| 释义 |
Johnson noise Electronics.
[Named after John Bertrand Johnson (b. 1887), naturalized U.S. physicist, who published an account of it in 1928.]
Electrical noise caused by the random thermal motion of conduction electrons.
1931Proc. IRE XIX. 1407 Finally..an irreducible minimum of noise is encountered, commonly referred to as ‘Johnson’ or circuit noise. 1947[see flicker noise (flicker n.3 4)]. 1958Condon & Odishaw Handbk. Physics v. iii. 31/1 This voltage fluctuation, called Johnson noise, which places a limit on the ultimate sensitivity of amplifiers, provides a method for measuring thermodynamic temperature. 1973Physics Bull. Oct. 596/2 Any electrical resistor exhibits a Johnson noise voltage, with a mean square amplitude proportional to absolute temperature. |