamic range by 48dB.
8. An adaptive temperature-compensated true logarithmic amplifier according to claim 1, wherein said adaptive temperature controller comprises: the input end of the singlechip U2 with the temperature sensor is connected with the output end of the continuous detection type logarithmic amplifier, and the output end of the singlechip is connected with the amplitude adjustable amplifier.
9. An adaptive temperature-compensated true logarithmic amplifier according to claim 8, wherein said adaptive temperature controller temperature compensates said continuous-detection logarithmic amplifier by collecting logarithmic output information and self-temperature sensor information.
CN202310503750.XA 2023-05-06 2023-05-06 True logarithmic amplifier with self-adaptive temperature compensation Pending CN116545391A (en)

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CN202310503750.XA CN116545391A (en) 2023-05-06 2023-05-06 True logarithmic amplifier with self-adaptive temperature compensation

Applications Claiming Priority (1)

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CN116545391A true CN116545391A (en) 2023-08-04

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