Gusberti Analog

Why impedance matching still matters for transistors

This article aims to explain why impedance matching is required for extracting the maximum gain from transistors, as is typically required in RF applications. We start by using a rough model of the transistor's input and then perform a full small-signal analysis, proving the argument in depth. Transistors

Effective Methods for Dielectric Constant Characterization in PCB Design

This article explores three methods to determine a PCB’s effective dielectric constant by analyzing resonance and reflection peaks, enabling accurate permittivity extraction for design and simulation.

A Simple 2nd Order Low-Pass Filter

Low-pass filtering is key for noise reduction, sensor averaging, and controller stabilization. This article introduces a second-order low-pass filter, adjustable via complex pole placement in the Z-plane for optimal resonance and Q factor.

Characterization of Crystal Resonators

Crystal resonators are essential for high-stability oscillators, offering low cost, precision, stability, and low-power consumption. This article explores the extraction of their electrical parameters to optimize performance in electronic design.

Loop Antenna Design

This study focuses on the design, construction, and evaluation of a 50 Ohm loop antenna for the 434 MHz band. Beginning with a full-wave round loop antenna, the design evolves into a 2:1 rectangular loop, with experiments conducted to assess prototype performance and the effects of material choices.

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