CN210405235U - Signal amplification circuit of four-quadrant detector - Google Patents
Signal amplification circuit of four-quadrant detector Download PDFInfo
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- CN210405235U CN210405235U CN201920561411.6U CN201920561411U CN210405235U CN 210405235 U CN210405235 U CN 210405235U CN 201920561411 U CN201920561411 U CN 201920561411U CN 210405235 U CN210405235 U CN 210405235U
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Abstract
The utility model relates to a four-quadrant detector signal amplifier circuit, including the four-quadrant detector, still include with transimpedance amplifier, voltage amplification circuit and amplitude limiting amplifier circuit that the four-quadrant detector connected gradually, the current output signal after photoelectric conversion of the four-quadrant detector is transmitted respectively to transimpedance amplifier, voltage amplification circuit and amplitude limiting amplifier circuit and is carried out signal amplification. Firstly, a transimpedance amplifier is adopted to limit the direct current noise of a photodiode through alternating current coupling, a resistor at the positive end of an operational amplifier is used for compensating the leakage current of the photodiode, a capacitor connected in parallel with the operational amplifier is used for reducing the resistance thermal noise, and the signal-to-noise ratio is improved; and then the amplification factor of the signal is controlled by a feedback network of the voltage amplification circuit, finally, the amplitude limiting amplification is realized by the amplitude limiting amplification circuit and the broadband high-gain voltage limiting amplifier, and the amplification factor is determined by the feedback network, so that the effects of high gain and high bandwidth are realized.
Description
Technical Field
The utility model relates to a photoelectric detector signal processing field especially relates to a four-quadrant detector signal amplification circuit.
Background
The four-quadrant detector has the advantages of high spectral response range, high positioning accuracy, high resolving speed and the like, and is widely applied to the fields of laser collimation, laser centering, laser guiding, laser alarming, laser reconnaissance, laser automatic tracking and the like. The four-quadrant detector is formed by integrating four photoelectric tubes with almost the same performance according to a four-quadrant distribution mode, and the light spots are calculated and positioned according to a certain algorithm by utilizing the sizes of optical signals output by the four quadrants. The four-quadrant detector is used in laser detection applications such as laser radar, laser echo signals are often weak, laser repetition frequency is high, laser pulse width is narrow, and the laser radar often requires a large detection dynamic range, so that a signal amplification circuit of the four-quadrant detector requires high gain, high response bandwidth and a high dynamic range. However, in the prior art, the requirement cannot be met by adopting a one-stage amplification structure, and generally, a multi-stage amplification and gain control method is adopted, but the technology is more complex.
In addition, the four-quadrant photoelectric detector can also work in a pulse signal broadening and collecting mode with a peak value detection circuit and a peak value holding circuit as cores, under the irradiation of the target indicator pulse laser, the four-quadrant photoelectric detector outputs a narrow pulse electric signal, and the narrow pulse electric signal is subjected to pre-amplification and filtering to meet the requirements of data collection amplitude and signal to noise ratio. The peak value detection circuit is used for detecting the peak value of the narrow pulse electric signal and providing accurate peak value sampling time for the analog-to-digital converter. The signal processing unit receives the pulse signal amplitude digital quantity output by the analog-to-digital converter, controls the discharging circuit to discharge the energy storage capacitor in the peak holding circuit, then calculates and processes the pulse signal amplitude digital quantity to obtain light spot center position information and outputs the light spot center position information to the upper computer control system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a four-quadrant detector signal amplifier circuit for solve the problem that current four-quadrant photoelectric detector can't realize high-gain and high bandwidth to weak light signal.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
the utility model provides a four-quadrant detector signal amplification circuit, including the four-quadrant detector and with transimpedance amplifier, voltage amplification circuit and amplitude limiting amplifier circuit that the four-quadrant detector connected gradually, the four-quadrant detector turns into the current signal with the light signal and carries out signal amplification through transimpedance amplifier, voltage amplification circuit and amplitude limiting amplifier circuit respectively.
Further, the transimpedance amplifier is composed of a photodiode D1, a resistor R1, a resistor R2, a resistor Rf, a capacitor Ci, a capacitor C2, a capacitor Cf and an operational amplifier a1, a bias voltage of the four-quadrant detector is input to the anode of the photodiode D1, the cathode of the photodiode D1 is respectively connected to one ends of the resistor R1, the capacitor Ci and the capacitor Ci, the other end of the capacitor Ci is connected to the cathode of the input end of the operational amplifier a1, the other ends of the resistor R1 and the capacitor Ci are grounded, one end of the resistor R2 and the capacitor C3 is connected in parallel to the anode of the input end of the operational amplifier a1, the other end of the resistor is grounded, the resistor Rf and the capacitor Cf are connected in parallel to the cathode of the input end of the operational amplifier a1 and the two ends of the output end of the operational amplifier.
Further, the voltage amplifying circuit comprises a high-speed operational amplifier D2, a resistor R12 to a resistor R15, a capacitor C34 to a capacitor C41, the high-speed operational amplifier D2 is of the type ADA4899, an output end of the operational amplifier a1 is connected to an anode of an input end of the high-speed operational amplifier D1, an anode of an input end of the high-speed operational amplifier D2 is grounded via a resistor R15, the resistor R12, the resistor R13 and the capacitor C34 form a feedback network circuit, after being connected in parallel, the resistor R12 and the capacitor C34 are connected to a feedback end of the high-speed operational amplifier D2, and the other ends of the resistor R2 and the input end of the high-speed operational amplifier D2 are respectively connected to a cathode of the input end of the high-speed operational amplifier D2, one ends of the capacitor C2 and the capacitor C2 are connected to a cathode of the voltage end of the operational amplifier D2, one end of the resistor R2 is connected to an output end of the operational amplifier D2, the other ends of the resistor R14, the resistor R13, the capacitor C35, the capacitor C36, the capacitor C38 and the capacitor C41 are grounded, and the output end of the operational amplifier D2 is connected with the amplitude limiting amplification circuit through the capacitor C37.
Further, the amplitude limiting amplifying circuit comprises a broadband high-gain voltage limiting amplifier U3, a resistor R25 to a resistor R33, a capacitor C61 to a capacitor C67 and a SAM joint, the broadband high-gain voltage limiting amplifier U3 is in an OPA699 model, one end of the resistor R27 and the capacitor C62 after being connected in parallel is connected with the negative pole of the input end of the broadband high-gain voltage limiting amplifier U3 and one end of the resistor R28, the other end of the resistor R27 is connected with the output end of the broadband high-gain voltage limiting amplifier U3, one ends of the resistor R29, the capacitor C65, the capacitor C66 and the resistor R32 are connected with the negative pole of the voltage end of the broadband high-gain voltage limiting amplifier U3, the other end of the resistor R3, one end of the resistor R3 and one end of the capacitor C3 are connected with the low end of the broadband high-gain voltage limiting amplifier U3, one ends of the resistor R3, the positive pole of the resistor R3 and the capacitor C3 are connected with the high-gain voltage limiting amplifier U3, the output end of the broadband high-gain voltage limiting amplifier U3 is connected with the SAM connector through a resistor R30, one end of the resistor R31 is connected with a resistor R29, and the other ends of the resistor R31, the resistor R28, the resistor R25, the resistor R33, the capacitor C61, the capacitor C63 and the capacitor C67 are grounded.
Further, the resistor R1 is a current-limiting resistor, the capacitor Ci is a parasitic input total capacitor, the capacitor Ci is an ac coupling capacitor, the noise voltage gain of the operational amplifier a1 in the low frequency band is 1+ the value of the resistor Rf/the value of the resistor R1, and the noise voltage gain of the operational amplifier a1 in the high frequency band is 1+ (the value of the capacitor Ci// the value of the capacitor Cl)/the value of the capacitor Cf.
Further, this signal amplification circuit still include power supply circuit and with the low noise voltage stabilizing circuit that power supply circuit connects for provide the power for signal amplification circuit, power supply circuit includes that the model is LT1931 negative output voltage regulator and the model is MP1593 step-down power module, the negative output voltage regulator is used for converting outside 12V mains voltage into-6V voltage output, step-down power module is used for converting outside 12V mains voltage into 5V voltage output, low noise voltage stabilizing circuit adopts the model to be the low pressure drop linear voltage regulator of Tps7a4700 and Tps7a3301, carries out the steady voltage to the 5V voltage of step-down power module output respectively and to-6V voltage steady voltage to-5V voltage of negative output voltage regulator output.
The utility model discloses a four-quadrant detector signal amplification circuit, at first adopt the transimpedance amplifier, through AC coupling, restrict photodiode's direct current noise, forward end resistance is used for compensating photodiode leakage current, and the electric capacity that connects in parallel with it is used for subducing resistance thermal noise, improves the SNR; and then the amplification factor of the signal is controlled by a feedback network of the voltage amplification circuit, finally, the amplitude limiting amplification is realized by the amplitude limiting amplification circuit and the broadband high-gain voltage limiting amplifier, and the amplification factor is determined by the feedback network, so that the effects of high gain and high bandwidth are realized.
Drawings
Fig. 1 is a schematic block diagram of a signal amplification circuit of a four-quadrant detector according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a transimpedance amplifier according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a voltage amplifying circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a limiting amplification circuit according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
The utility model discloses a four-quadrant detector signal amplifier circuit, like figure 1, including four-quadrant detector and the transimpedance amplifier, voltage amplification circuit and the amplitude limiting amplifier circuit that connect gradually with the four-quadrant detector, the current output signal after photoelectric conversion of four-quadrant detector is transmitted respectively to transimpedance amplifier, voltage amplification circuit and amplitude limiting amplifier circuit and is carried out signal amplification.
In one embodiment, as shown in fig. 2, the transimpedance amplifier is composed of a photodiode D1, a resistor R1, a resistor R2, a resistor Rf, a capacitor Ci, a capacitor C2, a capacitor Cf, and an operational amplifier a 1. The bias voltage of the four-quadrant detector is input into the anode of a photodiode, the cathode of the photodiode is respectively connected with one end of a resistor R1, a capacitor Ci and a capacitor CI, the other end of the capacitor CI is connected with the cathode of the input end of an operational amplifier, one end of a resistor R2 is connected with the anode of the input end of the operational amplifier after being connected with a capacitor C3 in parallel, a resistor Rf is connected with the capacitor Cf in parallel and then connected with the cathode of the input end of the operational amplifier and the two ends of the output end of the operational amplifier, the other end of the resistor R1, the capacitor Ci, the resistor R2 and the.
The model of the operational amplifier a1 is OPA657, the resistor R1 is a current-limiting resistor, the resistance is 100K, the capacitor Ci is a parasitic input total capacitor, the capacitor Ci is an ac coupling capacitor, the capacitance is 0.1uf, the noise voltage gain of the operational amplifier a1 in the low frequency band is 1+ the value of resistor Rf/the value of resistor R1, because the value of resistor Rf is close to the value of resistor R1, the noise gain in the low frequency band is large, and the noise voltage gain of the operational amplifier a1 in the high frequency band is 1+ (the value of capacitor Ci// the value of capacitor Cl)/the value of capacitor Cf. The direct current noise of the photodiode is limited by adopting alternating current coupling, and the positive end resistor of the operational amplifier is used for compensating the leakage current of the photodiode and reducing the resistance thermal noise.
In one embodiment, as shown in fig. 3, the voltage amplifying circuit includes a high speed operational amplifier D2, resistors R12 through R15, and capacitors C34 through C41. The model of the high-speed operational amplifier D2 is ADA4899, the output terminal of the operational amplifier A1 is connected with the positive electrode of the input terminal of the high-speed operational amplifier D2, the positive electrode of the input terminal of the high-speed operational amplifier D2 is grounded through a resistor R15, the resistor R12, the resistor R13 and the capacitor C34 form a feedback network circuit, after the resistor R12 and the capacitor C34 are connected in parallel, one end of the resistor R12 is connected with the feedback end of the high-speed operational amplifier D2, the other end of the resistor R13 is connected with the negative electrode of the input end of the high-speed operational amplifier D2, one end of each of the capacitor C38, the capacitor C39, the capacitor C40 and the capacitor C41 is connected with the negative electrode of the voltage end of the operational amplifier D2, one end of each of the capacitor C35 and the capacitor C36 is connected with the positive electrode and the DISB end of the voltage end of the operational amplifier D2, one end of the resistor R14 is connected with the output end of the operational amplifier D2, the other end of each of the resistor R14, the resistor R13, the capacitor C35, the capacitor C36 and the capacitor C38 to the capacitor C41 is grounded, and the output end of the operational amplifier D2 is connected with the amplitude limiting amplifying circuit through. The resistance value of the resistor R12 is 200K, the resistance value of the resistor R13 is 49.9K, the capacitance value of the capacitor C34 is 100pF, and the amplification factor of the voltage amplification circuit is determined by a feedback network formed by the resistor R12, the resistor R13 and the capacitor C34.
In one embodiment, as shown in fig. 4, the limiting amplifier circuit includes a wideband high-gain voltage limiting amplifier U3, a resistor R25 to a resistor R33, a capacitor C61 to a capacitor C67 and a SAM terminal, the wideband high-gain voltage limiting amplifier U3 is in an OPA699 type, after the resistor R27 and the capacitor C62 are connected in parallel, one end of the resistor R27 and the capacitor C62 is connected to a negative electrode of an input terminal of the wideband high-gain voltage limiting amplifier U3 and one end of the resistor R28, the other end of the resistor R3 is connected to an output terminal of the wideband high-gain voltage limiting amplifier U3, one ends of the resistor R29, the capacitor C65, the capacitor C66 and the resistor R32 are connected to a negative electrode of a voltage terminal of the wideband high-gain voltage limiting amplifier U3, the other end of the resistor R3, one end of the resistor R3 and one end of the capacitor C3 are connected to a low-potential terminal of the wideband high-gain voltage limiting amplifier U3, one end of the resistor R3 and the capacitor C3 are connected to a high-potential voltage limiting amplifier U3, the output end of the broadband high-gain voltage limiting amplifier U3 is connected with the SAM connector through a resistor R30, one end of the resistor R31 is connected with a resistor R29, and the other ends of the resistor R31, the resistor R28, the resistor R25, the resistor R33, the capacitor C61, the capacitor C63 and the capacitor C67 are grounded.
In the amplitude limiting amplifying circuit, a broadband high-gain voltage limiting amplifier with the model of OPA699 is adopted to realize amplitude limiting amplification, and a feedback network loop is formed by a resistor R27 and a resistor R28 to determine the amplification factor. The limiting amplitude is determined by the voltage on the resistor R33 and the resistor R25, the output of the amplitude limiting amplifying circuit adopts a SMA joint of 50 ohms, and a resistor R30 of 49 ohms is connected in series between the output end of the broadband high-gain voltage limiting amplifier U3 and the SMA joint for impedance matching.
The utility model discloses a four-quadrant detector signal amplification circuit still includes power supply circuit and the low noise voltage stabilizing circuit who is connected with power supply circuit for provide the power for signal amplification circuit. The power circuit comprises an LT1931 negative output voltage stabilizer and an MP1593 buck power module, the negative output voltage stabilizer is used for converting external 12V power voltage into-6V voltage output, the buck power module is used for converting the external 12V power voltage into 5V voltage output, the low-noise voltage stabilizing circuit adopts low-voltage-drop linear voltage stabilizers with the models of Tps7a4700 and Tps7a3301, and the 5V voltage output by the buck power module is stabilized and the-6V voltage output by the negative output voltage stabilizer is stabilized to-5V voltage respectively.
The utility model discloses a four-quadrant detector signal amplification circuit inputs bias voltage temperature compensation and high pressure to four-quadrant detector through external system, and the current output signal after photoelectric conversion of four-quadrant detector adopts the transimpedance amplifier at first, through ac coupling, restricts photodiode's direct current noise, and forward end resistance is used for compensating photodiode leakage current to rather than the electric capacity that connects in parallel is used for subducing the resistance thermal noise, improves the SNR; and then the amplification times of the signals are controlled by a feedback network circuit of the voltage amplification circuit, and finally, amplitude limiting amplification is realized by adopting a broadband high-gain voltage-limiting amplifier through an amplitude limiting amplification circuit, so that the beneficial effects of high gain and high bandwidth are realized.
The above-mentioned embodiments further explain in detail the objects, technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only the embodiments of the present invention, and are not intended to limit the scope of the present invention, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (6)
1. A four-quadrant detector signal amplification circuit, includes four-quadrant detector, its characterized in that: the four-quadrant detector is characterized by further comprising a transimpedance amplifier, a voltage amplification circuit and an amplitude limiting amplification circuit which are sequentially connected with the four-quadrant detector, wherein current output signals of four quadrants of the four-quadrant detector after photoelectric conversion are respectively transmitted to the transimpedance amplifier, the voltage amplification circuit and the amplitude limiting amplification circuit for signal amplification.
2. The four-quadrant detector signal amplification circuit of claim 1, wherein: the transimpedance amplifier is composed of a photodiode D1, a resistor R1, a resistor R2, a resistor Rf, a capacitor Ci, a capacitor CI, a capacitor C2, a capacitor Cf and an operational amplifier A1, bias voltage of the four-quadrant detector is input to the anode of the photodiode D1, the cathode of the photodiode D1 is respectively connected with one ends of the resistor R1, the capacitor Ci and the capacitor CI, the other end of the capacitor CI is connected with the cathode of the input end of the operational amplifier A1, the other ends of the resistor R1 and the capacitor Ci are grounded, one end of the resistor R2 and the capacitor C3 is connected with the anode of the input end of the operational amplifier A1 after being connected in parallel, the other end of the resistor CI is grounded, the resistor Rf and the capacitor Cf are connected with the cathode of the input end of the operational amplifier A1 and the two ends.
3. The four-quadrant detector signal amplification circuit of claim 2, wherein: the voltage amplification circuit comprises a high-speed operational amplifier D2, a resistor R12 to a resistor R15, a capacitor C34 to a capacitor C41, the model of the high-speed operational amplifier D2 is ADA4899, the output end of the operational amplifier A1 is connected with the anode of the input end of the high-speed operational amplifier D1, the anode of the input end of the high-speed operational amplifier D2 is grounded through a resistor R15, the resistor R12, a resistor R13 and the capacitor C34 form a feedback network circuit, one end of the resistor R34 and the capacitor C34 is connected with the feedback end of the high-speed operational amplifier D34 after being connected in parallel, the other end of the resistor R34 and the cathode of the input end of the high-speed operational amplifier D34 are respectively connected with the anode of the resistor R34 and the cathode of the input end of the high-speed operational amplifier D34, one end of the capacitor C34, one end of the resistor R34 and the output end of the anode of the operational amplifier D34 are connected with the operational amplifier D34, one end, The other end of the resistor R13, the capacitor C35, the capacitor C36, the capacitor C38 and the capacitor C41 are grounded, and the output end of the operational amplifier D2 is connected with the amplitude limiting amplifying circuit through the capacitor C37.
4. The four-quadrant detector signal amplification circuit of claim 1, wherein: the amplitude limiting amplifying circuit comprises a broadband high-gain voltage limiting amplifier U3, a resistor R25 to a resistor R33, a capacitor C61 to a capacitor C67 and a SAM joint, the broadband high-gain voltage limiting amplifier U3 is in an OPA699 model, one end of the resistor R27 and the capacitor C62 after being connected in parallel is connected with the negative pole of the input end of the broadband high-gain voltage limiting amplifier U3 and one end of the resistor R28, the other end of the resistor R3 is connected with the output end of the broadband high-gain voltage limiting amplifier U3, one ends of the resistor R29, the capacitor C65, the capacitor C66 and the resistor R32 are connected with the negative pole of the voltage end of the broadband high-gain voltage limiting amplifier U3, the other end of the resistor R3, one end of the resistor R3 and one end of the capacitor C3 are connected with the high-potential end of the broadband high-gain voltage limiting amplifier U3, one ends of the positive pole of the resistor R3, the capacitor R3 and one end of the capacitor C3 are connected with the high-potential voltage limiting amplifier U3, the output end of the broadband high-gain voltage limiting amplifier U3 is connected with the SAM connector through a resistor R30, one end of the resistor R31 is connected with a resistor R29, and the other ends of the resistor R31, the resistor R28, the resistor R25, the resistor R33, the capacitor C61, the capacitor C63 and the capacitor C67 are grounded.
5. The four-quadrant detector signal amplification circuit of claim 2, wherein: the resistor R1 is a current-limiting resistor, the capacitor Ci is a parasitic input total capacitor, the capacitor CI is an alternating current coupling capacitor, the noise voltage gain of the operational amplifier A1 in the low frequency band is 1+ the value of the resistor Rf/the value of the resistor R1, and the noise voltage gain of the operational amplifier A1 in the high frequency band is 1+ (the value of the capacitor Ci// the value of the capacitor Cl)/the value of the capacitor Cf.
6. The four-quadrant detector signal amplification circuit of claim 1, wherein: still include power supply circuit and with the low noise voltage stabilizing circuit that power supply circuit connects for provide the power for signal amplification circuit, power supply circuit includes that the model is LT1931 negative output voltage regulator and the model is MP1593 step-down power module, the negative output voltage regulator is used for converting outside 12V mains voltage into-6V voltage output, step-down power module is used for converting outside 12V mains voltage into 5V voltage output, low noise voltage stabilizing circuit adopts the model to be the linear voltage regulator of low pressure drop of Tps7a4700 and Tps7a3301, carries out the steady voltage and to-6V voltage steady voltage to-5V voltage that negative output voltage regulator exported respectively to the 5V voltage of step-down power module output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920561411.6U CN210405235U (en) | 2019-04-24 | 2019-04-24 | Signal amplification circuit of four-quadrant detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920561411.6U CN210405235U (en) | 2019-04-24 | 2019-04-24 | Signal amplification circuit of four-quadrant detector |
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| Publication Number | Publication Date |
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| CN210405235U true CN210405235U (en) | 2020-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920561411.6U Expired - Fee Related CN210405235U (en) | 2019-04-24 | 2019-04-24 | Signal amplification circuit of four-quadrant detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114894305A (en) * | 2022-04-28 | 2022-08-12 | 西北核技术研究所 | Wide-range detection circuit and detection method for output signal of photoelectric detector |
-
2019
- 2019-04-24 CN CN201920561411.6U patent/CN210405235U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114894305A (en) * | 2022-04-28 | 2022-08-12 | 西北核技术研究所 | Wide-range detection circuit and detection method for output signal of photoelectric detector |
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