In this post I will explain the Armstrong Oscillator which is yet another type of an LC oscillator circuit. What makes this so special is that it uses a parallel resonator circuit to store energy and then switches that energy between its two primary elements, the inductor (L) and the capacitor (C). The back-and-forth exchange of energy […]
Formulas
Understanding RC Oscillator Circuit, with Formulas
We all known that a single-stage transistor amplifier, when built as a common-emitter amplifier, may initiate a 180-degree phase shift between its output and input signals. This built-in characteristic of the amplifier design could be used to build an effective RC oscillator circuit. Interestingly it may be possible for us to construct transistor stages to […]
Band Stop Filter Circuit: Explained with Formulas
Another name for a band Stop Filter is the Notch Filter, which is designed to block and reject all frequencies that fall between its two cut-off frequency points, however all frequencies that are on the outer sides of this range, are allowed to pass through. A straightforward band-pass filter is created when we combine a simple […]
Understanding State Variable Filter Circuit with Formulas
In my electronic engineer profession, often times I have to use one of these state variable filters. These are actually specific types of active filters that are used in electronic circuits. These are built using one or more integrators positioned in a certain feedback arrangement. Whenever We have the requirement for an exact quality factor (Q factor) output, […]
Understanding Butterworth Filter Circuits with Formulas
We know that the Butterworth filter is a useful tool for electronics professionals but there is a trade-off with its performance. It is superior to other filter types in that it produces a completely flat response in the passband and stopband, but this ideal characteristic comes at the price of a wider transition band. This transition […]
Understanding Second Order Filter Circuits with Formulas
Second-order filters, often known as VCVS filters since their operational amplifier works like a Voltage Controlled Voltage Source amplifier, are a critical category in active filter design. These serve as fundamental elements for the construction of higher-order filter circuits, extending on previously researched active first-order RC filters. Our analysis of analog filters has included both passive […]