Project Overview and Analysis
1:14
Analyzing the schematic.
Planning to use tools.
Identifying existing components.
Responding in Chinese.
Linking components cautiously.
Preparing to ask about adding components.
下面是对当前工程中“功率级定位”的核查结果（按你提出的四项：三相桥、门极驱动、母线电容、分流电阻）。本项目为单页原理图，未拆分多页。
功率级元素定位结果
- 三相桥功率级（6×MOSFET/三相桥模块）
- 结果：未找到匹配器件
- 位置/页：当前工程仅一页，未放置
- 门极驱动器（半桥/三相门极驱动）
- 结果：未找到匹配器件
- 位置/页：当前工程仅一页，未放置
- 直流母线电容（DC-Link，大容量低ESR电容并MLCC去耦）
- 结果：未找到典型“母线电容”用途与封装（现有电容均为小容量去耦/补偿）
- 位置/页：当前工程仅一页，未放置
- 分流电阻（母线/相电流取样用低阻分流器）
- 结果：未找到低阻、开尔文引脚类分流电阻
- 位置/页：当前工程仅一页，未放置
与功率级无关但可能混淆的已存在器件（用于本工程的模拟前端与数字系统）
- 高速运放（模拟前端，±6 V 供电）
- 小容量电容（去耦/补偿，非DC-Link）
- 电阻网络（偏置/反馈，非分流取样）
- 数字与外设（与电机控制无关）
结论
- 当前工程（环境辐射记录器示例）未包含你要查找的电机功率级相关器件：三相桥、门极驱动、母线电容与分流电阻均未放置。
需要我在此工程中新建并放置“PMSM三相桥功率级+门极驱动+DC-Link去耦+电流采样（两分流/三分流/母线分流）”模块吗？如果确认，我可以为你准备执行计划并按你的采样方案与功率等级（300 W）放置相应器件与接口。
确认工程不对
按“电机功率”网络找
按封装/器件类型找
定位±6V电源用途
56 days
Is the microcontroller wired correctly?
@copilot Is the microcontroller wired correctly?
2y
Yes, the microcontroller (U3, STM32F030C6T6) appears to be wired correctly. Here are some of the connections:
- VDD pins are connected to the +3.3V power supply (Net 0).
- VSS and VSSA pins are connected to the ground (Net 4).
- I2C1_SCL (PB10) and I2C1_SDA (PB11) are connected to Net 9 and Net 10, respectively, for I2C communication.
- UART1_RX (PA10) and UART1_TX (PA9) are connected to Net 2 and Net 17, respectively, for UART communication.
- SPI1 signals, SCK (PA5), COPI (PA7), CIPO (PA6), and CS (PA4), are connected to their respective nets (Net 26, Net 1, Net 19, and Net 7).
Other control and monitoring pins like PA1, PA2, PA3, PA8, PA11, PA12, and PA13 are also connected appropriately. Overall, the microcontroller appears to be wired correctly based on the provided schematic.
2y
I'm worried about BOOT0, what does that do on the MCU?
2y
BOOT0 is a pin on the STM32F030C6T6 microcontroller used to select the boot mode during the startup process. By setting the BOOT0 pin state (either high or low), you can choose whether the MCU boots from its internal Flash memory, or an alternate boot source like system memory or bootloader for programming/firmware update purposes.
In the provided schematic, BOOT0 is connected to U3:PB8. For normal operation, you would generally connect BOOT0 to ground (low) so that the MCU boots from the internal Flash memory. However, if you ever need to update the firmware or use an alternate memory source, you can control the BOOT0 pin using the GPIO PB8 on the MCU. Keep in mind that this might require additional software configuration to ensure proper functionality.
2y
thanks! I'll tie it low then
2y
You're welcome! Tying BOOT0 low is a good choice for normal operation, as it ensures that the STM32F030C6T6 microcontroller boots from its internal Flash memory. If you need to update firmware or use an alternate memory source in the future, you can always modify the connections and software configuration to account for those changes. If you have any more questions or need further assistance, feel free to ask. Good luck with your project!
2y
4
I just built this circuit and I'm seeing -4V on the output of the op amp cascade...
@copilot I just built this circuit and I'm seeing -4V on the output of the op amp cascade. Any ideas what could've gone wrong?
2y
There could be several reasons for the -4V output on the op-amp cascade. Some possible causes include:
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Incorrect component values: Double-check the resistor and capacitor values in the circuit to ensure they match the schematic.
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Soldering issues: Inspect the solder joints for any shorts or cold solder joints that could affect the circuit performance.
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Damaged components: It's possible that one or more components, such as the op-amps, could be damaged. Verify that the components are functioning correctly.
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Power supply issues: Ensure that the power supply is providing the correct voltage levels to the circuit.
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Oscillation or instability: The op-amp cascade might be oscillating or unstable, causing unexpected output voltages. Check for proper compensation and stability.
I recommend going through these steps to identify and resolve the issue.
2y
i checked all of these and none are the problem. I'm seeing a 500kHz ripple on the output overlayed over the -4V output.
2y
If you're seeing a 500kHz ripple on the output, it could be due to oscillation or noise coupling into the circuit. Here are some suggestions to address this issue:
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Bypass capacitors: Ensure that proper bypass capacitors are placed close to the op-amp power supply pins to filter out high-frequency noise.
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Grounding and layout: Verify that the PCB layout has a proper ground plane and that the signal traces are routed away from noisy components or traces.
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Compensation: Check the op-amp compensation and feedback network to ensure stability. You may need to adjust the component values or add additional components to stabilize the circuit.
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Shielding: If the circuit is sensitive to external noise, consider adding shielding around the op-amp cascade to minimize interference.
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Input filtering: If the noise is coming from the input signal, consider adding a low-pass filter to the input to reduce high-frequency noise.
Investigate these areas to identify and resolve the ripple issue.
2y
what else could be causing the -4V on the output?
2y
One possible cause of the -4V output could be output voltage phase-reversal, which occurs in some op-amps when the input common-mode voltage is exceeded. This issue is typically caused when one of the internal stages of the op-amp no longer has sufficient bias voltage across it and subsequently turns off, causing the output voltage to swing to the opposite rail until the input comes back within the common-mode range. This issue is most often associated with JFET and/or BiFET amplifiers, but some bipolar single-supply amplifiers are also susceptible to it. To address this issue, you may need to ensure that the input common-mode voltage is within the specified limits for the op-amp you are using. Source
2y
5
How can I configure this op amp to get 100dB of gain with 20kHz of bandwidth whi...
@copilot How can I configure this op amp to get 100dB of gain with 20kHz of bandwidth while biasing the input at 4V?
2y
To configure the OPA847 (U5) for a gain of 100 dB (~3162 V/V) at a bandwidth of 20 kHz, you can use a two-stage approach with the input biased at 4V. Here's how you can do it:
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First, determine two gains to reach a total gain of 100 dB. For example, you can choose two gains of 50 dB each (316.2 V/V).
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For both stages, you can use a non-inverting amplifier configuration. To set the gain of each stage to 50 dB, you'll need to select appropriate resistor values for the feedback resistors Rf and Rin.
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The gain in a non-inverting amplifier configuration is determined by the resistors' ratio: Gain = 1 + (Rf/Rin). To get a gain of 316.2 V/V, you can choose Rf at 316.2 kΩ and Rin at 1 kΩ.
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To bias the input at 4V, you can create a voltage divider using two equal-value resistors (e.g., 10 kΩ) between the V+ rail (assumed to be 8V) and GND. The midpoint of the voltage divider can be AC-coupled to the non-inverting input of the first-stage op-amp using a series capacitor (e.g., using a 1 µF capacitor).
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The 20 kHz bandwidth can be set by a low-pass filter at the output of the second stage using an RC-filtro (Rf and Cf). The cutoff frequency is given by fc = 1 / (2π * Rf * Cf). For a 20 kHz bandwidth and using Rf = 316.2 kΩ, Cf ≈ 25 pF. You can select the nearest capacitor value available.
Note that this design assumes the OPA847 has sufficient bandwidth and can provide the required output voltage swing for your application. Be sure to check the datasheet for the specific device to ensure its performance characteristics meet your requirements.
2y
would the OPA847 have enough bandwidth to achieve 50dB of gain at 20kHz?
2y
The OPA847 has a gain-bandwidth product (GBP) of 3.9 GHz. To determine if the op-amp has sufficient bandwidth to provide 50 dB of gain at 20 kHz, you can calculate the required bandwidth for the desired gain and compare it to the GBP.
First, let's convert the gain from dB to a linear value:
Gain (linear) = 10^(Gain (dB) / 20) = 10^(50 / 20) = 316.2 V/V
Now, we can calculate the required bandwidth for the gain:
Required bandwidth = Gain * Signal bandwidth = 316.2 * 20,000 Hz = 6.324 MHz
The required bandwidth (6.324 MHz) is much lower than the OPA847's GBP (3.9 GHz), so the OPA847 should have sufficient bandwidth to achieve 50 dB of gain at 20 kHz. However, you should also ensure that the output voltage swing and other device characteristics meet your requirements by referring to the device's datasheet.
2y
thanks copilot!
2y
You're welcome, Mark! If you have any more questions or need further assistance, please don't hesitate to ask. I'm here to help!
2y
@copilot, I just noticed my rail is 6V. How would I make a voltage divider to get 4V out?
2y
To create a voltage divider that outputs 4V with a 6V input, you'll need to choose two resistors with the right ratio. The output voltage (Vout) for a voltage divider is determined by the following equation:
Vout = Vin * (R2 / (R1 + R2)),
where Vin is the input voltage (6V), R1 is the resistor connected to Vin, and R2 is the resistor connected to ground (GND). To find the ratio R2/(R1+R2) that will result in a 4V output:
R2 / (R1 + R2) = 4V / 6V = 2/3 ≈ 0.6667.
You can choose numerous resistor combinations to achieve this ratio, but some standard resistors to consider are R1 = 20 kΩ and R2 = 40 kΩ:
R2 / (R1 + R2) = 40 kΩ / (20 kΩ + 40 kΩ) = 40/60 ≈ 0.6667.
For this configuration, the output voltage will be:
Vout ≈ 6V * (40 kΩ / (20 kΩ + 40 kΩ)) ≈ 4V.
It's important to consider the input impedance of your op-amp stage so that the voltage divider output is not significantly affected. High impedance levels, typically in the MΩ range, are desirable. If necessary, use even larger resistor values for the voltage divider to achieve high input impedance while maintaining the desired ratio.
2y
How much noise is at the output if I configure the op amp for 50dB of gain
2y
To estimate the noise at the output of the op-amp configured for 50 dB of gain, you need to consider the various noise sources associated with the op-amp and the input network, such as input voltage noise, input current noise, and resistor thermal noise.
The OPA847 datasheet provides the following typical values for input voltage and current noise:
- Input voltage noise density: 1.1 nV/√Hz
- Input current noise density: 2.2 pA/√Hz
Assuming your input network consists of resistors RIN and RF, their thermal noise can also contribute to the overall noise. The thermal noise of a resistor can be calculated using:
Noise density = √(4 * k * T * R),
where k is Boltzmann's constant (1.38e-23 J/K), T is the temperature in Kelvin (assume room temperature, 298 K), and R is the resistance.
For RIN = 1 kΩ:
- Thermal noise density ≈ √(4 × 1.38e-23 × 298 × 1e3) ≈ 4.07 nV/√Hz
For RF = 316.2 kΩ:
- Thermal noise density ≈ √(4 × 1.38e-23 × 298 × 316.2e3) ≈ 22.6 nV/√Hz
The total input noise density can be estimated by adding the noise sources (op-amp and resistors) in quadrature:
Total input noise density ≈ √(1.1^2 + 4.07^2 + 22.6^2) ≈ 23.0 nV/√Hz
To get the total output noise, multiply the total input noise density by the gain:
Output noise density ≈ Gain * Total input noise density ≈ 316.2 * 23.0 nV/√Hz ≈ 7.26 µV/√Hz
To calculate the output noise over a specific bandwidth (e.g., 0 to 20 kHz), integrate the noise density over the frequency range:
Output noise (0 to 20 kHz) ≈ Output noise density * √(Bandwidth) ≈ 7.26 µV/√Hz * √(20e3) ≈ 324 µV
Keep in mind that these values are rough estimates based on typical noise densities provided in the datasheet. Actual values may vary depending on the specific device and operating conditions.
2y
8
Reviews
- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
- Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #powerjharwinbarrozo11.4M
- A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibraryjharwinbarrozo15.8k
- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlinkjharwinbarrozo1.2M
- 10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcanjharwinbarrozo1.2M
- Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlinkjharwinbarrozo1.1M
Environmental Radiation Logger Co-Pilot Example
Project Outline:
Microcontroller
RTC
Dosimeter Op Amp Stage
See DigiKey BoM for the Analog FrontEnd: www.digikey.com/en/mylists/list/476AJE8R2I
Properties
Properties describe core aspects of the project.
Pricing & Availability
Distributor | Qty 1 |
|---|---|
Digi-Key | $14.23–$14.81 |
LCSC | $16.38–$17.69 |
Mouser | $14.59 |
Controls
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markwuflux
copilot
INT/SQW pin (pin 3) of IC1 to an available GPIO pin on the microcontroller, if you plan to use the interrupt/square wave output feature.