A high amplitude drive circuit

Abstract

The utility model discloses a kind of high amplitude drive circuit, and the input signal (pulse signal) is input by capacitor C1 in the high amplitude drive circuit, then enter amplifier U1 after passing through the filter shaping circuit of resistance R1, resistance R2, resistance R3 and capacitor C2, capacitor C3 again.The input amplitude of amplifier U1 is set to 4 times amplification to reach amplifier U2, and the resistance parameter of matching resistance R4 and resistance R5 provides sufficient input current of amplifier U2.Amplification multiple of amplifier U2 is configured according to the amplitude requirement of output, and resistance R6 and resistance R7 provide sufficient driving current by capacitor C5 to be direct-current isolated output.This circuit can respond to 10-50mv low pulse, single-1KHz low frequency operating frequency, with low in-band fluctuation, pulse fidelity, output is not deformed, fast response, output rising edge 48ps@50%, high synchronous precision typical value 1.8ps, and meet the stringent electromagnetic compatibility requirement.

Description

Technical Field

[0001] This utility model relates to the field of signal processing, specifically to a high-amplitude driving circuit. Background Technology

[0002] Low-frequency pulsed current refers to pulsed current with a frequency not exceeding 1000Hz, whose voltage or current amplitude changes periodically according to a specific pattern. Compared with medium- and high-frequency currents, this current has the characteristics of limited penetration depth but high nerve stimulation efficiency, which conforms to the physiological characteristics of the absolute refractory period of nerve fibers (0.5ms), and can effectively induce nerve action potentials.

[0003] Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate within its electromagnetic environment without causing unacceptable electromagnetic interference to any other device in that environment. Therefore, EMC includes two aspects: firstly, the electromagnetic interference generated by the device during normal operation must not exceed certain limits; secondly, the device must have a certain degree of immunity to electromagnetic interference present in its environment, i.e., electromagnetic susceptibility.

[0004] Low-frequency pulsed currents are commonly used in the medical field, where electromagnetic compatibility requirements are higher. Furthermore, the amplitude of low-frequency fast pulses is typically low, necessitating preprocessing to ensure synchronization accuracy and interference resistance for the triggered object. However, existing low-frequency pulsed current amplitude driving circuits are complex and costly, making it difficult to achieve both synchronization accuracy and interference resistance at a low cost. Utility Model Content

[0005] In view of the above-mentioned shortcomings in the prior art, the present invention provides a high-amplitude driving circuit that solves the problem that the prior art is unable to achieve both synchronization accuracy and anti-interference at a low cost.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A high-amplitude driving circuit is provided, which includes amplifier U1 and amplifier U2; the input terminal of amplifier U1 is connected to one end of resistor R2 and one end of resistor R3 through capacitor C2; the other end of resistor R2 is connected to one end of capacitor C1 and one end of resistor R1; the other end of capacitor C1 is the input terminal of the high-amplitude driving circuit; the other end of resistor R3 is connected to one end of capacitor C3; the other end of capacitor C3, the other end of resistor R1, the negative terminal of amplifier U1 and the negative terminal of amplifier U2 are connected and grounded;

[0008] The output terminal of amplifier U1 is connected to one end of resistor R4, one end of resistor R5, and the input terminal of amplifier U2 through capacitor C4; the positive terminal of amplifier U1, the other end of resistor R4, and the other end of resistor R5 are connected to an external first power supply.

[0009] The output terminal of amplifier U2 is connected to one end of capacitor C5, one end of resistor R6, and one end of resistor R7, respectively; the other end of capacitor C5 is the output terminal of the high-amplitude drive circuit; the positive terminal of amplifier U2, the other end of resistor R6, and the other end of resistor R7 are connected to an external second power supply.

[0010] Furthermore, the external first power supply includes transformer chip U4. The VIN pin of transformer chip U4 is connected to grounding capacitor C7, grounding capacitor C8, the EN pin of transformer chip U4, and 5V voltage, respectively. The SS pin of transformer chip U4 is connected to grounding capacitor C9. The EP pin of transformer chip U4 is grounded. The GND pin of transformer chip U4 is grounded. The FB pin of transformer chip U4 is connected to one end of resistor R8, one end of resistor R10, and one end of resistor R11, respectively. The other end of resistor R8 is connected to the grounding resistor. The VOUT pin of transformer chip U4 is connected to the other end of resistor R10, one end of capacitor C10, grounding capacitors C11, C12, C13, C14, C15, C16, and C17, respectively, and serves as the output terminal of the external first power supply. The other end of resistor R11 is connected to the other end of capacitor C10.

[0011] Furthermore, the external second power supply includes transformer chip U5; the IN pin of transformer chip U5 is connected to the EN pin, BIAS pin, grounding capacitor C19, grounding capacitor C18 and 5V voltage respectively; the SS pin of transformer chip U5 is connected to grounding capacitor C20; the GND pin of transformer chip U5 is grounded; the FB pin of transformer chip U5 is connected to one end of resistor R12 and one end of resistor R14 respectively; the other end of resistor R14 is connected to grounding resistor R15; the PG pin of transformer chip U5 is connected to 5V voltage through resistor R13; the OUT pin of transformer chip U5 is connected to the other end of resistor R12, grounding capacitors C21, C22, C23, C24, C25, C26 and C27 respectively and serves as the output terminal of the external second power supply.

[0012] The beneficial effects of this invention are as follows: This high-amplitude drive circuit inputs the signal (pulse signal) through capacitor C1 (DC blocking), and then through a filter and shaping circuit composed of resistors R1, R2, R3, and capacitors C2 and C3 before entering amplifier U1. Amplifier U1 is set to amplify by 4 times to achieve the input amplitude of amplifier U2. The resistance parameters of matching resistors R4 and R5 provide sufficient input current for amplifier U2. The amplification factor of amplifier U2 is configured according to the output amplitude requirements, and resistors R6 and R7 provide sufficient drive current for DC blocking output via capacitor C5. This circuit can respond to low pulses of 10-50mV, operate at a low frequency of -1KHz, has low in-band ripple, pulse fidelity, no output distortion, fast response, output rise time of 48ps@50%, high synchronization accuracy (typical value 1.8ps), and meets stringent electromagnetic compatibility requirements. Attached Figure Description

[0013] Figure 1 This is a circuit diagram for a high-amplitude drive circuit.

[0014] Figure 2 Circuit diagram of the external first power supply;

[0015] Figure 3 This is a circuit diagram for an external second power supply. Detailed Implementation

[0016] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All inventions utilizing the concept of this utility model are protected.

[0017] like Figure 1 As shown, the high-amplitude drive circuit includes amplifier U1 and amplifier U2; the input terminal of amplifier U1 is connected to one end of resistor R2 and one end of resistor R3 through capacitor C2; the other end of resistor R2 is connected to one end of capacitor C1 and one end of resistor R1; the other end of capacitor C1 is the input terminal of the high-amplitude drive circuit; the other end of resistor R3 is connected to one end of capacitor C3; the other end of capacitor C3, the other end of resistor R1, the negative terminal of amplifier U1, and the negative terminal of amplifier U2 are connected and grounded.

[0018] The output terminal of amplifier U1 is connected to one end of resistor R4, one end of resistor R5, and the input terminal of amplifier U2 through capacitor C4; the positive terminal of amplifier U1, the other end of resistor R4, and the other end of resistor R5 are connected to an external first power supply.

[0019] The output terminal of amplifier U2 is connected to one end of capacitor C5, one end of resistor R6, and one end of resistor R7, respectively; the other end of capacitor C5 is the output terminal of the high-amplitude drive circuit; the positive terminal of amplifier U2, the other end of resistor R6, and the other end of resistor R7 are connected to an external second power supply.

[0020] like Figure 2 As shown, the external first power supply includes transformer chip U4. The VIN pin of transformer chip U4 is connected to grounding capacitor C7, grounding capacitor C8, the EN pin of transformer chip U4, and 5V voltage, respectively. The SS pin of transformer chip U4 is connected to grounding capacitor C9. The EP pin of transformer chip U4 is grounded. The GND pin of transformer chip U4 is grounded. The FB pin of transformer chip U4 is connected to one end of resistor R8, one end of resistor R10, and one end of resistor R11, respectively. The other end of resistor R8 is connected to the grounding resistor. The VOUT pin of transformer chip U4 is connected to the other end of resistor R10, one end of capacitor C10, grounding capacitors C11, C12, C13, C14, C15, C16, and C17, respectively, and serves as the output terminal of the external first power supply. The other end of resistor R11 is connected to the other end of capacitor C10.

[0021] like Figure 3 As shown, the external second power supply includes transformer chip U5; the IN pin of transformer chip U5 is connected to the EN pin, BIAS pin, grounding capacitor C19, grounding capacitor C18 and 5V voltage respectively; the SS pin of transformer chip U5 is connected to grounding capacitor C20; the GND pin of transformer chip U5 is grounded; the FB pin of transformer chip U5 is connected to one end of resistor R12 and one end of resistor R14 respectively; the other end of resistor R14 is connected to grounding resistor R15; the PG pin of transformer chip U5 is connected to 5V voltage through resistor R13; the OUT pin of transformer chip U5 is connected to the other end of resistor R12, grounding capacitors C21, C22, C23, C24, C25, C26 and C27 respectively and serves as the output terminal of the external second power supply.

[0022] This high-amplitude drive circuit inputs the signal (pulse signal) through capacitor C1 (DC blocking), then through a filter and shaping circuit composed of resistors R1, R2, R3, and capacitors C2 and C3 before entering amplifier U1. Amplifier U1 is set to amplify the signal by 4 times to achieve the input amplitude of amplifier U2. The resistance parameters of matching resistors R4 and R5 provide sufficient input current for amplifier U2. The amplification factor of amplifier U2 is configured according to the output amplitude requirements. Resistors R6 and R7 provide sufficient drive current for DC blocking output via capacitor C5. This circuit can respond to low pulses of 10-50mV, operate at a low frequency of -1kHz, has low in-band ripple, pulse fidelity, undistorted output, fast response, output rise time of 48ps@50%, high synchronization accuracy (typical value 1.8ps), and meets stringent electromagnetic compatibility requirements.

[0023] In practical implementation, this high-amplitude driving circuit has the following characteristics:

[0024] Low impulse response, 10-50mV;

[0025] Multi-pulse mode adaptation;

[0026] Operating at low frequency, single cycle -1kHz;

[0027] Low in-band oscillation;

[0028] Pulse fidelity is maintained, and the output remains undistorted.

[0029] Fast response, output rise time 48ps@50%;

[0030] Typical high synchronization accuracy is 1.8 ps;

[0031] Strict EMC / EMI design.

[0032] This high-amplitude drive circuit can be applied to phase modulator drives, high-frequency amplification, high-speed acquisition / measurement, precision synchronization systems, and arbitrary waveform generators.

[0033] In conclusion, this invention solves the problem of low amplitude in low-frequency fast pulses, which cannot meet the synchronization accuracy and anti-interference requirements of the triggered object. The simplified circuit design of this invention extends service life and reduces malfunctions. The EMC / EMI design ensures normal and stable operation in complex electromagnetic environments.

Claims

1. A high-amplitude driving circuit, characterized in that, This includes amplifiers U1 and U2; the input terminal of amplifier U1 is connected to one end of resistor R2 and one end of resistor R3 via capacitor C2; the other end of resistor R2 is connected to one end of capacitor C1 and one end of resistor R1; the other end of capacitor C1 is the input terminal of the high-amplitude drive circuit; the other end of resistor R3 is connected to one end of capacitor C3; the other end of capacitor C3, the other end of resistor R1, the negative terminal of amplifier U1, and the negative terminal of amplifier U2 are connected and grounded. The output terminal of amplifier U1 is connected to one end of resistor R4, one end of resistor R5, and the input terminal of amplifier U2 through capacitor C4; the positive terminal of amplifier U1, the other end of resistor R4, and the other end of resistor R5 are connected to an external first power supply. The output terminal of amplifier U2 is connected to one end of capacitor C5, one end of resistor R6, and one end of resistor R7, respectively; the other end of capacitor C5 is the output terminal of the high-amplitude drive circuit; the positive terminal of amplifier U2, the other end of resistor R6, and the other end of resistor R7 are connected to an external second power supply.

2. The high-amplitude driving circuit according to claim 1, characterized in that, The external first power supply includes transformer chip U4. The VIN pin of transformer chip U4 is connected to grounding capacitor C7, grounding capacitor C8, the EN pin of transformer chip U4, and 5V voltage, respectively. The SS pin of transformer chip U4 is connected to grounding capacitor C9. The EP pin of transformer chip U4 is grounded. The GND pin of transformer chip U4 is grounded. The FB pin of transformer chip U4 is connected to one end of resistor R8, one end of resistor R10, and one end of resistor R11, respectively. The other end of resistor R8 is connected to the grounding resistor. The VOUT pin of transformer chip U4 is connected to the other end of resistor R10, one end of capacitor C10, grounding capacitors C11, C12, C13, C14, C15, C16, and C17, respectively, and serves as the output terminal of the external first power supply. The other end of resistor R11 is connected to the other end of capacitor C10.

3. The high-amplitude driving circuit according to claim 1, characterized in that, The external second power supply includes transformer chip U5; the IN pin of transformer chip U5 is connected to the EN pin, BIAS pin, ground capacitor C19, ground capacitor C18 and 5V voltage respectively; the SS pin of transformer chip U5 is connected to ground capacitor C20; the GND pin of transformer chip U5 is grounded; the FB pin of transformer chip U5 is connected to one end of resistor R12 and one end of resistor R14 respectively; the other end of resistor R14 is connected to ground resistor R15; The PG pin of transformer chip U5 is connected to a 5V voltage through resistor R13; the OUT pin of transformer chip U5 is connected to the other end of resistor R12, grounding capacitors C21, C22, C23, C24, C25, C26 and C27 respectively, and serves as the output terminal of the external second power supply.

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