Patent ID: 8614465
Filing Date: 2013-12-24
Classification: H01L,H03K

Abstract:
1. An electronic device that generates an output signal corresponding to an input signal, comprising: a signal processing section including a transistor formed on a semiconductor substrate between an input terminal that receives the input signal and an output terminal that outputs the output signal corresponding to the input signal, wherein a gate electrode of the transistor is formed on a top surface of the semiconductor substrate; a floating electrode that accumulates a charge by being irradiated by an electron beam, wherein the floating electrode (i) is formed on the top surface of the semiconductor substrate, (ii) is formed at a distance from the gate electrode of the transistor in a direction perpendicular to a channel direction of the transistor, and (iii) run parallel to the gate electrode of the transistor; an insulating film that covers a top surface of the floating electrode; a through-hole formed in the insulating film such that the electron beam can irradiate the floating electrode through the through-hole; and a guard ring having a ring shape that surrounds the through-hole on a top surface of the insulating film, has an electrical conductivity, and is operable to trap dispersed electrons of the irradiated electron beam, wherein the signal processing section adjusts electric characteristics of the output signal according to a charge amount accumulated in the floating electrode.