Author Archives: DP

App note: Understanding dual terminator resistor networks

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App note from Vishay about the dual terminator resistor network and how to check its internal resistor values. Link here (PDF)

One of the least understood resistor network schematics in the industry today is the dual-resistor terminator schematic shown in the 8-pin SIP and in the 16-pin DIP configuration.
This schematic shows up in both commercial / industrial parts and in military parts. Commercial parts are sometimes identified as TTL dual-line terminators or as pulse-squaring terminators.

App note: Phase noise measurement guide for oscillators

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App note from SiTime about phase noise, its fundamental and going to actual measurements. Link here

Phase noise is one of the fundamental metrics for oscillators. An experienced engineer can tell a lot about the quality of an oscillator and whether it fits the application by looking at the phase noise plot. RF engineers focus on the phase noise levels at certain carrier offset frequencies to make sure that the required modulation scheme can be supported. Professionals designing high speed serial links like 40GbE will apply a band pass filter to phase noise of a reference clock, integrate it, and convert it to phase jitter to predict the bit error rate of a system.

App note: Transmission-line effects influence high-speed CMOS

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Old app note from ONSEMI but still a good reference when designing with high speed CMOS devices. Link here (PDF)

Unlike low-power, metal-gate CMOS, high-speed 54HC/74HC devices readily drive long cable runs and backplanes. While the family maintains CMOS’s traditional noise immunity, you must watch transmission-line effects in such applications.

App note: Reading onsemi IGBT datasheets

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Helpful app note from ONSEMI that will guide you to their IGBT parameters. Link here (PDF)

The Insulated Gate Bipolar Transistor is a power switch well suited for high power applications such as motor control, UPS and solar inverters, and induction heating. If the application requirements are well understood, the correct IGBT can easily be selected from the electrical properties provided in the manufacturers’ datasheet.

App note: High-side smartFETs with analog current sense

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App note from ONSEMI about their high side SmartFETs and their specific application. Link here (PDF)

The “end requirement” from a high side SmartFET is to switch loads, and there are different alternatives, available in market, towards that end. Relays, for instance, have been used for long in the industry to switch various automotive loads, especially those requiring high current activation. With a continual reduction in the weight and size of automotive components and assemblies, there has been an evident transition from relays to semiconductor switches that take up less area and also offer improved noise immunity and lower electromagnetic interference as compared to relays.

App note: SEPIC converter analysis and design

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Wide input voltage is a specialty of this type of DC-DC converter, here’s an app note from ON Semiconductors on SEPIC converters. Link here (PDF)

The single−ended primary−inductor converter (SEPIC) is a type of DC/DC converter that allows the electrical potential (voltage) at its output to be greater than, less than, or equal to that at its input.
Like other DC−DC switch−mode power supply converters, the SEPIC exchanges energy between inductors and capacitors to convert from one voltage to another voltage. Typical applications for a SEPIC regulator are:
• Battery−operated equipment and handheld devices
• NiMH chargers
• LED lighting applications
• DC power supplies having a wide range of input voltages