Ideal diode model: describes the diode as an on-off device. The ideal diode can be approximated to the open-circuit and short-circuit device. In the…
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Small-signal diode models
The idea of small-signal modelling is that the short-cut part of the current-voltage characteristic of the semiconductor diode is not precise enough in an…
Signal processing diode applications
Limiter A limiter is a diode circuit that is designed to keep voltages at the load in a certain voltage range –Vmin<VL<Vmax, so the…
Diode applications: power supplies, voltage regulation
As discussed above a half-wave rectifier is not the best AC-DC converter, because it does not conduct half of the wave. The full-wave rectifier…
Transformers and their types
Transformers are most frequent nowadays in the magnetic structures that are in use in many devices. The ideal transformer is a device that sets…
Wireless network definition
This post answers the question "What is definition of wireless network?". The most important part in understanding how wireless technologies work is the fact…
WLAN radio architecture and characteristics
WLAN radio is characterised with the following characteristics: sensitivity; selectivity; dynamic range; switch states. At the same time radio transmitter has following requirements: accuracy;…
Fourier function representation
This post covers topic of fourier representation of a function. Most signals are represented with a set of exponential functions, resulting in complex exponential…
Fourier transform for continuous-time functions
This post covers the topic of fourier transform for continuous signal. Let's consider a Fourier representation of aperiodic signals. Let’s also consider an aperiodic…
Fourier transform for discrete-time periodic function
Here we consider Fourier transform for discrete-time periodic function. Let's consider the discrete-time Fourier-representation of a function fn=1N∑-∞∞anejn2πnK, where an=1N∑-∞∞F(jw)e-jn2πNk and F(jw)=∑xne-jn2πNk-∞∞. The pair of…