Test experiment device for voltage-controlled oscillator

Abstract

The utility model discloses a test experiment device for a voltage-controlled oscillator, and relates to the field of test experiments of voltage-controlled oscillators. Comprising a power supply input end, a power supply change-over switch circuit, a voltage-controlled oscillator integrated chip circuit, a frequency control circuit, a frequency dividing circuit, a first output test end, a voltage-controlled vibrator discrete device circuit, a voltage control signal change-over switch circuit, a voltage control signal input end, a second output test end and a liquid crystal display control circuit. The voltage-controlled oscillator test experiment device is provided with the high-precision voltage source and the frequency measurement module, can accurately control the input voltage and accurately measure the output frequency of a VCO (Voltage Controlled Oscillator), thereby ensuring the accuracy and reliability of the test result, which is particularly important for the application scene requiring the high-precision frequency source. Not only can fundamental frequency output of the VCO be measured, but also key performance parameters such as stability, phase noise, frequency tuning range and frequency response speed of the VCO can be evaluated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the test experiment field of voltage control oscillator, especially relates to a voltage control oscillator test experiment device. BACKGROUND

[0002] As a frequency source widely used in electronic systems, the performance of voltage control oscillator directly affects the stability and performance of the whole system. However, the traditional VCO test method often has problems such as complex equipment, cumbersome operation, limited test precision, etc. Therefore, it is of great significance to develop an integrated and intelligent voltage control oscillator test experiment device. As a key component in the fields of electronic communication, measurement instruments and automatic control, the performance of voltage control oscillator directly affects the stability and precision of the whole system. The traditional test method often has problems such as complex operation, low precision and low automation degree.

[0003] Therefore, it is necessary to propose a voltage control oscillator test experiment device to solve the above problems. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a voltage control oscillator test experiment device, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical scheme adopted by the utility model is:

[0006] A voltage control oscillator test experiment device, comprising a power supply input end, a power supply switching circuit, a voltage control oscillator integrated chip circuit, a frequency control circuit, a frequency division circuit, a first output test end, a voltage control oscillator discrete device circuit, a voltage control signal switching circuit, a voltage control signal input end, a second output test end, and a liquid crystal display control circuit. The power supply input end is electrically connected to the power supply switching circuit, and is electrically connected to the voltage control oscillator integrated chip circuit and the voltage control oscillator discrete device circuit. The voltage control oscillator integrated chip circuit is electrically connected to the first output test end. The voltage control oscillator discrete device circuit is electrically connected to the second output test end and the voltage control signal switching circuit. The voltage control signal switching circuit is electrically connected to the voltage control signal input end. The voltage control signal switching circuit is electrically connected to the power supply switching circuit. The liquid crystal display control circuit is electrically connected to the power supply switching circuit and the frequency control circuit. The voltage control oscillator integrated chip circuit is electrically connected to the frequency control circuit and the frequency division circuit.

[0007] Preferably, the power supply input end comprises a first digital source table access terminal for connecting with a first digital source table, which is controlled by the liquid crystal display control circuit through the power supply switching circuit; the liquid crystal display control circuit comprises a liquid crystal display screen, which comprises an integrated and discrete part; when the integrated part on the liquid crystal display screen of the liquid crystal display control circuit is operated, the first digital source table can be connected to the voltage-controlled oscillator integrated chip circuit to provide power supply for the voltage-controlled oscillator integrated chip circuit; when the discrete part is operated, the first digital source table can be connected to the voltage-controlled oscillator discrete device circuit to provide power supply for the voltage-controlled oscillator discrete device circuit.

[0008] Preferably, the power supply switching circuit is controlled by the liquid crystal display control circuit to control the power supply input end to be connected to the voltage-controlled oscillator integrated chip circuit and the voltage-controlled oscillator discrete device circuit; the power supply switching circuit comprises a relay K2; the voltage-controlled oscillator integrated chip circuit is used to test various parameters of the voltage-controlled oscillator integrated chip; and the power supply switching circuit comprises a replaceable IC socket, which facilitates replacement of different voltage-controlled oscillator integrated chips for testing.

[0009] Preferably, the frequency control circuit is connected to the SET pin of the voltage-controlled oscillator integrated chip circuit, and the frequency control circuit comprises three relays K3, K5 and K6; the first relay K3 is used to realize selection of a resistor RES1 to control frequency generation, which is controlled by the liquid crystal display control circuit; the liquid crystal display screen comprises RES->RES1, RES->RES2 and RES->source table 2 areas; the RES->RES1, RES->RES2 and RES->source table 2 areas all comprise a connection and a disconnection; when the connection in the RES->RES2 area of the liquid crystal display control circuit is operated, the SET pin of the voltage-controlled oscillator integrated chip circuit is connected to the RES1 resistor; and when the disconnection is operated, the SET pin of the voltage-controlled oscillator integrated chip circuit is disconnected from the RES1 resistor.

[0010] The second relay K5 is used to realize selection of a resistor RES2 to control frequency generation, which is controlled by the liquid crystal display control circuit; when the connection in the RES->RES2 area of the liquid crystal display control circuit is operated, the SET pin of the voltage-controlled oscillator integrated chip circuit is connected to the RES2 resistor; and when the disconnection is operated, the SET pin of the voltage-controlled oscillator integrated chip circuit is disconnected from the RES2 resistor.

[0011] The third relay K6 is used to select the voltage control frequency generation, which is controlled by the LCD display control circuit. When the connection is made in the RES->Source Table 2 area on the LCD screen of the LCD display control circuit, the SET pin of the voltage-controlled oscillator integrated chip circuit can be connected to the second digital source table. When the connection is made off, the SET pin of the voltage-controlled oscillator integrated chip circuit can be disconnected from the second digital source table.

[0012] Preferably, the frequency divider circuit is connected to the DIV pin of the voltage-controlled oscillator integrated chip circuit, includes a relay K1, and is controlled by the liquid crystal display control circuit. The liquid crystal display screen includes a DIV control area, which includes connections to VCC and GND. When the DIV control area of ​​the liquid crystal display control circuit is connected to VCC, the DIV pin of the voltage-controlled oscillator integrated chip circuit can be connected to VCC; when connected to GND, the DIV pin of the voltage-controlled oscillator integrated chip circuit can be connected to GND. The first output test terminal is used to connect to an oscilloscope to measure the output signal of the voltage-controlled oscillator integrated chip circuit, and includes the SMA terminal block SignalOut1.

[0013] Preferably, the voltage-controlled oscillator discrete component circuit uses an independent operational amplifier to build the voltage-controlled oscillator circuit, which makes it easier for users to understand the internal structure and working principle of the voltage-controlled oscillator; the voltage control signal switching circuit is used to control whether the second digital source meter connected to the voltage control signal input terminal is connected to the voltage-controlled oscillator discrete component circuit, and is controlled by the liquid crystal display control circuit. The liquid crystal display screen includes a voltage control area, which includes an on and off state. When the voltage control area is on the liquid crystal display screen of the liquid crystal display control circuit, pressing the on state allows the second digital source meter to be connected to the control voltage pin of the voltage-controlled oscillator discrete component circuit, and pressing the off state disconnects the second digital source meter from the control voltage pin of the voltage-controlled oscillator discrete component circuit.

[0014] Preferably, the voltage control signal input terminal includes a second source meter access terminal for connecting the second source meter into the test circuit to achieve voltage control; the second output test terminal is used to connect an oscilloscope to measure the output signal of the discrete component circuit of the voltage-controlled vibrator, and includes an SMA terminal block SignalOut1; the liquid crystal display control circuit includes a liquid crystal display screen and a control command conversion circuit.

[0015] The LCD screen displays the control interface of the testing device, allowing users to switch between different connection methods by touching different buttons.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The voltage-controlled oscillator (VCO) testing experimental device integrates a VCO experimental circuit built with an independent operational amplifier and a circuit section using an integrated VCO chip TL1799 on the same testing device to understand the internal structure and various parameter tests of the VCO. This allows beginners to better learn and master the working principle of VCO testing, which is the key point of the technical solution of this invention.

[0018] 2. This voltage-controlled oscillator (VCO) testing experimental device is equipped with a high-precision voltage source and frequency measurement module, enabling precise control of the input voltage and accurate measurement of the VCO's output frequency. This ensures the accuracy and reliability of the test results, which is particularly important for applications requiring a high-precision frequency source. It can not only measure the VCO's basic frequency output but also evaluate key performance parameters such as stability, phase noise, frequency tuning range, and frequency response speed. This comprehensive testing capability helps users fully understand the VCO's performance. Through integrated hardware design and an intuitive software interface, users can easily set test parameters, start the test process, and view and analyze test results in real time. This simple operation lowers the testing threshold and improves testing efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the device structure of this utility model;

[0020] Figure 2 This is the PCB diagram of this utility model;

[0021] Figure 3 This is a flowchart of the present invention;

[0022] Figure 4 This is the indicator light and power supply circuit diagram of this utility model;

[0023] Figure 5 This is the indicator light and power supply circuit diagram of this utility model;

[0024] Figure 6 This is the circuit diagram of the integrated device of this utility model;

[0025] Figure 7 This is a circuit diagram of the discrete components of this utility model;

[0026] Figure 8 This is a circuit diagram of the discrete components of this utility model;

[0027] Figure 9 This is a circuit diagram of the power supply and adjustable input voltage of the chip in this utility model.

[0028] In the diagram: 1. Power supply input terminal; 2. Power supply switching circuit; 3. Voltage-controlled oscillator integrated chip circuit; 4. Frequency control circuit; 5. Frequency divider circuit; 6. First output test terminal; 7. Voltage-controlled oscillator discrete component circuit; 8. Voltage control signal switching circuit; 9. Voltage control signal input terminal; 10. Second output test terminal; 11. LCD display control circuit. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0030] Example 1:

[0031] like Figures 1-9 As shown, a voltage-controlled oscillator (VCO) testing experimental device includes a power supply input terminal 1, a power supply switching circuit 2, a VCO integrated chip circuit 3, a frequency control circuit 4, a frequency divider circuit 5, a first output test terminal 6, a VCO discrete component circuit 7, a voltage control signal switching circuit 8, a voltage control signal input terminal 9, a second output test terminal 10, and a liquid crystal display control circuit 11. The power supply input terminal 1 is electrically connected to the power supply switching circuit 2, and the VCO integrated chip circuit 3 and the VCO discrete component circuit 7 are electrically connected. The voltage-controlled oscillator integrated chip circuit 3 is electrically connected to the first output test terminal 6. The voltage-controlled oscillator discrete component circuit 7 is electrically connected to the second output test terminal 10 and the voltage control signal switching circuit 8. The voltage control signal switching circuit 8 is electrically connected to the voltage control signal input terminal 9. The voltage control signal switching circuit 8 is electrically connected to the power supply switching circuit 2. The liquid crystal display control circuit 11 is electrically connected to the power supply switching circuit 2 and the frequency control circuit 4. The voltage-controlled oscillator integrated chip circuit 3 is electrically connected to the frequency control circuit 4 and the frequency divider circuit 5.

[0032] The power supply input terminal 1 includes a first digital source meter access terminal, which is used to connect to the first digital source meter and is controlled by the liquid crystal display control circuit 11 through the power supply switching circuit 2. The liquid crystal display control circuit 11 includes a liquid crystal display screen, which can be integrated or discrete. When operating the integrated circuit on the liquid crystal display screen of the liquid crystal display control circuit 11, the first digital source meter can be connected to the voltage-controlled oscillator integrated chip circuit 3 to provide power to the voltage-controlled oscillator integrated chip circuit 3. When operating the discrete circuit, the first digital source meter can be connected to the voltage-controlled oscillator discrete device circuit 7 to provide power to the voltage-controlled oscillator discrete device circuit 7.

[0033] The power supply switching circuit 2 is controlled by the LCD display control circuit 11 and is used to control the power supply input terminal 1 to connect to the voltage-controlled oscillator integrated chip circuit 3 and the voltage-controlled oscillator discrete component circuit 7. The power supply switching circuit 2 includes a relay K2. The voltage-controlled oscillator integrated chip circuit 3 is used to test various parameters of the voltage-controlled oscillator integrated chip. It includes a replaceable IC socket to facilitate the replacement and testing of different voltage-controlled oscillator integrated chips.

[0034] The frequency control circuit 4 is connected to the SET pin of the voltage-controlled oscillator integrated chip circuit 3. The frequency control circuit 4 includes three relays K3, K5, and K6. The first relay K3 is used to select the resistor RES1 to control the frequency generation, which is controlled by the liquid crystal display control circuit 11. The metallurgical display screen includes the RES->RES1, RES->RES2, and RES->Source Table 2 areas. The RES->RES1, RES->RES2, and RES->Source Table 2 areas all include connection and disconnection. When the connection is operated in the RES->RES2 area of ​​the liquid crystal display control circuit 11, the SET pin of the voltage-controlled oscillator integrated chip circuit 3 can be connected to the resistor RES1. When the disconnection is operated, the SET pin of the voltage-controlled oscillator integrated chip circuit 3 can be disconnected from the resistor RES1.

[0035] The second relay K5 is used to select the frequency generated by the resistor RES2. It is controlled by the LCD display control circuit 11. When the operation is connected in the RES->RES2 area on the LCD screen of the LCD display control circuit 11, the SET pin of the voltage-controlled oscillator integrated chip circuit 3 can be connected to the resistor RES2. When the operation is disconnected, the SET pin of the voltage-controlled oscillator integrated chip circuit 3 can be disconnected from the resistor RES2.

[0036] The third relay K6 is used to select the voltage control frequency generation and is controlled by the LCD display control circuit 11. When the operation connection is made in the RES->Source Table 2 area on the LCD screen of the LCD display control circuit 11, the SET pin of the voltage-controlled oscillator integrated chip circuit 3 can be connected to the second digital source table. When the operation is disconnected, the SET pin of the voltage-controlled oscillator integrated chip circuit 3 can be disconnected from the second digital source table.

[0037] The frequency divider circuit 5 is connected to the DIV pin of the voltage-controlled oscillator integrated chip circuit 3, and includes a relay K1. It is controlled by the liquid crystal display control circuit 11. The liquid crystal display screen includes a DIV control area, which includes connections to VCC and GND. When the DIV control area is connected to VCC on the liquid crystal display screen of the liquid crystal display control circuit 11, the DIV pin of the voltage-controlled oscillator integrated chip circuit 3 can be connected to VCC. When connected to GND, the DIV pin of the voltage-controlled oscillator integrated chip circuit 3 can be connected to GND. The first output test terminal 6 is used to connect to an oscilloscope to measure the output signal of the voltage-controlled oscillator integrated chip circuit 3, and includes the SMA terminal SignalOut1.

[0038] The voltage-controlled oscillator discrete component circuit 7 uses an independent operational amplifier to build the voltage-controlled oscillator circuit, making it easier for users to understand the internal structure and working principle of the voltage-controlled oscillator. The voltage control signal switching circuit 8 is used to control whether the second digital source meter connected to the voltage control signal input terminal 9 is connected to the voltage-controlled oscillator discrete component circuit 7. It is controlled by the liquid crystal display control circuit 11. The liquid crystal display screen includes a voltage control area, which includes an on and off state. When the voltage control area is displayed on the liquid crystal display screen of the liquid crystal display control circuit 11, pressing the on button connects the second digital source meter to the control voltage pin of the voltage-controlled oscillator discrete component circuit 7. Pressing the off button disconnects the second digital source meter from the control voltage pin of the voltage-controlled oscillator discrete component circuit 7.

[0039] The voltage control signal input terminal 9 includes a second source meter access terminal for connecting the second source meter into the test circuit to achieve voltage control; the second output test terminal 10 is used to connect an oscilloscope to measure the output signal of the voltage-controlled vibrator discrete device circuit 7, and includes an SMA terminal SignalOut1; the liquid crystal display control circuit 11 includes a liquid crystal display screen and a control command conversion circuit.

[0040] The LCD screen displays the control interface of the testing device, allowing users to switch between different connection methods by touching different buttons.

[0041] It should be noted that this utility model is a voltage-controlled oscillator testing experimental device. When using it... Figure 3 As shown, connect the power supply of the voltage-controlled oscillator test experimental device to the power socket of the test bench, and turn on the power switch of the voltage-controlled oscillator test experimental device. At this time, the indicator light on the experimental circuit board will light up, the screen will light up, and it will enter the working state.

[0042] Connect the red terminal FORCE_HI of the first digital source meter to SOURCE+ of the voltage-controlled oscillator test experimental device, and the black terminal FORCE_LO to SOURCE- of the voltage-controlled oscillator test experimental device. Set the first digital source meter to voltage source and current detection mode, set the voltage to 5V, and limit the current to 100mA. At this time, the first digital source meter supplies power to the voltage-controlled oscillator test experimental device.

[0043] Connect the red terminal of FORCE_HI of the second digital source meter to SOURCE+ of the voltage-controlled oscillator test experimental device, and the black terminal FORCE_LO to SignalIn- of the voltage-controlled oscillator test experimental device. Set the second digital source meter to voltage source and current detection mode, adjust the voltage range to 0.1V-0.7V, and limit the current to 100uA. At this time, the second digital source meter provides an adjustable voltage to the voltage-controlled oscillator test experimental device.

[0044] Pressing the "Connect" button in the RES->Source Meter 2 control area of ​​the LCD screen will connect the SET pin of the RF transmitter chip circuit 3 to the second digital source meter; pressing the "Connect" button in the power supply control area will connect the SOURCE power supply to the integrated chip.

[0045] Connect the BNC to SMA converter of the CH1 channel of the oscilloscope to SignalOut1 of the voltage-controlled oscillator test experimental device, turn on the channel 1 switch of the oscilloscope, and adjust the time reference to 400ns / dv and the voltage reference to 1V / dv.

[0046] After completing the above preparations and settings, the next step is to test the accuracy and stability of the duty cycle output of the integrated chip: adjust the voltage input to the integrated chip through the second digital source meter, which will control the output duty cycle of the integrated chip, and use an oscilloscope connected to the output terminal of the integrated chip to capture its output waveform.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A voltage-controlled oscillator (VCO) testing experimental apparatus, comprising a power supply input terminal (1), a power supply switching circuit (2), a VCO integrated chip circuit (3), a frequency control circuit (4), a frequency divider circuit (5), a first output test terminal (6), a VCO discrete component circuit (7), a voltage control signal switching circuit (8), a voltage control signal input terminal (9), a second output test terminal (10), and a liquid crystal display control circuit (11), characterized in that: The power supply input terminal (1) is electrically connected to the power supply switching circuit (2), and is electrically connected to the color-controlled oscillator integrated chip circuit (3) and the voltage-controlled oscillator discrete device circuit (7). The voltage-controlled oscillator integrated chip circuit (3) is electrically connected to the first output test terminal (6). The voltage-controlled oscillator discrete device circuit (7) is electrically connected to the second output test terminal (10) and the voltage control signal switching circuit (8). The voltage control signal switching circuit (8) is electrically connected to the voltage control signal input terminal (9). The voltage control signal switching circuit (8) is electrically connected to the power supply switching circuit (2). The liquid crystal display control circuit (11) is electrically connected to the power supply switching circuit (2) and the frequency control circuit (4). The voltage-controlled oscillator integrated chip circuit (3) is electrically connected to the frequency control circuit (4) and the frequency divider circuit (5).

2. The voltage-controlled oscillator testing apparatus according to claim 1, characterized in that: The power supply input terminal (1) includes a first digital source meter access terminal, which is used to connect to the first digital source meter and is controlled by the liquid crystal display control circuit (11) through the power supply switching circuit (2). The liquid crystal display control circuit (11) includes a liquid crystal display screen, which includes integrated and discrete components. When operating the integrated component on the liquid crystal display screen of the liquid crystal display control circuit (11), the first digital source meter can be connected to the voltage-controlled oscillator integrated chip circuit (3) to provide power to the voltage-controlled oscillator integrated chip circuit (3). When operating the discrete component, the first digital source meter can be connected to the voltage-controlled oscillator discrete device circuit (7) to provide power to the voltage-controlled oscillator discrete device circuit (7).

3. The voltage-controlled oscillator testing apparatus according to claim 1, characterized in that: The power supply switching circuit (2) is controlled by the liquid crystal display control circuit (11) and is used to control the power supply input terminal (1) to be connected to the voltage-controlled oscillator integrated chip circuit (3) and the voltage-controlled oscillator discrete device circuit (7); the power supply switching circuit (2) includes a relay K2; the voltage-controlled oscillator integrated chip circuit (3) is used to test various parameters of the voltage-controlled oscillator integrated chip; it includes a replaceable IC socket to facilitate the replacement and testing of different voltage-controlled oscillator integrated chips.

4. The voltage-controlled oscillator testing apparatus according to claim 3, characterized in that: The frequency control circuit (4) is connected to the SET pin of the voltage-controlled oscillator integrated chip circuit (3). The frequency control circuit (4) includes three relays K3, K5, and K6. The first relay K3 is used to select the resistor RES1 to control the frequency generation, which is controlled by the liquid crystal display control circuit (11). The metallurgical display screen includes the RES->RES1, RES->RES2, and RES->Source Table 2 areas. The RES->RES1, RES->RES2, and RES->Source Table 2 areas all include connection and disconnection. When the connection is operated in the RES->RES2 area of ​​the liquid crystal display control circuit (11), the SET pin of the voltage-controlled oscillator integrated chip circuit (3) can be connected to the RES1 resistor. When the disconnection is operated, the SET pin of the voltage-controlled oscillator integrated chip circuit (3) can be disconnected from the RES1 resistor. The second relay K5 is used to select the frequency generated by the resistor RES2. It is controlled by the LCD display control circuit (11). When the operation is connected in the RES->RES2 area on the LCD screen of the LCD display control circuit (11), the SET pin of the voltage-controlled oscillator integrated chip circuit (3) can be connected to the resistor RES2. When the operation is disconnected, the SET pin of the voltage-controlled oscillator integrated chip circuit (3) can be disconnected from the resistor RES2. The third relay K6 is used to select the voltage control frequency generation and is controlled by the liquid crystal display control circuit (11). When the operation connection is made in the RES->Source Table 2 area of ​​the liquid crystal display screen of the liquid crystal display control circuit (11), the SET pin of the voltage-controlled oscillator integrated chip circuit (3) can be connected to the second digital source table. When the operation is disconnected, the SET pin of the voltage-controlled oscillator integrated chip circuit (3) can be disconnected from the second digital source table.

5. The voltage-controlled oscillator testing apparatus according to claim 1, characterized in that: The frequency divider circuit (5) is connected to the DIV pin of the voltage-controlled oscillator integrated chip circuit (3), and includes a relay K1. It is controlled by the liquid crystal display control circuit (11). The liquid crystal display screen includes a DIV control area, which includes a connection to VCC and a connection to GND. When the DIV control area of ​​the liquid crystal display control circuit (11) is connected to VCC, the DIV pin of the voltage-controlled oscillator integrated chip circuit (3) can be connected to VCC. When the DIV control area is connected to GND, the DIV pin of the voltage-controlled oscillator integrated chip circuit (3) can be connected to GND. The first output test terminal (6) is used to connect to an oscilloscope to measure the output signal of the voltage-controlled oscillator integrated chip circuit (3), and includes the SMA terminal SignalOut1.

6. The voltage-controlled oscillator testing apparatus according to claim 1, characterized in that: The voltage-controlled oscillator discrete device circuit (7) uses an independent operational amplifier to build the voltage-controlled oscillator circuit, which makes it easy for users to understand the internal structure and working principle of the voltage-controlled oscillator; the voltage control signal switching circuit (8) is used to control whether the second digital source meter connected to the voltage control signal input terminal (9) is connected to the voltage-controlled oscillator discrete device circuit (7). It is controlled by the liquid crystal display control circuit (11). The liquid crystal display screen includes a voltage control area, which includes on and off states. When the voltage control area is on the liquid crystal display screen of the liquid crystal display control circuit (11), pressing on the on state will connect the second digital source meter to the control voltage pin of the voltage-controlled oscillator discrete device circuit (7). Pressing on the off state will disconnect the second digital source meter from the control voltage pin of the voltage-controlled oscillator discrete device circuit (7).

7. The voltage-controlled oscillator testing apparatus according to claim 1, characterized in that: The voltage control signal input terminal (9) includes a second source meter access terminal for connecting the second source meter into the test circuit to achieve voltage control; the second output test terminal (10) is used to connect an oscilloscope to measure the output signal of the voltage-controlled vibrator discrete device circuit (7), and includes an SMA terminal SignalOut1; the liquid crystal display control circuit (11) includes a liquid crystal display screen and a control command conversion circuit. The LCD screen displays the control interface of the testing device, allowing users to switch between different connection methods by touching different buttons.

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