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1. Minimize loop areas: Keep the current paths of high-frequency and high-current components, such as switches and inductors, as short and as close to each other as possible to reduce the loop area and hence, minimize the radiated fields.
2. Ground planes: Use a solid ground plane under the high-frequency components and signals. If your design involves multiple ground planes, ensure that these planes have sufficient stitching vias to maintain a low impedance path between them.
3. Decoupling capacitors: Place decoupling capacitors close to the high-frequency components to minimize EMI. The capacitors should have low ESR and ESL for better noise reduction.
4. Filtering: Use LC filters or ferrite beads for sensitive analog lines, reference voltages, and clock signals.
5. Differential signaling: Differential signaling can be used for high-speed or critical traces. It helps in rejecting common-mode noise and reduces EMI.
6. Good layout practices: Separate analog and digital grounds, use guard traces, and minimize parallel high-speed traces to avoid crosstalk. Keep the traces for different parts of the circuit separate and avoid unnecessary routing under sensitive components or traces.
7. Shielding: If needed, use shielding measures like metal enclosures or shielded cables to reduce EMI in critical sections of the board.

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1. Texas Instruments BQ25570: This is an integrated energy harvesting nanopower solution that features a low-power Buck-Boost converter with maximum power point tracking (MPPT). It also supports charging of energy storage elements, such as supercapacitors and batteries.
2. STMicroelectronics SPV1050: This is an ultra-low-power energy harvester and battery charger with embedded MPPT and power management functions mainly targeting small solar panels. It can also be used with thermoelectric generators (TEGs).
3. Analog Devices ADP5091: This IC is designed for photovoltaic and thermoelectric energy harvesting applications. It is an integrated boost and buck converters with MPPT and has a maximum power point tracking function and flexible output voltage regulation.

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1. U1 (AEM10941) - ePeas' AEM10941 Energy Harvesting IC
2. LBUCK - Inductor for the buck converter
3. LBOOST - Inductor for the boost converter

1. U1 (AEM10941) - Unfortunately, this IC is central to the design and is application-specific. Therefore, finding a direct cost-effective replacement might be challenging. But you can still check distributor websites like Digi-Key, Mouser, or Arrow for pricing or quantity price breaks. For alternative energy harvesting, ICs consider products from Texas Instruments or Analog Devices that might be more affordable.
2. LBUCK, LBOOST - Inductors can vary widely in cost depending on tolerances, Q-factor, and other factors. Look for inductors with a similar inductance value, current rating, and footprint from reputable manufacturers like Würth Elektronik, Coilcraft, or TDK. You can check pricing and availability on major distributor websites to find cost-effective alternatives. Be mindful of the trade-offs, such as size, self-resonant frequency, and efficiency, while selecting a cost-effective substitute.