CN117213534A - Photoelectric detection circuit and method integrating photoelectric detector and optical power meter - Google Patents
Photoelectric detection circuit and method integrating photoelectric detector and optical power meter Download PDFInfo
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Abstract
The application provides a photoelectric detection circuit and a photoelectric detection method for integrating a photoelectric detector and an optical power meter; the circuit comprises: the photodiode receives an optical signal outside the circuit, converts the optical signal into a photocurrent signal and outputs the photocurrent signal; the group-crossing amplifier is electrically connected with the photodiode and is used for receiving the photocurrent signal, converting the photocurrent signal into a voltage signal, and outputting a primary amplified signal after primary amplification of the voltage signal; the double-channel track operational amplifier is electrically connected with the span group amplifier and is used for receiving the primary amplified signal and converting the primary amplified signal into a first electric signal and a second electric signal which are mutually incoherent; the optical power meter is electrically connected with the dual-channel track operational amplifier and is used for receiving the first electric signal, amplifying the first electric signal and then outputting a target voltage signal; and the photoelectric detector is electrically connected with the double-channel track operational amplifier and is used for receiving the second electric signal, amplifying the second electric signal and obtaining the waveform of the amplified second electric signal.
Description
Technical Field
The embodiment of the application relates to the technical field of photoelectric detection, in particular to a photoelectric detection circuit and a photoelectric detection method integrating a photoelectric detector and an optical power meter.
Background
The current photoelectric detection circuit mainly adopts a logarithmic amplifier to carry out primary amplification, but the logarithmic amplifier has the characteristics that: the amplification factor and the input voltage are in an exponential relation point, the output of the photoelectric detector is the waveform of the voltage signal, and based on the output, the logarithmic amplifier can deform the waveform, and further, an amplification structure for performing logarithmic amplification cannot be well combined with the photoelectric detection circuit.
Based on this, a solution is needed that can combine to eliminate waveform distortion, so that the optical power meter and photodetector combine well.
Disclosure of Invention
In view of the above, an object of the present application is to provide a photoelectric detection circuit and method for integrating a photoelectric detector and an optical power meter.
Based on the above object, the present application provides a photodetection circuit integrating a photodetector and an optical power meter, comprising:
a photodiode configured to receive an optical signal outside the circuit, convert the optical signal into a photocurrent signal, and output the photocurrent signal;
the group-crossing amplifier is electrically connected with the photodiode and is configured to receive the photocurrent signal, convert the photocurrent signal into a voltage signal, and output a primary amplified signal after primary amplification of the voltage signal;
a dual channel rail operational amplifier electrically connected to the cross-bank amplifier and configured to receive the primary amplified signal and to convert the primary amplified signal into first and second electrical signals that are mutually incoherent;
the optical power meter is electrically connected with the dual-channel track operational amplifier and is configured to receive the first electric signal, amplify the first electric signal and then output a target voltage signal;
and the photoelectric detector is electrically connected with the dual-channel track operational amplifier and is configured to receive the second electric signal, amplify the second electric signal and obtain the waveform of the amplified second electric signal.
Further, the photodiode includes:
a positive electrode electrically connected to the trans-bank amplifier and configured to input a photocurrent signal to the trans-bank amplifier;
and the negative electrode is configured to be connected with a forward bias voltage and filter the forward bias voltage through a capacitor.
Further, a group-crossing amplifier comprising:
a first positive input terminal configured to be grounded through a pull-down resistor;
a first inverting input coupled to the positive electrode and configured to receive the photocurrent signal;
the first positive voltage input end is configured to be connected with a first forward voltage through a pull-up resistor;
a first negative voltage input configured to be connected to a first reverse voltage through a pull-down resistor and to ground;
the first output end is connected with the reverse input end through a feedback resistor and a capacitor, is connected with the dual-channel track operational amplifier, and is configured to output the primary amplified signal.
Further, a dual channel rail op amp, comprising:
a channel forward input and a channel forward input, each coupled to the first output and each configured to receive the primary amplified signal;
a second positive voltage input configured to be connected to a second forward voltage through a pull-up resistor;
a second negative voltage input configured to be connected to a second reverse voltage through a pull-down resistor;
a channel output connected to the optical power meter and configured to output the first electrical signal;
a two-channel output connected to the photodetector and configured to output the second electrical signal;
a channel inverting input configured such that the channel output is connected;
a two-channel inverting input configured to be connected to the two-channel output.
Further, the optical power meter includes:
the first two-stage operational amplifier is connected with the output end of the one channel and is configured to receive the first electric signal, carry out two-stage amplification on the first electric signal and output the target voltage signal;
a digitally controlled analog switch connected to the first secondary operational amplifier and configured to regulate the first electrical signal to the target voltage signal;
an analog-to-digital converter, coupled to the first secondary operational amplifier, and configured to collect the target voltage signal.
Further, the first two-stage operational amplifier includes:
a channel two-stage inverting input connected to the channel output and configured to receive the first electrical signal;
a channel secondary positive voltage input configured to access a third forward voltage;
a channel two-stage output connected to the analog-to-digital converter and configured to output the target voltage signal to the analog-to-digital converter;
the one-channel secondary output end and the one-channel secondary reverse input end are also connected with the numerical control analog switch and are both configured to be connected with a resistor in the numerical control analog switch;
a channel ground configured to be grounded;
and the second-stage positive input end of the channel is connected with the grounding end.
Further, the numerical control analog switch includes:
a plurality of feedback resistors with different resistance values, each feedback resistor is connected with the one-channel two-stage reverse input end, and each feedback resistor is configured to adjust the amplification factor of the first electric signal;
each numerical control switch is correspondingly connected with one feedback resistor, and each numerical control switch is configured to control the on-off of the corresponding feedback resistor and the one-channel two-stage reverse input end.
Further, the photodetector includes:
and the second-stage operational amplifier is connected with the two-channel output end and is configured to carry out second-stage amplification on the second electric signal and output the waveform of the second electric signal after the second stage amplification.
Further, the second-stage operational amplifier includes:
a two-channel second-stage output configured to output a second electrical signal amplified by the second stage;
the two-channel second-stage reverse input end is connected with the two-channel output end and is configured to be connected with the second electric signal;
the two-channel secondary positive input end is configured to be grounded through a pull-down resistor;
the two-channel secondary positive voltage input end is configured to be connected with a fourth reverse voltage through the filter capacitor;
the two-channel secondary negative voltage input end is connected with the two-channel secondary positive voltage input end and is configured to be connected with a fourth forward voltage through a filter capacitor.
Based on the same inventive concept, the application also provides a photoelectric detection method which is applied to the photoelectric detection circuit of the integrated photoelectric detector and the optical power meter; the method comprises the following steps:
enabling a photodiode to receive an optical signal outside the circuit, converting the optical signal into a photocurrent signal and outputting the photocurrent signal;
enabling the group-crossing amplifier to receive the photocurrent signal, converting the photocurrent signal into a voltage signal, and outputting a primary amplification signal after primary amplification of the voltage signal;
enabling the double-channel track operational amplifier to receive the primary amplified signal and convert the primary amplified signal into a first electric signal and a second electric signal which are mutually incoherent;
the optical power meter receives the first electric signal, amplifies the first electric signal and outputs a target voltage signal;
and enabling the photoelectric detector to receive the second electric signal, amplifying the second electric signal, and obtaining the waveform of the amplified second electric signal.
As can be seen from the above, the photoelectric detection circuit and method for integrating the photoelectric detector and the optical power meter provided by the application combine the photoelectric detector and the optical power meter based on the set span amplifier and the dual-channel track operational amplifier, and when the photoelectric detector and the optical power meter are used for carrying out secondary amplification respectively, the span amplifier is used for carrying out primary amplification, so that the deformation of voltage signal waveforms is avoided when the photoelectric detector carries out secondary amplification, different feedback is connected into the optical power meter, and meanwhile, the phenomenon that the amplified endorsement and the input voltage are in an exponential relation when the optical power meter carries out amplification is avoided, and the output after the secondary amplification of the optical power meter and the output after the secondary amplification of the photoelectric detector can be effectively combined.
Drawings
In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort to those of ordinary skill in the art.
FIG. 1 is a schematic diagram of a photo detection circuit of an integrated photo detector and photo power meter according to an embodiment of the present application;
FIG. 2 is a circuit diagram of a group-crossing amplifier according to an embodiment of the present application;
FIG. 3 is a circuit diagram of a dual channel rail op amp according to an embodiment of the present application;
FIG. 4 is a circuit diagram of an optical power meter according to an embodiment of the present application;
FIG. 5 is a circuit diagram of a photodetector according to an embodiment of the present application;
fig. 6 is a schematic diagram of a photodetection method according to an embodiment of the present application.
Detailed Description
The present application will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
As described in the background section, it is also difficult for the related photodetection circuit to meet the requirements in actual photodetection.
The applicant has found in the implementation of the present application that the main problems associated with the photodetection circuit are: the current photoelectric detection circuit mainly adopts a logarithmic amplifier to carry out primary amplification, but the logarithmic amplifier has the characteristics that: the amplification factor and the input voltage are in an exponential relation point, the output of the photoelectric detector is the waveform of the voltage signal, and based on the output, the logarithmic amplifier can deform the waveform, and further, an amplification structure for performing logarithmic amplification cannot be well combined with the photoelectric detection circuit.
Based on this, one or more embodiments of the present application provide a photodetection circuit that integrates a photodetector and an optical power meter.
Embodiments of the present application are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, a photodetection circuit integrating a photodetector 104 and an optical power meter 105 according to an embodiment of the present application includes: a photodiode 101, a trans-bank amplifier 102, a dual channel rail op amp 103, a photodetector 104, and an optical power meter 105.
In this embodiment, as shown in fig. 1, a photodiode 101 is electrically connected to a span amplifier 102, the span amplifier 102 is electrically connected to a dual-channel rail operational amplifier 103, and the dual-channel rail operational amplifier 103 is electrically connected to a photodetector 104 and an optical power meter 105.
In the present embodiment, the photodiode 101 is used for switching in an optical signal from outside the photodetection circuit.
Further, after the photodiode 101 is connected to the photoelectric signal, the photoelectric signal may be converted into a photocurrent signal, and the photocurrent signal may be output to the trans-group amplifier 102.
In this embodiment, the trans-group amplifier 102 may convert the photocurrent signal into a voltage signal after the photocurrent signal is connected from the photodiode 101, that is, the conversion of current into voltage is achieved.
Further, the group-crossing amplifier 102 may amplify the converted voltage signal, where the amplifying operation is the first stage of amplifying in the present embodiment, and uses the signal obtained after amplifying as a primary amplified signal.
Further, the cross-bank amplifier 102 outputs the primary amplified signal to the dual-channel track operational amplifier 103.
In this embodiment, the dual-channel rail operational amplifier 103, that is, the dual-channel rail operational amplifier, can convert a single-channel electrical signal into two incoherent electrical signals.
Based on this, the dual channel track operational amplifier 103 may tap in the primary amplified signal from the span amplifier 102 and divide the primary amplified signal into a first electrical signal and a second electrical signal, and the first electrical signal is output to the optical power meter 105 and the second electrical signal is output to the photodetector 104.
Wherein the first electrical signal and the second electrical signal may both be voltage signals.
In the present embodiment, as shown in fig. 1, a digitally controlled analog switch 1051 and a first secondary amplifier 1052 are provided in the optical power meter 105.
Wherein a digitally controlled analog switch 1051 is connected to a first secondary amplifier 1052.
Further, the optical power meter 105 may access the first electrical signal from the dual channel rail op amp 103 and amplify the first electrical signal with the first secondary amplifier 1052.
Further, a digitally controlled analog switch 1051 coupled to the first secondary amplifier 1052 may adjust the first secondary amplifier 1052 to achieve different amplification of the first electrical signal.
Further, the first secondary amplifier 1052 may amplify the first electric signal according to the amplification factor set in the digitally controlled analog switch 1051, and obtain a target voltage signal and output the target voltage signal.
In the present embodiment, as shown in fig. 1, a secondary amplifier is provided in the photodetector 104.
Further, the photodetector 104 may access the second electrical signal from the dual channel rail op amp 103 and amplify the second electrical signal with the second secondary amplifier 1041.
The second stage amplifier 1041 may retain and output the complete waveform of the amplified second electrical signal.
In another embodiment of the present application, taking the photodiode VT shown in fig. 2 as an example, the photodiode VT includes: positive electrode P, negative electrode P, and ground GND.
Wherein the positive pole P is connected with the trans-bank amplifier TIA.
Based on this, the photodiode VT may output its photocurrent signal to the trans-group amplifier TIA through the positive electrode P.
Further, as shown in fig. 1, the negative electrode N is connected to a forward bias voltage of +v.
Parallel capacitors C and C0 are arranged between the negative electrode N and the forward bias voltage +V, and the forward bias voltage +V is grounded through the parallel capacitors C and C0 so as to filter the forward bias voltage +V.
Further, as shown in fig. 1, the ground GND is for grounding.
In another embodiment of the present application, taking the group-spanning amplifier TIA shown in fig. 2 as an example, the group-spanning amplifier TIA includes: a first positive input terminal +in, a first negative input terminal-IN, a first positive voltage input terminal v+, a first negative voltage input terminal V-, and a first output terminal OUT.
The first inverting input-IN is connected to the positive pole pd+ of the photodiode VT IN the previous embodiment and is used to switch IN the photocurrent signal.
IN this embodiment, the first positive input terminal +in is connected to a pull-down resistor R1, and is grounded through the pull-down resistor R1.
Further, two capacitors C1 and C2 are arranged in parallel with the pull-down resistor R1 and are grounded through the capacitors C1 and C2, so that the parallel capacitors C1 and C2 can filter the accessed photocurrent signals to eliminate high and low frequency noise therein and filter out direct current ripple waves.
In this embodiment, the first positive voltage input terminal v+ is connected to a pull-up resistor R2, and is connected to a voltage level ofIs set in the first forward voltage of the battery.
Further, two capacitors C3 and C4 are provided in parallel with the pull-up resistor R2 and are grounded through C3 and C4, whereby the parallel capacitors C3 and C4 can filter the first forward voltage that is being supplied.
In the present practiceIn the embodiment, the first negative voltage input terminal V-is connected with a pull-down resistor R3, and is connected with a voltage of the same magnitude as the pull-down resistor R3Is a first reverse voltage of the first voltage source.
Further, a capacitor C5 is provided in parallel with the pull-down resistor R3, and is grounded through the capacitor C5.
In this embodiment, the group-crossing amplifier may convert the photocurrent signal into a voltage signal, and amplify the voltage signal into a primary amplified signal, and the first output terminal OUT in fig. 2 may output the amplified primary amplified signal.
Further, the first output OUT is also connected to the first inverting input-IN through a feedback resistor Rf, and a capacitor Cf is provided IN parallel with the feedback resistor Rf.
In another embodiment of the present application, taking the dual channel rail operational amplifier ADA shown in fig. 3 as an example, the dual channel rail operational amplifier ADA includes: one channel forward input In1+, two channel forward input In2+, second positive voltage input VS+, second negative voltage input VS-, one channel output OUT1, two channel output OUT2, one channel reverse input IN1-, and two channel reverse input IN2-.
IN this embodiment, the one-channel forward input terminal in1+ and the two-channel forward input terminal in2+ are each connected to the first output terminal OUT of the trans-bank amplifier TIA IN the previous embodiment.
Further, the one-channel forward input terminal in1+ and the two-channel forward input terminal in2+ may each be connected to a primary amplified signal.
It can be seen that the dual channel rail operational amplifier ADA can further convert the single-channel primary amplified signal into two incoherent electrical signals.
Specifically, the dual-channel rail operational amplifier ADA is divided into two processing channels, which are respectively: the system comprises a channel and two channels, wherein primary amplified signals respectively connected with a forward input end In1+ of the channel and a forward input end In2+ of the channel are respectively processed, and a first electric signal corresponding to the channel and a second electric signal corresponding to the two channels are generated; wherein the first electrical signal and the second electrical signal may both be voltage signals.
In this embodiment, the second positive voltage input terminal vs+ is connected to a pull-up resistor R4, and is connected to a voltage level ofIs provided.
Further, two capacitors C6 and C7 are arranged in parallel with the pull-up resistor R4 and are grounded through C6 and C7, whereby the parallel capacitors C6 and C7 can filter the second forward voltage that is connected.
In the present embodiment, the second negative voltage input terminal VS is connected to a pull-down resistor R5, and is connected to a voltage level ofIs a second reverse voltage of the first reverse voltage.
Further, two capacitors C8 and C9 are arranged in parallel with the pull-down resistor R5 and are grounded through C8 and C9, whereby the parallel capacitors C8 and C9 can filter the second reverse voltage that is connected.
In this embodiment, as shown in fig. 3, a channel output terminal OUT1 is connected to the optical power meter OP, and a channel output terminal OUT2 is connected to the photodetector PD.
Based on this, the one-channel output terminal OUT1 may output the first electrical signal to the optical power meter OP, and the two-channel output terminal OUT2 may output the second electrical signal to the photodetector PD.
Further, as shown IN fig. 3, a channel inversion input terminal IN 1-is connected to a channel output terminal OUT1, and a channel inversion input terminal IN 2-is connected to a channel output terminal OUT 2.
In another embodiment of the present application, taking the optical power meter OP shown in fig. 4 as an example, the optical power meter OP includes: a first two-stage operational amplifier LM, a digital controlled analog switch and an analog-to-digital converter ADC.
In this embodiment, the first secondary operational amplifier LM is connected to a channel of the dual channel rail operational amplifier ADA, and specifically connected to an output end of a channel, so that a first electrical signal can be accessed and amplified secondarily.
Further, after the first secondary operational amplifier LM performs secondary amplification on the first electric signal, a target voltage signal is obtained and output to the analog-to-digital converter ADC.
In this embodiment, the analog-to-digital converter ADC is connected to both the first secondary operational amplifier LM and the digitally controlled analog switch, and can collect the generated target voltage signal from the first secondary operational amplifier LM.
Further, as shown in fig. 5, the first secondary operational amplifier LM is connected to the analog-to-digital converter ADC through a capacitor C17, where the capacitor C17 is grounded, and can perform a function of filtering the target voltage signal output by the first secondary operational amplifier LM, and after filtering, the target voltage signal is transferred to the subsequent analog-to-digital converter ADC.
In this embodiment, the digitally controlled analog switch is connected to the first secondary operational amplifier LM to adjust the amplification factor of the first secondary operational amplifier LM to adjust the first electrical signal to the target voltage signal.
In another embodiment of the present application, taking the optical power meter OP shown in fig. 4 as an example, the first two-stage operational amplifier LM includes: a channel secondary reverse input terminal 1IN-, a channel secondary positive voltage input terminal VCC, a channel secondary output terminal 1OUT, a channel ground terminal GNDlm, and a channel secondary forward input terminal 1in+.
IN the present embodiment, a channel secondary inverting input terminal 1 IN-is connected to a channel output terminal OUT1 of the dual channel rail operational amplifier ADA IN the previous embodiment, and a resistor RL is disposed between the channel secondary inverting input terminal 1 IN-and the channel output terminal OUT 1.
Further, the one-channel two-stage inverting input terminal 1 IN-is also connected to the capacitor C16 and is grounded through the capacitor C16, thereby filtering the DC signal output to the one-channel two-stage inverting input terminal 1 IN-.
In this embodiment, as shown in fig. 5, the one-channel secondary positive voltage input VCC is connected to a third forward voltage with +v.
IN this embodiment, as shown IN fig. 5, a channel ground GNDlm is grounded, and a channel secondary forward input terminal 1in+ is connected to a channel ground GNDlm, that is, a channel secondary forward input terminal 1in+ is also grounded.
IN this embodiment, a channel two-stage output terminal 1OUT and a channel two-stage inverting input terminal 1 IN-are also connected to the NC analog switch.
Based on this, the first secondary operational amplifier LM may be connected to a resistor in the digitally controlled analog switch, and cause the digitally controlled analog switch to adjust the amplification factor of the first electrical signal by adjusting the resistor therein.
In another embodiment of the present application, taking the optical power meter OP shown in fig. 4 as an example, the digitally controlled analog switch includes a plurality of feedback resistors and a plurality of digitally controlled switches.
In this embodiment, the feedback resistor includes: rf1, rf2, rf3, rf4, rf5, rf6, rf7 and Rf8; the resistance value of each feedback resistor may be the same or different.
Further, each feedback resistor is connected IN parallel and is connected to the one-channel two-stage inverting input terminal 1 IN-of the first two-stage operational amplifier LM.
Further, each feedback is correspondingly provided with a numerical control switch, and whether the corresponding feedback resistor is connected with the one-channel secondary reverse input end 1 IN-can be controlled by controlling any numerical control switch.
Further, an interface end IO connected with the one-channel secondary output end 1OUT is also arranged in the numerical control analog switch.
Based on this, the amplification factor of the first two-stage operational amplifier LM can be controlled by adjusting the resistance value of the resistor connected to the one-channel two-stage inverting input terminal 1 IN-.
In another embodiment of the present application, taking the photo detector PD shown in fig. 5 as an example, the photo detector PD includes a second-stage operational amplifier LMH.
In this embodiment, the second-stage operational amplifier LMH is connected to the two-channel output terminal OUT2 in the foregoing embodiment.
Further, the second-stage operational amplifier LMH may access the second electrical signal from the two-channel output terminal OUT2 and secondarily amplify the second electrical signal.
In this embodiment, after the second electric signal is secondarily amplified, the second-stage operational amplifier may retain the waveform of the voltage signal in the foregoing embodiment and output the waveform of the secondarily amplified second electric signal.
In this embodiment, since the first-stage amplification process in the foregoing embodiment is performed using the span-group amplifier, the waveform of the second electric signal output by the second-stage operational amplifier in this embodiment is identical to the waveform of the voltage signal of the span-group amplifier in the foregoing embodiment, and no distortion occurs.
In another embodiment of the present application, taking the photodetector illustrated in fig. 5 as an example, the second stage operational amplifier LMH includes: the two-channel secondary output terminal OUT, the two-channel secondary reverse input terminal-INx, the two-channel secondary forward input terminal +INx, the two-channel secondary positive voltage input terminal vlmh+, and the two-channel secondary negative voltage input terminal Vlmh-.
In this embodiment, the two-channel secondary output terminal OUT may output the second electric signal amplified secondarily in the foregoing embodiment.
As shown in fig. 5, the two-channel secondary output terminal OUT is connected with the interface SMA, and further, the second electrical signal after the secondary amplification may be output to the interface SMA.
In this embodiment, the two-channel two-stage inverting input terminal-INx is connected to the two-channel output terminal OUT2 of the two-channel rail operational amplifier ADA in the foregoing embodiment, and is connected to the second electrical signal.
Further, as shown in fig. 5, the two-channel secondary reverse input terminal-INx is connected with an inductance L, and the two-channel secondary reverse input terminal-INx is also connected with the two-channel secondary output terminal OUT through a feedback resistor Rf 2.
Based on this, the connected inductance L may form an inductance feedback, based on which the connected inductance L may stabilize the gain of the photodetector PD and reduce distortion and noise of the second electrical signal after the second amplification.
Further, a capacitor C10 is further disposed between the two-channel secondary inverting input terminal-INx and the inductor L, and the capacitor C10 can block the accessed dc signal.
Further, a resistor R6 is disposed in parallel with the capacitor C10, as shown in fig. 5, both the capacitor C10 and the resistor R6 are connected to the two-channel two-stage inverting input terminal-INx through a resistor R7, and the two-channel two-stage inverting input terminal-INx is grounded through the resistor R6.
In this embodiment, the two-channel two-stage positive input terminal +inx is connected to a pull-down resistor R8, and is grounded through the pull-down resistor R8.
In this embodiment, the two-channel two-level positive voltage input vlmh+ is connected to a fourth forward voltage with +v.
Further, the two-channel two-stage positive voltage input terminal vlmh+ is further connected to two parallel capacitors C11 and C12, and is grounded through the capacitors C11 and C12, so that the parallel capacitors C11 and C12 can filter the fourth forward voltage.
In this embodiment, the two-channel two-stage negative voltage input Vlmh is connected to a fourth reverse voltage of-V.
Further, the two-channel two-stage negative voltage input Vlmh-is further connected to two parallel capacitors C13 and C14, and is grounded through the capacitors C13 and C14, so that the parallel capacitors C13 and C14 can filter the fourth reverse voltage.
In this embodiment, as shown in fig. 5, the two-channel secondary positive voltage input vlmh+ and the two-channel secondary negative voltage input Vlmh-are also connected through a capacitor C15.
It should be noted that, in various embodiments of the present application, the capacitor used for filtering may also be referred to as a filter capacitor.
Therefore, the photoelectric detection circuit integrating the photoelectric detector and the optical power meter of the embodiment of the application combines the photoelectric detector and the optical power meter based on the set cross-group amplifier and the dual-channel track operational amplifier, and when the photoelectric detector and the optical power meter are used for carrying out secondary amplification respectively, the cross-group amplifier is used for carrying out primary amplification, so that the deformation of voltage signal waveforms is avoided when the photoelectric detector carries out secondary amplification, different feedback is connected in the optical power meter, and meanwhile, the phenomenon that an amplifying endorsement and an input voltage are in an exponential relation when the optical power meter carries out amplification is avoided, and the output after the secondary amplification of the optical power meter and the output after the secondary amplification of the photoelectric detector can be effectively combined.
Based on the same inventive concept, the embodiment of the application also provides a photoelectric detection method corresponding to the circuit of any embodiment.
Referring to fig. 6, the photodetection method is applied to the photodetection circuit of the integrated photodetector and optical power meter in any of the foregoing embodiments, and specifically includes:
step S601, enabling a photodiode to receive an optical signal outside the circuit, converting the optical signal into a photocurrent signal and outputting the photocurrent signal;
step S602, enabling a group-crossing amplifier to receive the photocurrent signal, converting the photocurrent signal into a voltage signal, and outputting a primary amplified signal after primary amplification of the voltage signal;
step S603, enabling the dual-channel track operational amplifier to receive the primary amplified signal and converting the primary amplified signal into a first electric signal and a second electric signal which are mutually incoherent;
step S604, enabling an optical power meter to receive the first electric signal, amplifying the first electric signal and then outputting a target voltage signal;
step S605, enabling the photodetector to receive the second electrical signal, and amplifying the second electrical signal to obtain a waveform of the amplified second electrical signal.
The device of the foregoing embodiment is used for implementing the photoelectric detection circuit of the integrated photoelectric detector and the optical power meter in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described herein.
It should be noted that, the method of the embodiment of the present application may be performed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene, and is completed by mutually matching a plurality of devices. In the case of such a distributed scenario, one of the devices may perform only one or more steps of the method of an embodiment of the present application, the devices interacting with each other to complete the method.
It should be noted that the foregoing describes some embodiments of the present application. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order and there are many other variations of the different aspects of the embodiments of the application as described above, which are not provided in detail for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure embodiments of the present application. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring embodiments of the present application, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present application are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.
The embodiments of the application are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements and the like, which are within the spirit and principles of the embodiments of the application, are intended to be included within the scope of the application.
Claims (10)
1. A photo-detection circuit integrating a photo-detector and an optical power meter, comprising:
a photodiode configured to receive an optical signal outside the circuit, convert the optical signal into a photocurrent signal, and output the photocurrent signal;
the group-crossing amplifier is electrically connected with the photodiode and is configured to receive the photocurrent signal, convert the photocurrent signal into a voltage signal, and output a primary amplified signal after primary amplification of the voltage signal;
a dual channel rail operational amplifier electrically connected to the cross-bank amplifier and configured to receive the primary amplified signal and to convert the primary amplified signal into first and second electrical signals that are mutually incoherent;
the optical power meter is electrically connected with the dual-channel track operational amplifier and is configured to receive the first electric signal, amplify the first electric signal and then output a target voltage signal;
and the photoelectric detector is electrically connected with the dual-channel track operational amplifier and is configured to receive the second electric signal, amplify the second electric signal and obtain the waveform of the amplified second electric signal.
2. The photodetection circuit according to claim 1, wherein the photodiode comprises:
a positive electrode electrically connected to the trans-bank amplifier and configured to input a photocurrent signal to the trans-bank amplifier;
and the negative electrode is configured to be connected with a forward bias voltage and filter the forward bias voltage through a capacitor.
3. The photo detection circuit of claim 2, wherein the cross-group amplifier comprises:
a first positive input terminal configured to be grounded through a pull-down resistor;
a first inverting input coupled to the positive electrode and configured to receive the photocurrent signal;
the first positive voltage input end is configured to be connected with a first forward voltage through a pull-up resistor;
a first negative voltage input configured to be connected to a first reverse voltage through a pull-down resistor and to ground;
the first output end is connected with the reverse input end through a feedback resistor and a capacitor, is connected with the dual-channel track operational amplifier, and is configured to output the primary amplified signal.
4. A photo-detection circuit as claimed in claim 3, wherein the dual channel rail op-amp comprises:
a channel forward input and a channel forward input, each coupled to the first output and each configured to receive the primary amplified signal;
a second positive voltage input configured to be connected to a second forward voltage through a pull-up resistor;
a second negative voltage input configured to be connected to a second reverse voltage through a pull-down resistor;
a channel output connected to the optical power meter and configured to output the first electrical signal;
a two-channel output connected to the photodetector and configured to output the second electrical signal;
a channel inverting input configured such that the channel output is connected;
a two-channel inverting input configured to be connected to the two-channel output.
5. The photodetection circuit according to claim 4, wherein the optical power meter comprises:
the first two-stage operational amplifier is connected with the output end of the one channel and is configured to receive the first electric signal, carry out two-stage amplification on the first electric signal and output the target voltage signal;
a digitally controlled analog switch connected to the first secondary operational amplifier and configured to regulate the first electrical signal to the target voltage signal;
an analog-to-digital converter, coupled to the first secondary operational amplifier, and configured to collect the target voltage signal.
6. The photodetection circuit of claim 5, wherein the first secondary operational amplifier comprises:
a channel two-stage inverting input connected to the channel output and configured to receive the first electrical signal;
a channel secondary positive voltage input configured to access a third forward voltage;
a channel two-stage output connected to the analog-to-digital converter and configured to output the target voltage signal to the analog-to-digital converter;
the one-channel secondary output end and the one-channel secondary reverse input end are also connected with the numerical control analog switch and are both configured to be connected with a resistor in the numerical control analog switch;
a channel ground configured to be grounded;
and the second-stage positive input end of the channel is connected with the grounding end.
7. The photodetection circuit of claim 6, wherein the digitally controlled analog switch comprises:
a plurality of feedback resistors with different resistance values, each feedback resistor is connected with the one-channel two-stage reverse input end, and each feedback resistor is configured to adjust the amplification factor of the first electric signal;
each numerical control switch is correspondingly connected with one feedback resistor, and each numerical control switch is configured to control the on-off of the corresponding feedback resistor and the one-channel two-stage reverse input end.
8. The photodetection circuit of claim 4, wherein the photodetector comprises:
and the second-stage operational amplifier is connected with the two-channel output end and is configured to carry out second-stage amplification on the second electric signal and output the waveform of the second electric signal after the second stage amplification.
9. The photodetection circuit of claim 8, wherein the second-stage operational amplifier comprises:
a two-channel second-stage output configured to output a second electrical signal amplified by the second stage;
the two-channel second-stage reverse input end is connected with the two-channel output end and is configured to be connected with the second electric signal;
the two-channel secondary positive input end is configured to be grounded through a pull-down resistor;
the two-channel secondary positive voltage input end is configured to be connected with a fourth reverse voltage through the filter capacitor;
the two-channel secondary negative voltage input end is connected with the two-channel secondary positive voltage input end and is configured to be connected with a fourth forward voltage through a filter capacitor.
10. A photodetection method characterized by being applied to a photodetection circuit of an integrated photodetector and optical power meter according to any one of claims 1-9;
the method comprises the following steps:
enabling a photodiode to receive an optical signal outside the circuit, converting the optical signal into a photocurrent signal and outputting the photocurrent signal;
enabling the group-crossing amplifier to receive the photocurrent signal, converting the photocurrent signal into a voltage signal, and outputting a primary amplification signal after primary amplification of the voltage signal;
enabling the double-channel track operational amplifier to receive the primary amplified signal and convert the primary amplified signal into a first electric signal and a second electric signal which are mutually incoherent;
the optical power meter receives the first electric signal, amplifies the first electric signal and outputs a target voltage signal;
and enabling the photoelectric detector to receive the second electric signal, amplifying the second electric signal, and obtaining the waveform of the amplified second electric signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310931860.6A CN117213534A (en) | 2023-07-26 | 2023-07-26 | Photoelectric detection circuit and method integrating photoelectric detector and optical power meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310931860.6A CN117213534A (en) | 2023-07-26 | 2023-07-26 | Photoelectric detection circuit and method integrating photoelectric detector and optical power meter |
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| Publication Number | Publication Date |
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| CN117213534A true CN117213534A (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310931860.6A Pending CN117213534A (en) | 2023-07-26 | 2023-07-26 | Photoelectric detection circuit and method integrating photoelectric detector and optical power meter |
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| Country | Link |
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| CN (1) | CN117213534A (en) |
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