This is the one application of bootstrapping circuits where it can be used for DC. The guard is hooked up to a low-impedance point with the same potential as the input. In this mode, it's called 'guarding', and uses a small length of PCB track to encircle a high impedance point. There's even a form of bootstrap circuit used for PCB design, to prevent leakage across the board from upsetting high-impedance circuits. Unfortunately, the same term is used for all (bootstrap) and it can be difficult to know which is which unless you understand how each one works. A bootstrap system can also be used to allow an opamp to function over a wider than normal supply voltage range, effectively eliminate input protection diode capacitance, or even to make the capacitance of a cable 'disappear'. In the field of electronics, bootstrap circuits are used to increase input impedance, create 'constant current' sources (particularly audio power amplifiers), and to provide a voltage above the main supply rail (Class-D amplifiers, switchmode PSU controllers). It consists of HTML, CSS, and JS-based scripts. It (apparently) helps web developers build websites faster as they don't need to worry about basic commands and functions. It's intended to make the web development process of 'mobile-first' websites easier, by providing a collection of syntax for template designs. 'Bootstrap' also refers to an open-source web development framework. There is some mention on the Net about a 'bootstrap' system for air-conditioning systems used in aviation, but that's not relevant here. They are unique to electronic circuits, and while it may be possible to create a mechanical bootstrap 'machine', I can't think of a use for it. This is not a scientific description by any means, but it does paint an amusing mental picture.īootstrap circuits are often misunderstood, partly because they are a bit weird, and partly because there are several different types with very different functions. It's often described as the rather unlikely situation where a person lifts him/herself off the ground by pulling on his/her bootstraps (a loop at the back of boots to help pull them on). It's unclear when (or by whom) the term 'bootstrap' originated, but a web search will (as always) provide numerous answers, most of which are likely to be wrong.
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