Simulation temperature compensation circuit and simulation method for ensuring high and low temperature consistency of attenuator

Abstract

The invention provides a simulation temperature compensation circuit and simulation method for ensuring high and low temperature consistency of an attenuator, the positive electrode of a power supply VDC is respectively connected with one end of a resistor R27 and one end of a resistor R28, the other end of the resistor R27 and the other end of the resistor R28 are respectively connected with one end of a resistor R29, and the other end of the resistor R29 is connected with the positive electrode input end of an operational amplifier. And a simulation model is established, the simulation model comprises a low-temperature simulation circuit, a normal-temperature simulation circuit and a high-temperature simulation circuit, and the low-temperature simulation circuit, the normal-temperature simulation circuit and the high-temperature simulation circuit all adopt simulation temperature compensation circuits for ensuring the consistency of high temperature and low temperature of the attenuator. The problem that gain stability cannot be achieved through a set of temperature compensation voltages due to the fact that gain changes are in two-dimensional correlation with the temperature and the bias voltage state in different attenuation states is solved, after the temperature phase compensation circuit is applied, bias voltage compensation factors are overlaid under different attenuation states, bias voltage is compensated in different attenuation states, and the stability of the gain is improved. The problem that different attenuation states change along with the temperature is solved to a large extent.

Description

Technical Field

[0001] The invention belongs to the technical field of amplifiers, relates to a space traveling wave tube amplifier, and specifically relates to an analog temperature compensation circuit and a simulation method for ensuring high and low temperature consistency of an attenuator. Background Art

[0002] like Figure 1 As shown in the figure, the spatial linearized traveling wave tube amplifier (hereinafter referred to as linearized traveling wave tube amplifier) ​​product consists of three parts: traveling wave tube (TWT), traveling wave tube power supply (EPC) and linearized channel amplifier (LCAMP). Its main function is to amplify the power of the microwave transmission signal downlinked from the satellite.

[0003] The traveling wave tube amplifier has the following functions: receiving the primary power supply output by the entire satellite and generating various voltages required for the pulse amplifier; receiving and executing the on and off remote control commands output by the entire satellite; receiving the RF signal output by the inverter, performing gain control and temperature compensation, linearizing the traveling wave tube, and improving the linearity of the entire amplifier; completing the saturated power amplification of the RF signal and outputting it to the antenna; generating various telemetry information required by the entire satellite and outputting it to the system.

[0004] In addition to achieving high power output, the traveling wave tube amplifier also needs to perform gain control and temperature compensation throughout the RF chain. The FGM gain position control and adjustment range is greater than 25dB, and the gain position control and adjustment range in ALC mode is greater than 13dB.

[0005] Space linearized traveling wave tube amplifiers account for more than 75% of space traveling wave tube amplifiers and are widely used in communications, remote sensing, and navigation satellites. The demand for a single satellite reaches dozens of units. In addition to high requirements for the electrical performance of the product, the temperature stability of the product under large dynamic gain adjustment (attenuation change) is also required to ensure the stability of the working state of the communication system. Summary of the invention

[0006] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an analog temperature compensation circuit and simulation method for ensuring the high and low temperature consistency of the attenuator, so as to solve the technical problem in the prior art that the attenuator changes differently with temperature in different attenuation states.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] An analog temperature compensation circuit for ensuring the high and low temperature consistency of an attenuator includes a power supply V_DC, wherein the negative electrode of the power supply V_DC is grounded, the positive electrode of the power supply V_DC is respectively connected to one end of a resistor R27 and one end of a resistor R28, the other end of the resistor R27 and the other end of the resistor R28 are respectively connected to one end of a resistor R29, the other end of the resistor R29 is connected to the positive input end of an operational amplifier, the positive input end of the operational amplifier is also linked to one end of a resistor R35, and the other end of the resistor R35 is grounded.

[0009] The negative input terminal of the operational amplifier is connected to one end of the resistor R36, the other end of the resistor R36 is respectively connected to one end of the resistor R37 and one end of the resistor R38, and the other end of the resistor R37 and the other end of the resistor R38 are respectively grounded.

[0010] The negative input terminal of the operational amplifier is also connected to one end of the resistor R32, the other end of the resistor R32 is connected to the output terminal of the operational amplifier, the output terminal of the operational amplifier is also connected to one end of the resistor R33, one end of the resistor R33 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is grounded.

[0011] The present invention also has the following technical features:

[0012] Specifically, the voltage corresponding to the power supply V_DC is the gear voltage.

[0013] Specifically, the resistor R27 and the resistor R38 are both thermistors with equal resistance.

[0014] The resistor R29 and the resistor R36 are both matching resistors with equal resistance values.

[0015] The resistor R28 and the resistor R37 are both matching resistors with equal resistance values.

[0016] Preferably, the attenuator is a spatially linearized traveling wave tube amplifier.

[0017] The present invention also protects a simulation method for ensuring high and low temperature consistency of an attenuator, the method comprising the following steps:

[0018] Step 1. The method uses ADS simulation software to establish a simulation model. The simulation model includes a low-temperature simulation circuit, a normal-temperature simulation circuit and a high-temperature simulation circuit. The low-temperature simulation circuit, the normal-temperature simulation circuit and the high-temperature simulation circuit all use the analog temperature compensation circuit as described in claim 3 to ensure the high and low temperature consistency of the attenuator.

[0019] Step 2: Let G1 represent the difference between the target value and the output value of the low-temperature simulation circuit, G2 represent the difference between the target value and the output value of the normal-temperature simulation circuit, and G3 represent the difference between the target value and the output value of the high-temperature simulation circuit, and establish an optimization model.

[0020] Step 3: Test the attenuator’s lowest attenuation state and high attenuation state voltages, and record them as V 0 and V 25 .

[0021] Step 4: Test the gain fluctuation of the high-gain gear voltage of the attenuator under high temperature and low temperature conditions, adjust the high-temperature gear voltage so that the gain value of the high-temperature gear voltage is consistent with the gain value of the normal temperature gear voltage, and record the voltage value as V 25H ; Adjust the low temperature gear voltage to make the gain value of the low temperature gear voltage consistent with the gain value of the normal temperature gear voltage, and record the voltage value as V 25L .

[0022] Step 5: In the ADS simulation software, set the required voltage value V_low of the low temperature simulation circuit to V 25L , the required voltage value of the normal temperature simulation circuit is V_normal=V 25 , the required voltage value of the high temperature simulation circuit is V_high=V 25H .

[0023] Step six, based on the optimization mode in step two and the set voltage in step five, simulation optimization is performed in ADS simulation software to directly obtain the resistance values ​​R2 and R3 of the matching resistors.

[0024] Step seven, replacing the resistance values ​​R2 and R3 of the matching resistors with the matching resistors in the simulation model, and thus obtaining an optimized simulation model.

[0025] Specifically, in step 1, the low temperature is greater than or equal to -15°C and less than 0°C; the normal temperature is greater than or equal to 0°C and less than or equal to 25°C; the high temperature is greater than or equal to 25°C and less than or equal to 65°C.

[0026] Preferably, in step 1, the low temperature is -15°C; the normal temperature is 25°C; and the high temperature is 65°C.

[0027] Specifically, in step seven, the resistor R29 and the resistor R36 are both matching resistors with a resistance value of R2; the resistor R28 and the resistor R37 are both matching resistors with a resistance value of R3.

[0028] Compared with the prior art, the present invention has the following technical effects:

[0029] (I) The present invention proposes a simple and efficient analog temperature compensation circuit suitable for stabilizing the attenuation value of a large dynamic attenuation attenuator, which solves the problem that the gain change is two-dimensionally related to the temperature and bias state under different attenuation states, and the gain stability cannot be achieved through a set of temperature compensation voltages. After applying this temperature phase compensation circuit, the bias compensation factor is superimposed under different attenuations, and the bias is compensated under different attenuation states, which largely suppresses the problem that different attenuation states change with temperature.

[0030] (II) The analog temperature compensation circuit of the present invention has a simple structure and is easy to implement.

[0031] (III) The simulation method of the present invention has strong adjustability. It only needs to change the slope of the temperature-dependent resistor to effectively adjust the slope of the phase temperature compensation circuit, thereby adapting to the temperature gain change requirements of different attenuation states.

[0032] (IV) The simulation circuit in the simulation method of the present invention can automatically output the matching resistance value. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a block diagram of the RF chain of a spatially linearized traveling wave tube amplifier.

[0034] Figure 2 This is a schematic diagram showing how the gain of a spatially linearized traveling wave tube amplifier changes with voltage.

[0035] Figure 3 This is a schematic diagram of the gain variation with temperature in different attenuation states of a single-space linearized traveling wave tube amplifier.

[0036] Figure 4 It is a schematic diagram of an analog temperature compensation circuit that ensures the high and low temperature consistency of the attenuator.

[0037] FIG5( a ) is a diagram showing the voltage compensation result at the default gear position.

[0038] Figure 5(b) is the maximum gear voltage compensation result diagram.

[0039] Figure 6 It is a schematic diagram of the simulation model.

[0040] Figure 7 is a schematic diagram of the optimization settings.

[0041] Figure 8 It is a schematic diagram for defining the required voltage value and matching resistance for automatic output.

[0042] Fig. 9 This is a schematic diagram of the result output.

[0043] Fig.10 It is a schematic diagram of the phase balancing compensation principle.

[0044] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0045] It should be noted that, unless otherwise specified, all components and software in the present invention are components and software known in the prior art.

[0046] In the present invention, the low temperature is greater than or equal to -15°C and less than 0°C; the normal temperature is greater than or equal to 0°C and less than or equal to 25°C; the high temperature is greater than or equal to 25°C and less than or equal to 65°C.

[0047] The microwave devices in the microwave hybrid integrated circuit (MHIC) of the spatial linearized traveling wave tube amplifier will drift in gain under different temperature conditions. In order to meet the requirements for the stability of the overall gain at different temperatures, it is necessary to compensate the gain of the spatial linearized traveling wave tube amplifier according to the changes in the temperature range. The gain compensation method is to change the bias voltage of the electrically adjustable attenuator set inside the RF channel to achieve the opposite trend of the attenuation and the overall gain under temperature, thereby achieving gain compensation and ensuring the stability of the overall gain under temperature.

[0048] Since the spatial linearized traveling wave tube amplifier requires large dynamic adjustment of the gain level, the default working level is level 0 and the maximum working level is level 25, and the gain variation is greater than 25dB. Figure 2 and Figure 3 The changes of the spatial linearized traveling wave tube amplifier under different attenuation states and different temperatures after large dynamic adjustment of the gain level are given. When the single attenuation state is 3dB attenuation, the high and low temperature change is ±0.3dB, and when the single attenuation state is 15dB, the high and low temperature change is ±1.5dB.

[0049] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0050] Embodiment 1:

[0051] This embodiment provides an analog temperature compensation circuit to ensure the high and low temperature consistency of the attenuator. Figure 4 As shown, it includes a power supply V_DC, the negative electrode of the power supply V_DC is grounded, the positive electrode of the power supply V_DC is respectively connected to one end of the resistor R27 and one end of the resistor R28, the other end of the resistor R27 and the other end of the resistor R28 are respectively connected to one end of the resistor R29, the other end of the resistor R29 is connected to the positive input terminal of the operational amplifier, the positive input terminal of the operational amplifier is also linked to one end of the resistor R35, and the other end of the resistor R35 is grounded.

[0052] like Figure 4 As shown, the negative input terminal of the operational amplifier is connected to one end of the resistor R36, the other end of the resistor R36 is respectively connected to one end of the resistor R37 and one end of the resistor R38, and the other end of the resistor R37 and the other end of the resistor R38 are grounded respectively.

[0053] like Figure 4 As shown, the negative input terminal of the operational amplifier is also connected to one end of the resistor R32, the other end of the resistor R32 is connected to the output terminal of the operational amplifier, the output terminal of the operational amplifier is also connected to one end of the resistor R33, one end of the resistor R33 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is grounded.

[0054] like Figure 4 As shown, the voltage corresponding to the power supply V_DC is the gear voltage.

[0055] like Figure 4 As shown, the resistor R27 and the resistor R38 are both thermistors with equal resistance.

[0056] like Figure 4 As shown, the resistor R29 and the resistor R36 are both matching resistors with equal resistance values.

[0057] like Figure 4 As shown, the resistor R28 and the resistor R37 are both equal matching resistors.

[0058] As a preferred solution of this embodiment, the attenuator is a spatial linear traveling wave tube amplifier.

[0059] In this embodiment, Figure 4 As shown, the resistor R27, the resistor R38, the resistor R28 and the resistor R37 together constitute the gear voltage temperature compensation factor.

[0060] In this embodiment, the gain temperature change rate of different gears is different, and the temperature compensation circuit must have good adjustability to adapt to the application requirements of different gear voltages. The analog temperature compensation circuit for ensuring the high and low temperature consistency of the attenuator provided in this embodiment can achieve different gear voltage compensation results, as shown in Figure 5 (a) and Figure 5 (b).

[0061] Embodiment 2:

[0062] This embodiment provides a simulation method for ensuring high and low temperature consistency of an attenuator, the method comprising the following steps:

[0063] Step 1, such as Figure 6As shown, the method uses ADS (Advanced Design System) simulation software to establish a simulation model, and the simulation model includes a low-temperature simulation circuit, a normal-temperature simulation circuit, and a high-temperature simulation circuit. The low-temperature simulation circuit, the normal-temperature simulation circuit, and the high-temperature simulation circuit all use the analog temperature compensation circuit given in Example 1 to ensure the high and low temperature consistency of the attenuator.

[0064] In this embodiment, the low temperature is -15°C; the normal temperature is 25°C; and the high temperature is 65°C.

[0065] In this embodiment, Figure 6 As shown, the resistance values ​​of the thermistors in the low temperature simulation circuit are all low temperature resistance values ​​RT1; the resistance values ​​of the thermistors in the normal temperature simulation circuit are all normal temperature resistance values ​​RT2; and the resistance values ​​of the thermistors in the high temperature simulation circuit are all high temperature resistance values ​​RT3.

[0066] In this embodiment, Figure 6 As shown, the output voltage in the low temperature simulation circuit is the low temperature output voltage Vout1; the output voltage in the normal temperature simulation circuit is the normal temperature output voltage Vout2; and the output voltage in the high temperature simulation circuit is the high temperature output voltage Vout3.

[0067] Step 2, such as Figure 7 As shown, let G1 represent the difference between the target value and the output value of the low-temperature simulation circuit, G2 represent the difference between the target value and the output value of the normal-temperature simulation circuit, and G3 represent the difference between the target value and the output value of the high-temperature simulation circuit, and establish an optimization model.

[0068] Step 3: Test the attenuator’s lowest attenuation state and high attenuation state voltages, and record them as V 0 and V 25 .

[0069] Step 4: Test the gain fluctuation of the attenuator high gain gear voltage under high temperature and low temperature conditions, adjust the high temperature gear voltage so that the gain value of the high temperature gear voltage is consistent with the gain value of the normal temperature gear voltage, and record the voltage value as V 25H ; Adjust the low temperature gear voltage to make the gain value of the low temperature gear voltage consistent with the gain value of the normal temperature gear voltage, and record the voltage value as V 25L .

[0070] Step 5: In the ADS simulation software, Figure 8 As shown, the required voltage value V_low of the low temperature simulation circuit is set to V 25L , the required voltage value of the normal temperature simulation circuit is V_normal=V 25 , the required voltage value of the high temperature simulation circuit is V_high=V 25H .

[0071] Step 6: Based on the optimization mode in step 2 and the set voltage in step 5, simulation optimization is performed in ADS simulation software, such as Fig. 9 As shown, the resistance values ​​of the matching resistors R2 and R3 are directly obtained.

[0072] Step seven, replace the resistance values ​​R2 and R3 of the matching resistors with the matching resistors in the simulation model to obtain the optimized simulation model.

[0073] Specifically, the resistor R29 and the resistor R36 are both matching resistors with a resistance value of R2.

[0074] Specifically, the resistor R28 and the resistor R37 are both matching resistors with a resistance value of R3.

[0075] Specifically, in this embodiment, the optimized simulation model can perform temperature compensation on the spatial linear traveling wave tube amplifier, thereby ensuring the high and low temperature consistency of the spatial linear traveling wave tube amplifier.

[0076] Specifically, in this embodiment, the simulation method of the present invention is applied to a spatial linear traveling wave tube amplifier. When the default working gear is gear 0, before use, the high and low temperature change of the 3dB attenuation state is ±0.3dB, and the high and low temperature change of the 25dB attenuation state is ±2.9dB. After use, Fig.10 As shown, phase balance compensation is performed, and the high and low temperature changes of all attenuation states are ±0.3dB.

Claims

1. An analog temperature compensation circuit for ensuring high and low temperature consistency of an attenuator, characterized in that: A power supply V_DC is included, wherein the negative electrode of the power supply V_DC is grounded, the positive electrode of the power supply V_DC is respectively connected to one end of a resistor R27 and one end of a resistor R28, the other end of the resistor R27 and the other end of the resistor R28 are respectively connected to one end of a resistor R29, the other end of the resistor R29 is connected to the positive input end of an operational amplifier, the positive input end of the operational amplifier is also connected to one end of a resistor R35, and the other end of the resistor R35 is grounded; The negative input terminal of the operational amplifier is connected to one end of the resistor R36, the other end of the resistor R36 is connected to one end of the resistor R37 and one end of the resistor R38, the other end of the resistor R37 and the other end of the resistor R38 are grounded respectively; The negative input terminal of the operational amplifier is also connected to one end of the resistor R32, the other end of the resistor R32 is connected to the output terminal of the operational amplifier, the output terminal of the operational amplifier is also connected to one end of the resistor R33, one end of the resistor R33 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is grounded.

2. The analog temperature compensation circuit for ensuring high and low temperature consistency of the attenuator as claimed in claim 1, characterized in that: The voltage corresponding to the power supply V_DC is the gear voltage.

3. The analog temperature compensation circuit for ensuring high and low temperature consistency of the attenuator as claimed in claim 1, characterized in that: The resistor R27 and the resistor R38 are both thermistors with equal resistance values; The resistor R29 and the resistor R36 are both matching resistors with equal resistance values; The resistor R28 and the resistor R37 are both matching resistors with equal resistance values.

4. The analog temperature compensation circuit for ensuring high and low temperature consistency of the attenuator as claimed in claim 3, characterized in that: The attenuator is a spatial linearized traveling wave tube amplifier.

5. A simulation method for ensuring high and low temperature consistency of an attenuator, characterized in that: The method comprises the following steps: Step 1, the method uses ADS simulation software to establish a simulation model, the simulation model includes a low-temperature simulation circuit, a normal-temperature simulation circuit and a high-temperature simulation circuit, and the low-temperature simulation circuit, the normal-temperature simulation circuit and the high-temperature simulation circuit all use the analog temperature compensation circuit for ensuring the high and low temperature consistency of the attenuator as claimed in claim 3; Step 2: Set G1 to represent the difference between the target value and the output value of the low-temperature simulation circuit, G2 to represent the difference between the target value and the output value of the normal-temperature simulation circuit, and G3 to represent the difference between the target value and the output value of the high-temperature simulation circuit, and establish an optimization model; Step 3: Test the attenuator’s lowest attenuation state and high attenuation state voltages, and record them as V0 and V 25 ; Step 4: Test the gain fluctuation of the high-gain gear voltage of the attenuator under high temperature and low temperature conditions, adjust the high-temperature gear voltage so that the gain value of the high-temperature gear voltage is consistent with the gain value of the normal temperature gear voltage, and record the voltage value as V 25H ; Adjust the low temperature gear voltage to make the gain value of the low temperature gear voltage consistent with the gain value of the normal temperature gear voltage, and record the voltage value as V 25L ; Step 5: In the ADS simulation software, set the required voltage value V_low of the low temperature simulation circuit to V 25L , the required voltage value of the normal temperature simulation circuit is V_normal=V 25 , the required voltage value of the high temperature simulation circuit is V_high=V 25H ; Step 6: Based on the optimization mode in step 2 and the set voltage in step 5, simulation optimization is performed in ADS simulation software to directly obtain the resistance values ​​R2 and R3 of the matching resistors; Step seven, replacing the resistance values ​​R2 and R3 of the matching resistors with the matching resistors in the simulation model, and thus obtaining an optimized simulation model.

6. The simulation method for ensuring high and low temperature consistency of the attenuator as claimed in claim 5, characterized in that: In step 1, the low temperature is greater than or equal to -15°C and less than 0°C; the normal temperature is greater than or equal to 0°C and less than or equal to 25°C; the high temperature is greater than or equal to 25°C and less than or equal to 65°C.

7. The simulation method for ensuring high and low temperature consistency of the attenuator as claimed in claim 6, characterized in that: In step 1, the low temperature is -15°C; the normal temperature is 25°C; and the high temperature is 65°C.

8. The simulation method for ensuring high and low temperature consistency of an attenuator as claimed in claim 5, characterized in that: In step seven, the resistor R29 and the resistor R36 are both matching resistors with a resistance value of R2; the resistor R28 and the resistor R37 are both matching resistors with a resistance value of R3.

9. The simulation method for ensuring high and low temperature consistency of an attenuator as claimed in claim 5, characterized in that: The attenuator is a spatial linearized traveling wave tube amplifier.

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