Chip remote control and telemetering circuit

Abstract

In order to overcome the defect that the gain and local oscillation frequency of a frequency converter of a microwave receiver are non-adjustable, a gain gear remote control circuit and a gain gear state telemetering circuit are embedded under the condition that the size of a radio frequency module is not changed, and the gain gear remote control circuit and the gain gear state telemetering circuit are embedded under the condition that the size of a local oscillation module is not changed. And a local oscillator frequency switching remote control circuit and a frequency state telemetering circuit are embedded. The receiver frequency converter is ensured to have the functions of local oscillation adjustability and gain adjustability, and the construction specifications of spacecrafts are met. Meanwhile, the sizes of the radio frequency module and the local oscillator module and the size and the weight of the whole frequency converter of the microwave receiver are not changed, so that miniaturization, light weight and function complication of the frequency converter are realized. The chip multifunctional telemetering interface circuit belongs to universal design, can be used for microwave receiver frequency converters with the same requirements, and is suitable for industrial large-scale use and popularization.

Description

Technical Field

[0001] The invention belongs to the field of digital-analog hybrid circuits, and in particular relates to a chip-based remote control and telemetry circuit. Background Art

[0002] With the development of aerospace technology, the working range of spacecraft has gradually expanded from Earth orbit to Earth-Moon orbit and Mars orbit. Spacecraft has continuously improved the miniaturization, lightness and functional complexity of payloads. As a widely used payload equipment in spacecraft, microwave receiver converters have more stringent requirements for miniaturization, lightness and functional complexity.

[0003] The latest generation of microwave receiver frequency converters have been miniaturized and lightweight in terms of volume and mass, but the electrical performance is relatively simple, and the gain and local oscillator frequency cannot be adjusted. How to adapt to the higher requirements of current spacecraft for microwave receiver frequency converters by having adjustable gain, variable local oscillator frequency and state telemetry without changing the weight and size of the current microwave receiver frequency converter is of great practical significance. Summary of the invention

[0004] The object of the present invention is to provide a chip-based remote control and telemetry circuit to solve the problem that the devices in the prior art do not have the functions of adjustable gain, variable local oscillator frequency and state telemetry.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] A chip-based remote control and telemetry circuit includes an optocoupler circuit, a counter chip U2, a data attenuator U3, a driver chip U4, a digital-to-analog converter chip U5, a proportional amplifier circuit and a telemetry interface circuit;

[0007] The counter chip U2 is connected to the optocoupler circuit, the driver chip U4 and the digital-to-analog converter chip U5 respectively;

[0008] The driver chip U4 is also connected to the data attenuator U3;

[0009] The digital-to-analog converter chip U5 is connected to a proportional amplifier circuit, and the proportional amplifier circuit is also connected to a telemetry interface circuit.

[0010] The present invention also has the following features:

[0011] Furthermore, the model of the counter chip U2 is NC2218-1C-K;

[0012] The UP terminal and DOWN terminal of the counter chip U2 are respectively connected to the optocoupler circuit;

[0013] The D1, D2, D3, D4 and D5 terminals of the counter chip U2 are respectively connected to corresponding TTL levels;

[0014] The VCC terminal of the counter chip U2 is connected to an external power supply;

[0015] The GND terminal of the counter chip U2 is grounded;

[0016] The CH terminal of the counter chip U2 is externally connected to the corresponding TTL level;

[0017] The LD terminal of the counter chip U2 is left hanging;

[0018] The Q1, Q2, Q3, Q4, and Q5 terminals of the counter chip U2 are connected to the digital-to-analog converter chip U5 and the driver chip U4, respectively.

[0019] Furthermore, the model of the driver chip U4 is NC2206-1C-K;

[0020] The model of the data attenuator U3 is NC1315C-108A;

[0021] The model of the digital-to-analog converter chip U5 is GDA08SPH1;

[0022] The Q1 terminal of the counter chip U2, the A2 terminal of the driver chip U4, and the DB2 terminal of the digital-to-analog converter chip U5 are connected together;

[0023] The Q2 terminal of the counter chip U2, the A3 terminal of the driver chip U4, and the DB3 terminal of the digital-to-analog converter chip U5 are connected together;

[0024] The Q3 terminal of the counter chip U2, the A4 terminal of the driver chip U4, and the DB4 terminal of the digital-to-analog converter chip U5 are connected together;

[0025] The Q4 terminal of the counter chip U2, the A5 terminal of the driver chip U4, and the DB5 terminal of the digital-to-analog converter chip U5 are connected together;

[0026] The Q5 terminal of the counter chip U2, the A6 terminal of the driver chip U4, and the DB6 terminal of the digital-to-analog converter chip U5 are connected together;

[0027] The 1B and 2B terminals of the driver chip U4 are suspended; the A1 terminal of the driver chip U4 is grounded;

[0028] The 1A, 2A, 3A, 3B, 4A, 4B, 5A, 5B, 6A, and 6B terminals of the driver chip U4 are connected to the V1, V2, V3, V4, V5, V6, V7, V8, V9, and V10 terminals of the data attenuator U3 in a one-to-one correspondence;

[0029] The DB7 terminal of the digital-to-analog converter chip U5 is grounded, and the DB1 and DB0 terminals of the digital-to-analog converter chip U5 are grounded together;

[0030] The GND, CS-, and CE- terminals of the digital-to-analog converter chip U5 are grounded together;

[0031] The VCC terminal of the digital-to-analog converter chip U5 is connected to an external power supply;

[0032] The VO chip UT, VO chip UTM and VO chip UTS ends of the digital-to-analog converter chip U5 are connected to one point, and the end point is connected to the proportional amplification circuit.

[0033] Furthermore, the optocoupler circuit includes a first optocoupler circuit and a second optocoupler circuit having the same structure;

[0034] The first optical coupling circuit includes a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and an optical coupler OC1;

[0035] The anode of the diode D1 is connected to the command input line; the cathode of the diode D1 is connected to one end of the resistor R1 and one end of the resistor R2;

[0036] The other end of the resistor R1 is commonly connected to one end of the capacitor C1, one end of the resistor R3 and the first end of the optical coupler OC1;

[0037] The other end of the resistor R2 is connected to the command loop, the other end of the capacitor C1 and the anode of the diode D2; the cathode of the diode D2 is connected to the other end of the resistor R3 and the second end of the optical coupler OC1;

[0038] The third ends of the optical couplers OC1 of the first optical coupler circuit and the second optical coupler circuit are respectively connected to an external power supply;

[0039] The fourth end of the optical coupler OC1 of the first optical coupler circuit is connected to the chip UP end of the counter chip U2 , and the fourth end of the optical coupler OC1 of the second optical coupler circuit is connected to the DOWN end of the counter chip U2 .

[0040] Furthermore, the proportional amplification circuit includes a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C2, a diode D3 and an operational amplifier chip U1;

[0041] One end of the resistor R4 is grounded, and the other end of the resistor R4 is connected to one end of the resistor R5 and the 1-pin of the operational amplifier chip U1;

[0042] The other end of the resistor R5, the 10 chip UT end of the operational amplifier chip U1, one end of the capacitor C2, one end of the resistor R6, the cathode of the diode D3 and one end of the resistor R7 are connected; the other end of the resistor R7 is connected to the telemetry interface circuit;

[0043] The other end of the capacitor C2, the other end of the resistor R6 and the positive electrode of the diode D3 are grounded together;

[0044] The 1+ terminal of the operational amplifier chip U1 is connected to the VO chip UT, VO chip UTM, and VO chip UTS terminals of the digital-to-analog converter chip U5 through the resistor R8;

[0045] The GND terminal of the operational amplifier chip U1 is grounded;

[0046] The VCC terminal of the operational amplifier chip U1 is connected to an external power supply;

[0047] The 2O chip UT terminal, 2- terminal and 2+ terminal of the operational amplifier chip U1 are suspended.

[0048] Compared with the prior art, the present invention has the following technical effects:

[0049] In order to overcome the shortcoming that the gain and local oscillator frequency of the microwave receiver frequency converter cannot be adjusted, the chip-based remote control and telemetry circuit of the present invention embeds a gain gear remote control circuit and a gain gear state telemetry circuit while the size of the radio frequency module remains unchanged, and embeds a local oscillator frequency switching remote control circuit and a frequency state telemetry circuit while the size of the local oscillator module remains unchanged. It not only ensures that the receiver frequency converter has the functions of adjustable local oscillator and adjustable gain, but also meets the construction specifications of spacecraft. At the same time, due to the size of the radio frequency module and the local oscillator module, the size and weight of the entire microwave receiver frequency converter remain unchanged, achieving its miniaturization, lightweight, and complex functions. The chip-based multifunctional telemetry interface circuit is a universal design, which can be used for microwave receiver frequency converters with the same requirements, and is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the overall structure of the chip-based remote control and telemetry circuit of the present invention;

[0051] Figure 2 It is a connection circuit diagram of the counter chip U2, the data attenuator U3, the driver chip U4 and the digital-to-analog converter chip U5 in the present invention;

[0052] Figure 3 is the first optocoupler circuit diagram of the present invention;

[0053] Figure 4 It is the proportional amplification circuit and telemetry interface circuit diagram of the present invention;

[0054] Figure 5 It is a double-sided assembly diagram of a telemetry interface circuit in one embodiment of the present invention.

[0055] The meanings of the labels in the figure are: 1. Gain plus command remote control circuit; 2. Gain minus command remote control circuit; 3. Multi-mode counter; 4. Digital-to-analog converter; 5. Proportional amplification telemetry interface circuit. DETAILED DESCRIPTION

[0056] It should be noted that all components in the present invention, unless otherwise specified, are components known in the prior art. For example, the telemetry interface circuit is a known existing telemetry interface circuit, and the gain plus command remote control circuit, gain minus command remote control circuit, multi-mode counter, digital-to-analog converter and proportional amplification telemetry interface circuit in the circuit all adopt known existing circuit forms; the connection relationship between the telemetry interface circuit and the corresponding circuit is also a known existing connection relationship.

[0057] 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.

[0058] like Figure 1 As shown, a chip-based remote control and telemetry circuit includes an optocoupler circuit, a counter chip U2, a data attenuator U3, a driver chip U4, a digital-to-analog converter chip U5, a proportional amplifier circuit and a telemetry interface circuit;

[0059] The counter chip U2 is connected to the optocoupler circuit, the driver chip U4 and the digital-to-analog converter chip U5 respectively;

[0060] The driver chip U4 is also connected to the data attenuator U3;

[0061] The digital-to-analog converter chip U5 is connected to the proportional amplifier circuit, and the proportional amplifier circuit is connected to the telemetry interface circuit.

[0062] The function of the optocoupler circuit is to convert the external input discrete command control signal into photoelectric conversion. It has the characteristics of anti-amplitude and anti-interference, isolation and protection of the subsequent circuit, and at the same time meets the input impedance requirements of the satellite construction specifications (normally ≧5KΩ).

[0063] The counter chip is the core device of the entire telemetry interface circuit. The counter chip has a built-in 0-32 multi-mode counter. The module value of the counter can be set by giving the levels of the five pressure points D5, D4, D3, D2, and D1. The counter can count in both directions: adding counts (chip UP) and subtracting counts (DOWN). The input counting pulse is TTL level. At the falling edge of the counting pulse, the output states of the counter (Q1-Q5) change regularly, and the output signal is 8421 code of TTL level.

[0064] The parallel FET driver chip can generate a -5V / 0V complementary pulse signal output from the input TTL pulse signal. Each driver inside the chip works separately without interfering with each other. The digital attenuator chip is a component of the RF link. Its main function is to achieve different levels of attenuation according to the external -5V / 0V complementary pulse TTL signal, thereby completing the switching function of the gain level of the entire RF chain.

[0065] The digital-to-analog conversion electrical chip converts the binary 8421 code digital signal output by the counter chip U2 into an analog voltage value. The chip has multiple working modes. When Vcc=+5V, the output voltage range is 0V~2.56V, and when Vcc=+15V, the output voltage range is 0~+10V. The working mode can be selected according to the needs.

[0066] The proportional amplifier circuit is composed of an operational amplifier chip and multiple resistors. Its function is to convert the input voltage to the required output level range through reasonable resistor parameter selection. The main function of the telemetry interface circuit is to prevent the reverse injection of interference signals, which may cause abnormal circuit operation. At the same time, it is to prevent the remote control and telemetry voltage from exceeding a certain voltage value under fault conditions and affecting the subsequent telemetry equipment. At the same time, it meets the output impedance requirements of the satellite construction specifications (normally ≦5KΩ).

[0067] The circuit is functionally divided into a remote control circuit and a telemetry circuit. The specific working principle of the remote control circuit is as follows: the external platform provides a discrete instruction (addition instruction or subtraction instruction) of a pulse voltage, which is connected to the "addition count" or "subtraction count" port of the counter chip U2 through an optocoupler circuit. The counter chip U2 sets the modulus value (D1~D5) according to the task requirements, and realizes the regular change of the output modulus value (Q1~Q5) through the "addition count" or "subtraction count" pulse signal, with two modes of modulus value cycle counting or hold counting. For the gain remote control circuit, the output end of the counter chip U2 is connected to the parallel driver, and the output end of the driver is connected to the digital attenuator to complete the function of controlling the gain gear switching of the entire RF link. For the frequency remote control circuit, the output end of the counter chip U2 is connected to the data selector, and the output of the data selector is connected to the M-position port of the local oscillator frequency phase detector, thereby controlling the function of switching the local oscillator frequency.

[0068] The specific working principle of the telemetry circuit is: the digital signal (8421 code) output by the counter chip U2 is converted into an analog voltage signal through the digital-to-analog converter chip, and then enters the proportional amplifier circuit to amplify the voltage, so as to achieve the function of representing different analog voltage values ​​corresponding to different gear states. The telemetry interface circuit is set up, and finally output to the platform for collection.

[0069] The multi-mode counter chip U2 is matched with the flexible design of parallel driver or data selector to realize the function of gain adjustment or local oscillator frequency adjustment. This control method does not require software configuration, and only discrete pulse instructions are required to implement the adjustment function. The output port of the counter chip U2 is reasonably matched with the input port of the digital-to-analog converter to convert the output digital signal (8421 code) into an analog voltage signal. The parameter values ​​are reasonably set according to the task requirements to realize the different requirements of different platforms for the telemetry voltage range.

[0070] The chip-based remote control and telemetry circuit is integrated into the RF module and local oscillator module of the microwave receiver inverter using a multi-layer board + bare chip + micro-assembly method. Without changing the size and weight of the module, it not only meets the needs of gain or local oscillator frequency gear switching remote control and telemetry, but also meets the spacecraft construction specifications.

[0071] like Figure 2 As shown, specifically, the model of the counter chip U2 is NC2218-1C-K;

[0072] Among them, the counter chip U2 can also use NC2218-1C.

[0073] The UP terminal and DOWN terminal of the counter chip U2 are respectively connected to the optocoupler circuit;

[0074] The D1, D2, D3, D4 and D5 terminals of the counter chip U2 are respectively connected to corresponding TTL levels;

[0075] The VCC terminal of the counter chip U2 is connected to the external power supply;

[0076] The GND terminal of the counter chip U2 is grounded;

[0077] The CH terminal of the counter chip U2 is externally connected to the corresponding TTL level;

[0078] Among them, the connections of the D1 terminal, D2 terminal, D3 terminal, D4 terminal, D5 terminal and CH terminal of the counter chip U2 are not limited to those shown in the figure. Those skilled in the art can connect the corresponding ports to high level, low level or ground according to actual needs.

[0079] The LD terminal of the counter chip U2 is left floating;

[0080] The Q1, Q2, Q3, Q4, and Q5 terminals of the counter chip U2 are connected to the digital-to-analog converter chip U5 and the driver chip U4, respectively.

[0081] The Q1, Q2, Q3, Q4, and Q5 terminals of the counter chip U2 are connected to the digital-to-analog converter chip U5 and the driver chip U4, respectively.

[0082] Among them, RFin is the RF input signal, and RFout is the RF output signal.

[0083] Further, the model of the driver chip U4 is NC2206-1C-K;

[0084] The driver chip U4 may also adopt NC2206-1C.

[0085] The model of data attenuator U3 is NC1315C-108A;

[0086] The model of the digital-to-analog converter chip U5 is GDA08SPH1;

[0087] The Q1 terminal of the counter chip U2, the A2 terminal of the driver chip U4, and the DB2 terminal of the digital-to-analog converter chip U5 are connected together;

[0088] The Q2 terminal of the counter chip U2, the A3 terminal of the driver chip U4, and the DB3 terminal of the digital-to-analog converter chip U5 are connected together;

[0089] The Q3 terminal of the counter chip U2, the A4 terminal of the driver chip U4, and the DB4 terminal of the digital-to-analog converter chip U5 are connected together;

[0090] The Q4 terminal of the counter chip U2, the A5 terminal of the driver chip U4, and the DB5 terminal of the digital-to-analog converter chip U5 are connected together;

[0091] The Q5 terminal of the counter chip U2, the A6 terminal of the driver chip U4, and the DB6 terminal of the digital-to-analog converter chip U5 are connected together;

[0092] The 1B and 2B terminals of the driver chip U4 are suspended; the A1 terminal of the driver chip U4 is grounded;

[0093] The 1A, 2A, 3A, 3B, 4A, 4B, 5A, 5B, 6A, and 6B terminals of the driver chip U4 are connected to the V1, V2, V3, V4, V5, V6, V7, V8, V9, and V10 terminals of the data attenuator U3 in a one-to-one correspondence;

[0094] The DB7 terminal of the digital-to-analog converter chip U5 is grounded, and the DB1 and DB0 terminals of the digital-to-analog converter chip U5 are grounded together;

[0095] The GND, CS-, and CE- terminals of the digital-to-analog converter chip U5 are grounded together;

[0096] The VCC terminal of the digital-to-analog converter chip U5 is connected to an external power supply;

[0097] The VO chip UT, VO chip UTM, and VO chip UTS terminals of the digital-to-analog converter chip U5 are connected to one point, and the terminal is connected to the proportional amplifier circuit.

[0098] Furthermore, if Figure 3 As shown, the optocoupler circuit includes a first optocoupler circuit and a second optocoupler circuit with the same structure; the optocoupler is an anti-interference functional device, and the optocoupler device can effectively prevent malfunction problems caused by interference in a complex electromagnetic environment.

[0099] The first optical coupling circuit includes a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and an optical coupler OC1;

[0100] Among them, the model of diode D1 is 2CK6642X; the model of diode D2 is BZX55C3V3NJL;

[0101] The specifications of capacitor C1 of resistor R1, resistor R2, and resistor R3 are: 45KΩ, 3.9KΩ, 10KΩ, and 0.1UF respectively.

[0102] The model of the optical coupler OC1 is GH049.

[0103] The anode of diode D1 is connected to the command input line; the cathode of diode D1 is connected to one end of resistor R1 and one end of resistor R2;

[0104] The other end of the resistor R1 is commonly connected to one end of the capacitor C1, one end of the resistor R3 and the first end of the optical coupler OC1;

[0105] The other end of the resistor R2 is connected to the command loop, the other end of the capacitor C1 and the anode of the diode D2; the cathode of the diode D2 is connected to the other end of the resistor R3 and the second end of the optical coupler OC1;

[0106] The third ends of the optical couplers OC1 of the first optical coupler circuit and the second optical coupler circuit are respectively connected to an external power supply;

[0107] The fourth end of the optical coupler OC1 of the first optical coupling circuit is connected to the chip UP end of the counter chip U2 , and the fourth end of the optical coupler OC1 of the second optical coupling circuit is connected to the DOWN end of the counter chip U2 .

[0108] Furthermore, if Figure 4As shown, the proportional amplifier circuit includes a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C2, a diode D3 and an operational amplifier chip U1;

[0109] Among them, the specifications of resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, and capacitor C2 are: 1KΩ, 4.7KΩ, 4.7KΩ, 1KΩ, 100Ω, and 0.1 chip UF respectively.

[0110] The model of the diode D3 is BZX55C5V1NJL.

[0111] The model of the operational amplifier chip U1 is OP284.

[0112] One end of the resistor R4 is grounded, and the other end of the resistor R4 is connected to one end of the resistor R5 and the 1-pin of the operational amplifier chip U1;

[0113] The other end of the resistor R5, the 10 chip UT end of the operational amplifier chip U1, one end of the capacitor C2, one end of the resistor R6, the cathode of the diode D3 and one end of the resistor R7 are connected; the other end of the resistor R7 is connected to the telemetry interface circuit;

[0114] The other end of capacitor C2, the other end of resistor R6 and the positive electrode of diode D3 are grounded together;

[0115] The 1+ terminal of the operational amplifier chip U1 is connected to the VO chip UT, VO chip UTM, and VO chip UTS terminals of the digital-to-analog converter chip U5 through the resistor R8; the GND terminal of the operational amplifier chip U1 is grounded;

[0116] The VCC terminal of the operational amplifier chip U1 is connected to an external power supply;

[0117] The 2O chip UT terminal, 2- terminal and 2+ terminal of the operational amplifier chip U1 are left floating.

[0118] The proportional amplifier circuit is composed of an operational amplifier chip and multiple resistors. Its function is to convert the input voltage to the required output level range through reasonable resistor parameter selection. The main function of the telemetry interface circuit is to prevent the reverse injection of interference signals, which may cause abnormal circuit operation. At the same time, it is to prevent the remote control and telemetry voltage from exceeding a certain voltage value under fault conditions and affecting the subsequent telemetry equipment. At the same time, it meets the output impedance requirements of the satellite construction specifications (normally ≦5KΩ).

[0119] A specific implementation method is given below:

[0120] The working mode of the counter chip U2 is: before the chip is powered on, set the module value of the counter chip U2, for example, the module value is 20, that is, D5D4D3D2D1 = "10011". After powering on, the counter chip U2 chip U2 will automatically preset the set value of the initial value of the output terminal Q5Q4Q3Q2Q1 with the module value of D5D4D3D2D1. If you want to change the module value of the counter chip U2, you need to reset the module value of D5D4D3D2D1 after powering off and then power on. The counter chip U2 has two counting modes, the cyclic mode and the holding mode. When CH is at a high level, the counter chip U2 counts in a cyclic mode, that is, after counting to the maximum value (10011) or the minimum value (00000), if an increase count pulse (or a decrease count pulse) is issued again, the counter chip U2 will return to a zero value "000000" (or the maximum value). When CH is at a low level, the counter chip U2 counts in a hold mode, that is, after counting to the maximum value (10011) or the minimum value (00000), if an increase count pulse (or decrease count pulse) is sent again, the counter chip U2 will not act and the output action will be maintained.

[0121] Add count: When a pulse comes from the UP port of the chip, it increments once. When it increments to the maximum value of the selected module value, if the circular counting method is selected, the counter chip U2 returns to the minimum value "00000". If the hold counting method is selected, the counter chip U2 maintains the maximum output state. Decrease count: When a pulse comes from the DOWN port, it decrements once. When it decrements to the minimum value "00000" of the selected module value, if the circular counting method is selected, the counter chip U2 returns to the maximum value of the selected module value. If the counting method is selected, the counter chip U2 maintains the minimum output state.

[0122] In this example, the module value of the counter chip U2 is set to 26, that is, D5D4D3D2D1 = "11001". CH is in low-level hold mode. When a gain increase instruction is received from the platform, the transistor of the optocoupler is turned on, generating a pulse voltage of +4.5~+5V, and the emitter of the transistor is connected to the add count (chip UP) point of the multi-mode counter chip U2. Since the hold mode is selected, the output Q5Q4Q3Q2Q1 = "11001" remains unchanged. When a gain reduction instruction is received from the platform, the internal transistor of the optocoupler is connected to the multi-mode counter chip U2 (DOWN) point. At this time, the output Q5Q4Q3Q2Q1 = "11000". If a gain reduction instruction is sent again, Q5Q4Q3Q2Q1 = "10111", and so on. The Q5Q4Q3Q2Q1 output by the counter chip U2 is connected to the parallel FET driver, and the 5-bit Q5Q4Q3Q2Q1 is connected to the driver's A6A5A4A3A2. Since the task book requires a gain step of 1dB, the A1 voltage point of the driver is connected to a low level (0-0.2V), and this example is directly grounded. A6A5A4A3A2 changes with the change of Q5Q4Q3Q2Q1, and the 6-bit TTL level A6A5A4A3A2A1 is converted into a 12-bit -5V / 0V complementary pulse signal output by the driver, thereby controlling the attenuation value of the digital attenuator. The gain of the RF chain also changes with the gear position of the digital attenuator. The requirements of the gain gear addition and subtraction instructions are completed through the above steps.

[0123] The Q5Q4Q3Q2Q1 modulus value output by the counter chip U2 changes with the gain addition and subtraction instructions, and can also reflect the status of different gain gears. Using this point, the output port Q5Q4Q3Q2Q1 of the counter chip U2 is connected to the input port of the DA digital-to-analog converter chip. In this example, Q5Q4Q3Q2Q1 is connected to DB6DB5DB4DB3DB2 to convert the 5-bit digital signal into an analog signal. At this time, the output voltage of the digital-to-analog converter is between 0 and 0.8V. For the 26dB gain gear, the voltage difference between different gears is 0.027V, which is small and not easy to distinguish. The latter stage is connected to the proportional amplifier circuit, and the proportional coefficient is 1+R12 / R13. In this example, R13 is selected as 1KΩ and R12 is selected as 4.7KΩ. Therefore, the final output voltage is 0~4.6V, and the voltage difference between different gears is 0.18V, which meets the requirements of the task book for the total voltage range between 0~+5V and the voltage difference resolution ≧0.1V@1dB.

[0124] Spacecraft platforms usually require that the command loop be isolated from the primary bus loop, so the optocoupler circuit uses optocouplers to isolate the command loop from the primary bus loop of the platform during this process. When the command and the command loop are connected in reverse, the command input diode is reversely cut off, and the reverse voltage is applied to the diode. The reverse withstand voltage of the device is 100V, which can ensure the safety of the circuit when the command line is connected in reverse. The resistor value in the optocoupler circuit ensures that the input impedance is ≧5KΩ required in the construction specification.

[0125] The telemetry interface circuit is provided with a capacitor to prevent interference signals from being superimposed on the output telemetry interface circuit. At the same time, in order to prevent the telemetry voltage from being too high in a fault state and affecting the subsequent telemetry equipment, a protection circuit voltage regulator diode is also provided.

[0126] like Figure 5 As shown, this embodiment provides an assembly schematic diagram of a telemetry interface circuit, which is embedded in the RF module MMCP064G001-AS-T tube shell of the current microwave receiver inverter by assembling a bare chip integrated with an LTCC substrate, without changing any dimensions of the internal cavity of the tube shell, thereby realizing the function of gain gear remote control and telemetry.

[0127] In the figure, the gain plus command remote control circuit 1 is located on the low-frequency LTCC substrate LT2 on the front of the module; the gain minus command remote control circuit 2, the multi-mode counter 3, the digital-to-analog converter 4, and the proportional amplification telemetry interface circuit 5 are located on the low-frequency LTCC substrate LT10 on the front of the module; the parallel driver and the digitally controlled attenuator are located on the ceramic substrate of the RF cavity on the front of the module.

Claims

1. A chip-based remote control and telemetry circuit, characterized in that: It includes an optocoupler circuit, a counter chip U2, a data attenuator U3, a driver chip U4, a digital-to-analog converter chip U5, a proportional amplifier circuit and a telemetry interface circuit; The counter chip U2 is connected to the optocoupler circuit, the driver chip U4 and the digital-to-analog converter chip U5 respectively; The driver chip U4 is also connected to the data attenuator U3; The digital-to-analog converter chip U5 is connected to a proportional amplifier circuit, and the proportional amplifier circuit is also connected to a telemetry interface circuit.

2. The chip-based remote control and telemetry circuit according to claim 1, characterized in that: The model of the counter chip U2 is NC2218-1C-K; The UP terminal and DOWN terminal of the counter chip U2 are respectively connected to the optocoupler circuit; The D1, D2, D3, D4 and D5 terminals of the counter chip U2 are respectively connected to corresponding TTL levels; The VCC terminal of the counter chip U2 is connected to an external power supply; The GND terminal of the counter chip U2 is grounded; The CH terminal of the counter chip U2 is externally connected to the corresponding TTL level; The LD end of the counter chip U2 is left hanging; The Q1, Q2, Q3, Q4, and Q5 terminals of the counter chip U2 are connected to the digital-to-analog converter chip U5 and the driver chip U4, respectively.

3. The chip-based remote control and telemetry circuit according to claim 2, characterized in that: The model of the driver chip U4 is NC2206-1C-K; The model of the data attenuator U3 is NC1315C-108A; The model of the digital-to-analog converter chip U5 is GDA08SPH1; The Q1 terminal of the counter chip U2, the A2 terminal of the driver chip U4, and the DB2 terminal of the digital-to-analog converter chip U5 are connected together; The Q2 terminal of the counter chip U2, the A3 terminal of the driver chip U4, and the DB3 terminal of the digital-to-analog converter chip U5 are connected together; The Q3 terminal of the counter chip U2, the A4 terminal of the driver chip U4, and the DB4 terminal of the digital-to-analog converter chip U5 are connected together; The Q4 terminal of the counter chip U2, the A5 terminal of the driver chip U4, and the DB5 terminal of the digital-to-analog converter chip U5 are connected together; The Q5 terminal of the counter chip U2, the A6 terminal of the driver chip U4, and the DB6 terminal of the digital-to-analog converter chip U5 are connected together; The 1B and 2B terminals of the driver chip U4 are suspended; the A1 terminal of the driver chip U4 is grounded; The 1A, 2A, 3A, 3B, 4A, 4B, 5A, 5B, 6A, and 6B terminals of the driver chip U4 are connected to the V1, V2, V3, V4, V5, V6, V7, V8, V9, and V10 terminals of the data attenuator U3 in a one-to-one correspondence; The DB7 terminal of the digital-to-analog converter chip U5 is grounded, and the DB1 and DB0 terminals of the digital-to-analog converter chip U5 are grounded together; The GND, CS-, and CE- terminals of the digital-to-analog converter chip U5 are grounded together; The VCC terminal of the digital-to-analog converter chip U5 is connected to an external power supply; The VO chip UT, VO chip UTM and VO chip UTS ends of the digital-to-analog converter chip U5 are connected to one point, and the end point is connected to the proportional amplification circuit.

4. The chip-based remote control and telemetry circuit according to claim 3, characterized in that: The optocoupler circuit comprises a first optocoupler circuit and a second optocoupler circuit having the same structure; The first optical coupling circuit includes a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and an optical coupler OC1; The anode of the diode D1 is connected to the command input line; the cathode of the diode D1 is connected to one end of the resistor R1 and one end of the resistor R2; The other end of the resistor R1 is commonly connected to one end of the capacitor C1, one end of the resistor R3 and the first end of the optical coupler OC1; The other end of the resistor R2 is connected to the command loop, the other end of the capacitor C1 and the anode of the diode D2; the cathode of the diode D2 is connected to the other end of the resistor R3 and the second end of the optical coupler OC1; The third ends of the optical couplers OC1 of the first optical coupler circuit and the second optical coupler circuit are respectively connected to an external power supply; The fourth end of the optical coupler OC1 of the first optical coupler circuit is connected to the chip UP end of the counter chip U2 , and the fourth end of the optical coupler OC1 of the second optical coupler circuit is connected to the DOWN end of the counter chip U2 .

5. The chip-based remote control and telemetry circuit according to claim 4, characterized in that: The proportional amplification circuit includes a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C2, a diode D3 and an operational amplifier chip U1; One end of the resistor R4 is grounded, and the other end of the resistor R4 is connected to one end of the resistor R5 and the 1-pin of the operational amplifier chip U1; The other end of the resistor R5, the 10 chip UT end of the operational amplifier chip U1, one end of the capacitor C2, one end of the resistor R6, the cathode of the diode D3 and one end of the resistor R7 are connected; the other end of the resistor R7 is connected to the telemetry interface circuit; The other end of the capacitor C2, the other end of the resistor R6 and the positive electrode of the diode D3 are grounded together; The 1+ terminal of the operational amplifier chip U1 is connected to the VO chip UT, VO chip UTM, and VO chip UTS terminals of the digital-to-analog converter chip U5 through the resistor R8; The GND terminal of the operational amplifier chip U1 is grounded; The VCC terminal of the operational amplifier chip U1 is connected to an external power supply; The 2O chip UT terminal, 2- terminal and 2+ terminal of the operational amplifier chip U1 are suspended.

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