How to design a simpler filter (or filter-like circuit) with a varying time constant dependent on what kind of waveform is fed to it. Discussions with some former coworkers have focused on how to design a filter or circuit with filter-like ...
Butterworth response circuits come in both low- and high-pass versions, as well as ideal, Sallen-Key, emitter follower and DC accurate variants. Many decades ago, I published a Design Idea about using equal value resistors and capacitors to ...
The frequency response of a Butterworth filter is not supposed to have any peaking. SPICE claims the contrary. I came across an online datasheet for some op-amps where I found two schematics that intrigued me. Screen-shotting them together resulted ...
Obtain tighter stop band impedance variance via the techniques detailed in this tutorial. Input impedances presented by lowpass and highpass filters in their respective stop bands are usually not controlled and can vary quite widely. Sometimes ...
The term bandwidth is used and abused in many situations. I recall one meeting where the word was used to refer to: the frequency content of a particular signal, the frequency response of a specific circuit, the speed of our local area network and ...
Applications such as audio equalizers require bandpass filters with a constant maximum gain that's independent of the filter's quality factor, Q. However, all of the well-known filter architectures Sallen-Key, multiple-feedback, ...
High school trigonometry combined with four-quadrant multipliers can be exploited to yield sinusoidal frequency doublers. Nothing non-linear is involved, which means no possibly strident filtering requirements. Starting with some sinusoidal signal ...
From the micromixer topology by Barrie Gilbert [ 1 ], this amplifier allows a single-ended input to be converted to a Class A/B current output from a single supply. As shown in Figure 1 with an LTspice implementation, the circuit employs 6 bipolar ...
Capturing transient analog signals with a microcontroller normally involves adding a full-fat peak-hold circuit as an external peripheral. This novel approach minimizes that extra hardware by using a µP’s ability to switch its pins ...
A previous article suggests that most digital output waveforms follow a nearly Gaussian profile ( Reference 1 ). Let’s test that theory. Figure 1 depicts the rising edge from a Texas Instruments DL100-44T LVDS ...