Extended ADC sampling equipment based on multichannel analog switch and optical module

Abstract

The utility model belongs to the technical field of optical module control, and particularly relates to an expansion ADC sampling device based on a multichannel analog switch and an optical module, the optical module comprises the ADC sampling device, the ADC sampling device is connected with the output end of the multichannel analog switch through a filter circuit, and an MCU and the multichannel analog switch are both connected with a power supply circuit; a plurality of I / O ports of the MCU are sequentially connected with a plurality of channel selection control ports of the multi-channel analog switch, and the multi-channel analog switch is provided with a plurality of input ends which are connected with a to-be-sampled end. According to the method, an expansion ADC sampling circuit is formed through the arrangement of a multi-channel analog switch, data of a plurality of to-be-sampled ends are collected through one ADC sampling channel, and then ADC port resources of the MCU are greatly saved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical module control, in particular to an extended ADC sampling device and an optical module based on a multi-channel analog switch. Background Art

[0002] The current silicon photonics optical module, with its low cost, low power consumption and high integration, has shown great advantages and broad application prospects in today's big data era. According to the principle of silicon photonics technology, the module needs to collect and monitor the output power of the laser, the input power before the silicon photonic modulator, the output power after the silicon photonic modulator and other necessary monitoring quantities, so the required ADC (analog-to-digital converter) resources are relatively large. The existing technology solves the problem of ADC resource shortage of MCU (microcontroller unit) by using external ADC chips; however, external ADC chips will increase the design cost, and some ADC chips require external ADC reference voltage, so additional voltage stabilization circuits and filtering circuits are required, which increases the complexity of circuit design.

[0003] The purpose of the present invention is to solve the problem of ADC resource shortage without increasing additional cost and design complexity. Utility Model Content

[0004] The purpose of the utility model is to provide an extended ADC sampling device and an optical module based on a multi-channel analog switch to solve the problem of ADC resource shortage of a silicon optical module MCU chip.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] In a first aspect, an extended ADC sampling device based on a multi-channel analog switch is provided, including an MCU, a multi-channel analog switch, a filtering circuit, and a power supply circuit; an ADC port of the MCU is connected to an output end of the multi-channel analog switch through a filtering circuit, and the MCU and the multi-channel analog switch are both connected to the power supply circuit;

[0007] The multiple IO ports of the MCU are connected to the multiple channel selection control ports of the multi-channel analog switch in sequence. The multi-channel analog switch has multiple input terminals, and the input terminals are connected to the terminals to be sampled.

[0008] Furthermore, the filtering circuit includes a resistor and a first capacitor; one end of the resistor is connected to the ADC port of the MCU, and the other end is connected to the output end of the multi-channel analog switch; one end of the first capacitor is connected between the resistor and the ADC port, and the other end is grounded.

[0009] Furthermore, the power supply circuit includes a power supply end and a first power supply circuit and a second power supply circuit connected to the output end of the power supply end, the first power supply circuit includes a second capacitor and a third capacitor in parallel; one end of the first power supply circuit is connected to a connecting line between the output end of the power supply end and the MCU power input end, and the other end is grounded.

[0010] Furthermore, the second power supply circuit includes a magnetic bead, a fourth capacitor and a fifth capacitor, and the output end of the power supply is also connected to the power input end of the multi-channel analog switch through the magnetic bead; the fourth capacitor and the fifth capacitor are connected in parallel, one end of the fourth capacitor and the fifth capacitor is connected to the connecting line between the magnetic bead and the multi-channel analog switch, and the other end is grounded.

[0011] Furthermore, the output voltage of the power supply circuit is 3.3V.

[0012] In a second aspect, an optical module is provided, comprising the above-mentioned extended ADC sampling device based on a multi-channel analog switch; the input end of the multi-channel analog switch is connected to the end to be sampled in the optical module.

[0013] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0014] The utility model forms an extended ADC sampling circuit through the setting of a multi-channel analog switch, realizes the collection of data of multiple terminals to be sampled through one ADC sampling channel, and thus greatly saves ADC port resources of the MCU. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A circuit diagram of an extended ADC sampling device provided in Embodiment 1 of the present utility model;

[0016] Figure 2 A schematic diagram of the working process of the extended ADC sampling device provided in Example 1 of the utility model;

[0017] Icon: 1-first capacitor, 2-second capacitor, 3-third capacitor, 4-fourth capacitor, 5-fifth capacitor, 6-magnetic bead. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Silicon photonics optical modules require a large amount of real-time monitoring, which leads to a shortage of ADC resources in the MCU. The prior art generally solves the problem of ADC resource shortage in the MCU by using an external ADC chip; however, the design cost of the external ADC chip is relatively high, and the ADC chip requires an external ADC reference voltage, so an additional voltage stabilization circuit and a filter circuit are required, which increases the complexity of the circuit design. Based on this, the present application hopes to alleviate the problem of ADC resource shortage in the MCU without increasing additional costs and design complexity. The specific design scheme is as follows.

[0020] Example 1

[0021] In order to solve the above problems, the utility model provides an extended ADC sampling device based on a multi-channel analog switch, which includes an MCU, a multi-channel analog switch, a filtering circuit and a power supply circuit.

[0022] like Figure 1 As shown, the ADC port of the MCU is connected to the output end of the multi-channel analog switch through a filter circuit, and the filter circuit includes a resistor and a first capacitor; one end of the resistor is connected to the ADC port of the MCU, and the other end is connected to the output end of the multi-channel analog switch; one end of the first capacitor is connected between the resistor and the ADC port, and the other end is grounded. The purpose of setting the filter circuit here is to eliminate interference between sampling channels and to protect the ADC port of the MCU; thereby making the ADC sampling more accurate.

[0023] The power supply circuit includes a power supply end and a first power supply circuit and a second power supply circuit connected to the output end of the power supply end. The first power supply circuit includes a second capacitor and a third capacitor in parallel; the second capacitor and the third capacitor are set to effectively filter the noise output by the power supply end, ensure the purity of the power supply, and reduce the interference to the MCU. One end of the first power supply circuit is connected to the connecting line between the output end of the power supply end and the power input end of the MCU, and the other end is grounded. The second power supply circuit includes a magnetic bead, a fourth capacitor and a fifth capacitor, and the output end of the power supply end is also connected to the power input end of the multi-channel analog switch through a magnetic bead; it can be understood that the setting of the magnetic bead can suppress the high-frequency noise and spike interference of the power supply end, absorb electrostatic pulses, improve the purity and stability of the power supply, and ensure the stable operation of the multi-channel analog switch. The fourth capacitor and the fifth capacitor are connected in parallel, and the setting of the fourth capacitor and the fifth capacitor can effectively filter the noise output by the power supply end, ensure the purity of the power supply, and further reduce the interference to the multi-channel analog switch; one end of the fourth capacitor and the fifth capacitor is connected to the connecting line between the magnetic bead and the multi-channel analog switch, and the other end is grounded.

[0024] From the above, it can be seen that the MCU and the multi-channel analog switch are both connected to the power supply circuit, and the output end of the power supply circuit is provided with an anti-interference circuit setting to reduce interference to the device and improve the operation stability of the device; when the extended ADC sampling device in this application is applied to a silicon photonic module, the power supply of the power supply circuit of the extended ADC sampling device comes from the 3.3V power supply in the optical module.

[0025] In order to select the sampling channel, the multiple IO ports of the MCU are connected to the multiple channel selection control ports of the multi-channel analog switch in a one-to-one correspondence. The channel selection of the multi-channel analog switch is realized through the high and low combination of the level output of the IO port of the MCU, and then the analog quantity of the corresponding end to be sampled is collected. The multi-channel analog switch has multiple input ends, which are connected to the end to be sampled. The analog quantity of the end to be sampled corresponding to the channel can be collected by selecting the corresponding channel. It can be understood that when the extended ADC sampling device is used in a silicon optical module, the monitoring data to be sampled includes but is not limited to the laser output light power, the silicon optical modulator front input light power, and the silicon optical modulator rear output light power.

[0026] The above is a detailed description of the results of the extended ADC sampling device disclosed in the utility model. In order to facilitate understanding of how it collects data from multiple sampling terminals through one ADC sampling channel to achieve the purpose of saving ADC port resources of the MCU, the following will describe its working process in detail.

[0027] When the ADC port of the MCU starts to collect data, since the ADC of the MCU uses the charging and discharging of capacitors to achieve voltage collection and the signal voltage collected by each ADC is different, after the multi-channel analog switch switches the channel, the capacitor charging and discharging phenomenon will occur due to the voltage difference before and after the switching, resulting in voltage instability. Therefore, in order to ensure the stable operation of the sampling device, it is necessary to set the ADC stabilization time. When the voltage is stable, analog data collection is performed. After the data collection of the current sampling channel is completed, the MCU controls the multi-channel analog switch to select the next sampling channel, and collects in sequence, thereby completing the data collection of all the ends to be sampled.

[0028] The specific workflow is as follows: Figure 2 As shown. First, the MCU sets the ADC stabilization time, assuming that the number of channels of the multi-channel analog switch is N, the current channel is i, and the initial value of i is 1; the MCU starts to determine whether i is less than or equal to N. When i is less than or equal to N, the MCU controls the multi-channel analog switch to select channel i, and waits after the selection is completed. The waiting time is the ADC stabilization time. After the waiting time is reached, the ADC collects the information to be sampled of the channel. After the sampling is completed, i is assigned a value of i+1. It is determined again whether the current i is less than or equal to N, until i is greater than N, the ADC sampling ends.

[0029] Through the above workflow, the utility model realizes the data collection of multiple sampling terminals in turn through one ADC sampling channel, thereby saving the ADC port resources of the MCU.

[0030] Example 2

[0031] In order to solve the problem that the existing silicon photonic modules need to monitor a lot of data, but the ADC resources of the photonic module MCU are insufficient. The photonic module provided by the utility model includes the extended ADC sampling device in Example 1; the input end of the multi-channel analog switch in the extended ADC sampling device is connected to the end to be sampled in the photonic module. The MCU controls the channel selection of the multi-channel analog switch, and then obtains the data to be sampled of the end to be sampled connected to the multiple channels in turn; thereby solving the problem of insufficient ADC resources of the photonic module MCU.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An extended ADC sampling device based on a multi-channel analog switch, characterized in that: It includes an MCU, a multi-channel analog switch, a filter circuit and a power supply circuit; the ADC port of the MCU is connected to the output end of the multi-channel analog switch through the filter circuit, and the MCU and the multi-channel analog switch are both connected to the power supply circuit; The multiple IO ports of the MCU are connected to the multiple channel selection control ports of the multi-channel analog switch in sequence. The multi-channel analog switch has multiple input terminals, and the input terminals are connected to the terminals to be sampled.

2. The extended ADC sampling device based on a multi-channel analog switch according to claim 1, characterized in that: The filtering circuit includes a resistor and a first capacitor; one end of the resistor is connected to the ADC port of the MCU, and the other end is connected to the output end of the multi-channel analog switch; one end of the first capacitor is connected between the resistor and the ADC port, and the other end is grounded.

3. The extended ADC sampling device based on a multi-channel analog switch according to claim 1, characterized in that: The power supply circuit includes a power supply end and a first power supply circuit and a second power supply circuit connected to the output end of the power supply end. The first power supply circuit includes a second capacitor and a third capacitor connected in parallel. One end of the first power supply circuit is connected to a connecting line between the output end of the power supply end and the MCU power input end, and the other end is grounded.

4. The extended ADC sampling device based on a multi-channel analog switch according to claim 3, characterized in that: The second power supply circuit includes a magnetic bead, a fourth capacitor and a fifth capacitor, and the output end of the power supply is also connected to the power input end of the multi-channel analog switch through the magnetic bead; the fourth capacitor and the fifth capacitor are connected in parallel, one end of the fourth capacitor and the fifth capacitor is connected to the connecting line between the magnetic bead and the multi-channel analog switch, and the other end is grounded.

5. The extended ADC sampling device based on a multi-channel analog switch according to any one of claims 1 to 4, characterized in that: The output voltage of the power supply circuit is 3.3V.

6. An optical module, characterized in that: It comprises an extended ADC sampling device based on a multi-channel analog switch as described in any one of claims 1 to 5; the input end of the multi-channel analog switch is connected to the end to be sampled in the optical module.

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