| 释义 |
Schmitt Electronics.|ʃmɪt|
The name of Otto Herbert Schmitt (b. 1913), American biophysicist and electronics engineer, used attrib. and absol. to designate a bistable circuit devised by him, in which the output increases to a steady maximum when the input rises above a certain threshold, and decreases almost to zero when the input voltage falls below another threshold (usu. lower than the first).
1946Jrnl. Inst. Electr. Engineers XCIII. iiiA. 306/1 Positive feedback can be used to reduce the effective grid base, or even to make it negative; an example is shown. [Note] This is the ‘Schmitt circuit’. 1953von Tersch & Swago Recurrent Electr. Transients viii. 272 If both plate-to-grid coupling and cathode coupling are utilized another trigger circuit is obtained. This circuit is called the Schmitt trigger circuit. 1962Simpson & Richards Physical Princ. Junction Transistors xvi. 418 The Schmitt trigger is neither bistable nor monostable in the ordinary sense. Its behaviour is similar to that of a non-regenerative switch but it has the advantages that it switches regeneratively at very high speed and can be designed with an accurate adjustable trigger threshold. 1967Electronic Engin. XXXIX. 752/1 A theory was required to account for the existence of a minimum ionization current below which the Schmitt fails to trigger, and a maximum above which the Schmitt fails to reset. 1975D. G. Fink Electronics Engineers' Handbk. xvi. 45 Schmitt bistables, also called Schmitt triggers, are suitable for detecting the moment when an analog signal crosses a given dc level. They are widely used in oscilloscopes to provide time-base synchronization pulses... In some Schmitt trigger circuits it is possible to modify the switching level by electrically changing the operating points of the transistors. |