Solid state rf oscillator-detector for flow cytometer
Номер патента: EP1153279A2
Опубликовано: 14-11-2001
Автор(ы): Frederick K. Husher, Gerard Schneider, Lazaro Ramirez
Принадлежит: Coulter International Corp
Опубликовано: 14-11-2001
Автор(ы): Frederick K. Husher, Gerard Schneider, Lazaro Ramirez
Принадлежит: Coulter International Corp
Реферат: A junction field effect transistor (JFET) RF oscillator-detector circuit generates an RF signal for an apparatus for conducting electrical measurements of particles contained in a carrier fluid passing through an aperture in a cytometer flow cell. The JFET oscillator includes a plurality of parallel-coupled JFETs having respectively different VDS vs. IDS characteristics, that are biased to operate at square law detection regions of their respective VDS vs. IDS characteristics. One JFET operates in Class C mode, while the other operates in Class AB mode. An RF resonant circuit is electrically coupled to the JFETs and to the measurement cell, and is operative to establish the frequency of an RF field applied to the measurement cell. An RF load change detection circuit is coupled to the RF resonator circuit and is operative to detect an RF load change associated with a modification of the RF field as a result of a particle within the measurement cell aperture.
Solid element RF oscillation-detector for flow cytometer
Номер патента: JP4307741B2. Автор: ケイ． ハッシャー，フレデリック,シュネイダー，ジェラルド,ラミルツ，ラザロ. Владелец: コールター インターナショナル コーポレイション. Дата публикации: 2009-08-05.