TGC circuit

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By designing a TGC circuit containing radio frequency signal generation, attenuation and amplification circuit, using PIN diode array and adjustable conduction control circuit, the problems of large calculations, loss of details and adjustment delays in the existing TGC technology are solved, and the problem of high-quality calculations, loss of details and adjustment delays are realized. The efficient, flexible adjustment and rapid response of RF signals are improved.

CN222466936UActive Publication Date: 2025-02-14SUZHOU MICROPORT ARGUS MEDICAL CORP

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Patent Information

Application Number: CN202323638828.3
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2023-12-29
Publication Date: 2025-02-14
Estimated Expiration: 2033-12-29

AI Technical Summary

Technical Problem

When the existing TGC technology processes echo signals in IVUS equipment, there are problems such as large calculation amount, loss of details and adjustment delay, making it difficult to achieve infinite adjustment and high-speed response.

Method used

A TGC circuit including a radio frequency signal generation circuit, a radio frequency signal attenuation circuit and a radio frequency signal amplification circuit is designed, and an adjustable attenuation and amplification of the radio frequency signal is realized using a PIN diode array and an adjustable conduction control circuit.

Benefits of technology

The amplification ratio of the RF signal is continuously adjustable, and the response speed is fast. It can be used with the software to achieve time-based function variables, improving the user experience.

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Abstract

The utility model discloses a TGC circuit, comprising a radio frequency signal generation circuit used for controlling the circuit to emit a radio frequency waveform signal; the radio frequency signal attenuation circuit is used for performing adjustable attenuation on the radio frequency waveform signal; the radio frequency signal amplification circuit is used for performing adjustable amplification on the radio frequency waveform signal; the radio frequency signal attenuation circuit comprises an input end, an input coupling circuit, a PIN diode array, a PIN diode conduction control circuit, an output coupling circuit and an output end. The radio frequency signal generation circuit used for controlling the circuit to emit the radio frequency waveform signal, the radio frequency signal attenuation circuit used for performing adjustable attenuation on the radio frequency waveform signal and the radio frequency signal amplification circuit used for performing adjustable amplification on the radio frequency waveform signal are combined, so that the amplification factor of the radio frequency signal is continuously adjustable; in addition, the response speed is high, time-based function variability of the magnification times can be achieved in cooperation with software, and the use experience is improved.

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Description

Technical Field

[0001] The utility model relates to the field of electricity, and mainly to a TGC circuit. Background Art

[0002] In IVUS equipment, due to the difference in the distance between the object under test and the ultrasonic probe, the received echo signal is strong near and weak far, which is reflected in the image as bright near and dark far. This is the original physical characteristic and a normal phenomenon. However, from the perspective of the user of the device, this is an unfriendly user experience. The user hopes to see the original properties of the object under test, which has nothing to do with the distance from the observation point. This requires signal compensation, which strengthens the signal far away from the observation ultrasonic probe to make it almost equal to the signal close to the ultrasonic wave. Since there is a functional relationship between the distance between the object under test and the probe and the time it takes for the ultrasonic wave to return, this method of signal compensation is generally called TGC.

[0003] There are two commonly used methods:

[0004] First, use software correction to convert the analog-to-digital value of the signal at the far end and multiply it by the magnification factor, so that it will show similar brightness when displayed. This method first increases the amount of computer calculations, and when the amount of data is large, the computer is overwhelmed. Second, it is implemented using software methods after all, and some details will be lost in the multiplication operation.

[0005] Second: Use RF attenuation chips. This method is widely used in the field of communications to adapt to changes in communication signal strength. However, the natural disadvantage of this method is that the attenuation adjustment is not infinite, there are only a few gears, and there is a delay between the setting and the final response. In a system that requires infinite adjustment at high speed, this method can only be said to be better than nothing. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the present application provides a TGC circuit.

[0007] The specific scheme of this application is as follows:

[0008] A TGC circuit, characterized by comprising:

[0009] A radio frequency signal generating circuit is used to control the circuit to send out a radio frequency waveform signal;

[0010] A radio frequency signal attenuation circuit, used for adjustable attenuation of radio frequency waveform signals;

[0011] A radio frequency signal amplifying circuit, used for adjustable amplification of radio frequency waveform signals;

[0012] The radio frequency signal attenuation circuit comprises an input end, an input coupling circuit, a PIN diode array, a PIN diode conduction control circuit, an output coupling circuit, and an output end.

[0013] In a specific implementation, the input end of the RF signal attenuation circuit is connected to the input coupling circuit, the input coupling circuit is connected to the PIN diode array, the PIN diode array is connected to the output coupling circuit, and the output coupling circuit is connected to the output end.

[0014] In a specific embodiment, the PIN diode array includes a first diode, a second diode, a third diode and a fourth diode.

[0015] In a specific embodiment, the cathode of the first diode is connected to the anode of the second diode, the anode of the first diode is connected to the anode of the third diode, the cathode of the second diode is connected to the cathode of the fourth diode, and the cathode of the third diode is connected to the anode of the fourth diode.

[0016] In a specific implementation, the input coupling circuit is connected to the cathode of the first diode and the anode of the second diode, and the output coupling circuit is connected to the cathode of the third diode and the anode of the fourth diode.

[0017] In a specific implementation, the PIN diode array is further connected to the PIN diode conduction control circuit, and the number of the PIN diode conduction control circuit is the same as the number of the diodes.

[0018] In a specific implementation, the PIN diode conduction circuit is composed of a control knob and a control transistor, and the PIN diode conduction control circuit is a first control circuit, a second control circuit, a third control circuit and a fourth control circuit.

[0019] In a specific embodiment, the base of the first control transistor is connected to the first control knob, the collector is connected to the anode of the first diode, and the emitter is connected to the input coupling circuit;

[0020] The base of the second control transistor is connected to the second control knob, the collector is connected to the cathode of the second diode, and the emitter is connected to the input coupling circuit;

[0021] The base of the third control transistor is connected to the third control knob, the collector is connected to the anode of the third diode, and the emitter is connected to the output coupling circuit;

[0022] The base of the fourth control transistor is connected to the fourth control knob, the collector is connected to the cathode of the fourth diode, and the emitter is connected to the output coupling circuit.

[0023] In a specific implementation, the radio frequency signal attenuation circuit further includes a bias power supply and a variable current control circuit.

[0024] In a specific implementation, the radio frequency signal amplifying circuit includes a high frequency transistor and a bias resistor.

[0025] The present application utilizes a radio frequency signal generating circuit for controlling a circuit to emit a radio frequency waveform signal, a radio frequency signal attenuation circuit for adjustable attenuation of the radio frequency waveform signal, and a radio frequency signal amplifying circuit for adjustable amplification of the radio frequency waveform signal. The combination of the three realizes continuous adjustable amplification of the radio frequency signal with fast response speed. With the help of software, the amplification factor can be variable based on a time function, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the radio frequency signal generating circuit of the present application.

[0027] Figure 2 is a schematic diagram of a radio frequency signal attenuation circuit of the present application.

[0028] Figure 3 is a schematic diagram of a radio frequency signal amplifying circuit of the present application. DETAILED DESCRIPTION

[0029] The present application is described in detail below. Although specific embodiments of the present application are shown, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0030] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the functional differences of components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" are open-ended terms and should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present application, but the description is based on the general principles of the specification and is not intended to limit the scope of the present application. The scope of protection of the present application shall be determined by the attached claims.

[0031] refer to Figure 1As shown, it shows a schematic diagram of the radio frequency signal generating circuit of the present application. The radio frequency signal generating device includes a digital-to-analog conversion module 1, an operational amplifier 2, a first load resistor 3 and a second load resistor 4, wherein the in-phase input terminal of the operational amplifier 2 is connected to the digital-to-analog conversion module 1, the inverting input terminal of the operational amplifier 2 is connected to the first load resistor 3, the output terminal of the operational amplifier 2 is connected to the second load resistor 4, the second load resistor 4 is also connected to the first load resistor 3, and the other end of the first load resistor 3 is grounded.

[0032] Specifically, the digital-to-analog conversion module 1 converts a discrete signal in the form of a binary digital quantity into a standard quantity and / or a reference quantity, and the converted digital signal enters the operational amplifier 2 for amplification and is output through the output end of the operational amplifier 2.

[0033] refer to Figure 2 As shown, it shows a schematic diagram of the radio frequency signal attenuation circuit of the present application. The radio frequency signal attenuation device includes an input terminal 5, an input transformer 6, an input coupling circuit 7, a PIN diode array 8, a PIN diode conduction control circuit 9, an output coupling circuit 10, an output transformer 11 and an output terminal 12, wherein the input terminal 5 is connected to the input coupling circuit 7, an input transformer 6 is arranged between the input terminal 5 and the input coupling circuit 7, the input coupling circuit 7 is connected to the PIN diode array 8, the PIN diode array 8 is connected to the output coupling circuit 10, the output coupling circuit 10 is connected to the output terminal 12, and an output transformer 11 is arranged between the output terminal 12 and the output coupling circuit 10; the PIN diode array 8 is also connected to the PIN diode conduction control circuit 9.

[0034] The PIN diode array 8 includes a first diode PIN1, a second diode PIN2, a third diode PIN3 and a fourth diode PIN4, the cathode of the first diode PIN1 is connected to the anode of the second diode PIN2, the anode of the first diode PIN1 is connected to the anode of the third diode PIN3, the cathode of the second diode PIN2 is connected to the cathode of the fourth diode PIN4, and the cathode of the third diode PIN3 is connected to the anode of the fourth diode PIN4. The input coupling circuit 7 is connected to the cathode of the first diode PIN1 and the anode of the second diode PIN2, and the output coupling circuit 10 is connected to the cathode of the third diode PIN3 and the anode of the fourth diode PIN4.

[0035] The PIN diode conduction circuit 9 includes a control knob and a control transistor, and the PIN diode conduction control circuit includes a first control circuit, a second control circuit, a third control circuit and a fourth control circuit. The base of the first control transistor Q1 is connected to the first control knob CON1, the collector is connected to the anode of the first diode PIN1, and the emitter is connected to the input coupling circuit; the base of the second control transistor Q2 is connected to the second control knob CON2, the collector is connected to the cathode of the second diode PIN2, and the emitter is connected to the input coupling circuit 7; the base of the third control transistor Q3 is connected to the third control knob CON3, the collector is connected to the anode of the third diode PIN3, and the emitter is connected to the output coupling circuit 10; the base of the fourth control transistor Q4 is connected to the fourth control knob CON4, the collector is connected to the cathode of the fourth diode PIN4, and the emitter is connected to the output coupling circuit 10.

[0036] Specifically, the first control circuit controls the current flowing through the first control transistor Q1 by rotating the first control knob CON1, thereby controlling the conduction and short circuit of the first diode PIN1; the second control circuit controls the current flowing through the second control transistor Q2 by rotating the second control knob CON2, thereby controlling the conduction and short circuit of the second diode PIN2; the third control circuit controls the current flowing through the first control transistor Q3 by rotating the first control knob CON3, thereby controlling the conduction and short circuit of the third diode PIN3; the fourth control circuit controls the current flowing through the fourth control transistor Q4 by rotating the fourth control knob CON4, thereby controlling the conduction and short circuit of the fourth diode PIN4. As the diodes are turned on and shorted, the bias voltage of the diode array formed by the diodes will also change, thereby causing a change in the attenuation value of the RF signal.

[0037] The RF signal attenuation circuit also includes a power supply voltage VCC+ and a power supply voltage VCC-. The power supply voltage VCC+ is connected to the RF signal attenuation circuit through the transistor CON5. The collector of the transistor CON5 is connected to the power supply voltage VCC+, and the base is connected to the control knob CON5. The control knob CON5 controls the current flowing through the transistor CON5, so as to further limit the current flowing through the first diode PIN1 and the third diode PIN3; the power supply voltage VCC- is connected to the RF signal attenuation circuit through the transistor CON6. The collector of the transistor CON6 is connected to the power supply voltage VCC+, and the base is connected to the control knob CON6. The control knob CON6 controls the current flowing through the transistor CON6, so as to further limit the current flowing through the second diode PIN2 and the fourth diode PIN4.

[0038] Specifically, the present application does not limit the types of diodes and transistors used. The control knobs used in the present application are all stepless control knobs to achieve stepless adjustment of the RF signal attenuation current.

[0039] refer to Figure 3 As shown, the RF signal amplification circuit includes a base bias resistor RB1, a base bias resistor RB2, an emitter resistor R1, an emitter resistor R2, a first amplifying transistor QR1 and a second amplifying transistor QR2. The base voltage of the first amplifying transistor QR1 is jointly borne by the base bias resistor RB1 and the base bias resistor RB2, the emitter resistor R1 is connected to the emitter of the first amplifying transistor QR1, and the emitter resistor R1 is connected to the base of the second amplifying transistor, the emitter of the second amplifying transistor Q2 is connected to the emitter resistor R2, and the base bias resistor RB2, the emitter resistor R1 and the emitter resistor R2 are all grounded.

[0040] Specifically, the static operating point of the amplifier transistor QR is adjusted by configurable bias resistors RB1 and RB2, thereby controlling the RF signal amplification factor. The static operating point is the voltage and current value of the RF signal amplifier circuit when it is in a DC working state when no AC signal is connected.

[0041] The present application utilizes a radio frequency signal generating circuit for controlling a circuit to emit a radio frequency waveform signal, a radio frequency signal attenuation circuit for adjustable attenuation of the radio frequency waveform signal, and a radio frequency signal amplification circuit for adjustable amplification of the radio frequency waveform signal, and uses a stepless knob to adjust the radio frequency signal attenuation current, further realizing that the amplification factor of the radio frequency signal is continuously adjustable and has a fast response speed. With the help of software, the amplification factor can be variable based on a time function, which improves the user experience.

[0042] The above is only a preferred embodiment of the utility model. It should be pointed out that a person skilled in the art can make several similar modifications and improvements without departing from the innovative concept of the utility model, and these modifications and improvements are also considered to be within the protection of the utility model.

Claims

1. A TGC circuit, characterized in that: include: A radio frequency signal generating circuit is used to control the circuit to send out a radio frequency waveform signal; A radio frequency signal attenuation circuit, used for adjustable attenuation of radio frequency waveform signals; A radio frequency signal amplifying circuit, used for adjustable amplification of radio frequency waveform signals; The radio frequency signal attenuation circuit comprises an input end, an input coupling circuit, a PIN diode array, a PIN diode conduction control circuit, an output coupling circuit, and an output end; Wherein, the input end of the radio frequency signal attenuation circuit is connected to the input coupling circuit, the input coupling circuit is connected to the PIN diode array, the PIN diode array is connected to the output coupling circuit, and the output coupling circuit is connected to the output end; The radio frequency signal generating circuit includes a digital-to-analog conversion module, an operational amplifier, a first load resistor and a second load resistor, wherein the in-phase input terminal of the operational amplifier is connected to the digital-to-analog conversion module, the inverting input terminal of the operational amplifier is connected to the first load resistor, the output terminal of the operational amplifier is connected to the second load resistor, the second load resistor is also connected to the first load resistor, and the other end of the first load resistor is grounded; The radio frequency signal amplifying circuit includes a base bias resistor (RB1), a base bias resistor (RB2), an emitter resistor (R1), an emitter resistor (R2), a first amplifying transistor and a second amplifying transistor, wherein the emitter resistor (R1) is connected to the emitter of the first amplifying transistor, the emitter resistor (R1) is connected to the base of the second amplifying transistor, the emitter of the second amplifying transistor is connected to the emitter resistor (R2), and the base bias resistor (RB2), the emitter resistor (R1) and the emitter resistor (R2) are all grounded.

2. The TGC circuit according to claim 1, characterized in that: The PIN diode array includes a first diode, a second diode, a third diode and a fourth diode.

3. The TGC circuit according to claim 2, characterized in that: The cathode of the first diode is connected to the anode of the second diode, the anode of the first diode is connected to the anode of the third diode, the cathode of the second diode is connected to the cathode of the fourth diode, and the cathode of the third diode is connected to the anode of the fourth diode.

4. The TGC circuit according to claim 2, characterized in that: The input coupling circuit is connected to the cathode of the first diode and the anode of the second diode, and the output coupling circuit is connected to the cathode of the third diode and the anode of the fourth diode.

5. The TGC circuit according to claim 1, characterized in that: The PIN diode array is also connected to the PIN diode conduction control circuit, and the number of the PIN diode conduction control circuit is the same as the number of the diodes.

6. The TGC circuit according to claim 2, characterized in that: The PIN diode conduction control circuit is composed of a control knob and a control transistor, and the PIN diode conduction control circuit includes a first control circuit, a second control circuit, a third control circuit and a fourth control circuit.

7. The TGC circuit according to claim 6, characterized in that The base of the first control transistor is connected to the first control knob, the collector is connected to the anode of the first diode, and the emitter is connected to the input coupling circuit; The base of the second control transistor is connected to the second control knob, the collector is connected to the cathode of the second diode, and the emitter is connected to the input coupling circuit; The base of the third control transistor is connected to the third control knob, the collector is connected to the anode of the third diode, and the emitter is connected to the output coupling circuit; The base of the fourth control transistor is connected to the fourth control knob, the collector is connected to the cathode of the fourth diode, and the emitter is connected to the output coupling circuit.

8. The TGC circuit according to claim 1, characterized in that: The radio frequency signal attenuation circuit also includes a bias power supply and a variable current control circuit.

9. The TGC circuit according to claim 1, characterized in that: The radio frequency signal amplifying circuit comprises a high frequency triode and a bias resistor.