Tag Archives: app notes

App note: Guidelines on the effects of parasitic capacitance on clock accuracy due to board layout

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Board design considerations like board thickness and layer stacking under a crystal when designing PCB for accurate clock crystals discuss in this app note from Maxim Integrated. Link here

Crystal oscillator is widely used in RTC applications. Clock accuracy, one of the key parameters in real-time clocks, partly depends on the parasitic capacitance of the PCB being employed. Optimizing PCB layout can achieve the desired clock accuracy.

App note: Basics of ventilator systems

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App note from Maxim Integrated about the design of modern ventilator system. Link here

This application note provides an overview of ventilator systems with a focus on system design for precision measurement and reliable protection. It discusses the four key components of a pneumatic ventilation system: gas supply, gas flow mixture, inhalation and exhalation systems. Within each of the components are a variety of sensors including pressure, flow, humidity, and temperature sensors. These sensors provide feedback to accurately control solenoid valves to ensure the air volume, pressure, and air-oxygen mixtures are delivered to the patients at specified intervals. Included in the system design are several fail-safe features and alarms to ensure reliable operation in any condition.

App note: 48V buck converter helps MHEVs meet fuel emission standards

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Maxim Integrated got you covered on designing all in 48V automotive compliant buck converter. Link here

Ever-tightening automotive fuel emission standards are becoming challenging. The gasoline engine needs the help of an electric motor to meet these standards, leading to the introduction of mild hybrid electric vehicles (MHEV) with higher battery voltages. 48V hybrids are in production today and are proliferating. A 48V buck converter with integrated MOSFETs in an advanced CMOS process helps meet these standards by withstanding high-voltage load-dump transients and operating with low EMI, low duty cycles, and high efficiency.

App note: Surge-proof your industrial sensor

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Design solution for a robust and reliable power supply for industrial sensors from Maxim Integrated. Link here

Modern industrial sensors must operate reliably in harsh and demanding industrial environments where they are prone to large surge voltages and mechanical stresses. This places considerable demands on the DC power supply that they use. We consider the merits of different approaches to designing this DC supply, before presenting the most robust, reliable and efficient solution using a uSLIC™ power module.

App note: RC Snubber for Class-D audio amplifiers

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App note from Cirrus about overshoot/ringing suppression in the output stage of Class-D amplifiers using RC Snubber. Link here (PDF)

High speed switching of power MOSFETs in the power stage of Class-D amplifiers results in output voltage over/undershoot and high frequency ringing on the output waveform. The over/undershoot places additional stress on the power MOSFETs, potentially reducing MOSFET lifetime or, in extreme cases, causing avalanche breakdown.

The high frequency ringing can couple to nearby PCB planes and cables and is therefore a source of radiated emissions. Radiated emissions can be particularly problematic in portable electronics where the Class-D amplifier may be some distance from the micro speaker and connected by a relatively long unshielded twisted pair or flex cable.

App note: Oscillator design considerations

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Interesting app note from Silicon Labs about oscillators used on their wireless SoC series 2 devices, oscillator basics included. Link here (PDF)

An oscillator is an electronic circuit which generates a repetitive, or periodic, time-varying signal. In the context of Wireless SoC Series 2 devices, this oscillator signal is used to clock execution of instructions and peripherals in the device. For radio communication the oscillator also provides an accurate and low noise frequency reference to the transciever. There are multiple ways of generating such a signal, each with different properties that influence project cost, board size, and stability of the clock signal.