Opamp Input Capacitance Part 2: Results

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.

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Why Fahrenheit is garbage as a Temperature Scale

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

Derivation of Richard’s Transform and its Application

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

Modeling Capacitors in SPICE (Basic, yet useful spice model)

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)

Miniutarizing the Size of Microwave Circuits. Meander Line Trick

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