In this blog post input capacitance of several opamps are measured. The results are kind of surprising, but there are some useful findings that you can use when designing circuits with opamps.
In opamp circuits Input capacitance can be more than just common mode input capacitance of the opamp.
If you want to add a new parameter to your library for every component in Altium, you don't have to go over every component in your library. That could be very daunting and boring. The main that we're going to be looking at is the thing called "Parameter Manager" schematic library. In parameter manager window you … Continue reading Add Parameters to Multiple Components in Altium
Weather forecasting software or TV shows use two major temperature scales, Celsius and Fahrenheit. Why are there two? Isn't a single temperature scale enough? Well I don't know about these, but I can tell you why Fahrenheit is mostly useless and unnecessary by comparing it with its two major "competitors". Celsius is one of the … Continue reading Why Fahrenheit is garbage as a Temperature Scale
Noise is unwanted random signal, but amazingly we can calculate its RMS value or even its peak-to-peak value. In this blogpost we are going to be looking at non-inverting opamp’s output noise. We’ll see how much each component in the circuit contributes to the noise. In the end there are examples that you can look … Continue reading Non-inverting Opamp Noise Analysis
Kurodo's identity is an important method when designing filters or generally converting structures that are difficult to implement in practice to more practical ones. In this post only two of the Kurodo's identities are going to be discussed. There are two more, but we are only discuss two of them because they are the most useful ones. … Continue reading Kurodo’s identity
Richard's transform is a useful method that is used in microwave/high-frequency filter design. LC ladder tables are usually used to design prototype filter and prototype filter is converted to stub/distributed element filter by using Richard's transform. The reason for this conversion is that it's very difficult to get accurate inductors and capacitor values that is required … Continue reading Derivation of Richard’s Transform and its Application
As frequency increases the characteristics of inductors and capacitors changes. At high frequencies capacitors may start to behave like an inductor and vice versa. In this blogpost, we are going to create a SPICE model that model the frequency-dependent behavior of capacitors. The model is going to be based on impedance versus fruquency graph of … Continue reading Modeling Capacitors in SPICE (Basic, yet useful spice model)
It's often desirable to shrink the size of the circuits. Microwave circuits sometimes take a lot of space especially at relatively low frequencies. There are few methods to reduce the size of the circuit. This might inlcude changing the topology, dialectric material or topology. In this blog post, we are going to show how using … Continue reading Miniutarizing the Size of Microwave Circuits. Meander Line Trick