Frederick K. Husher - Pembroke Pines FL Gerard Schneider - Irvington NY Lazaro Ramirez - Miramar FL
Assignee:
Coulter International Corp. - Miami FL
International Classification:
G01N 2700
US Classification:
324 711, 324 714, 324610, 324316
Abstract:
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 V vs. I characteristics, that are biased to operate at square law detection regions of their respective V vs. I 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 State Rf Oscillator-Detector For Flow Cytometer
Frederick K. Husher - Pembroke Pines FL Gerard Schneider - Irvington NY Lazaro Ramirez - Miramar FL
Assignee:
Coulter International Corp. - Miami FL
International Classification:
G01N 2700 G01V 300 G01R 2702
US Classification:
324 711
Abstract:
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 V. sub. DS vs. I. sub. DS characteristics, that are biased to operate at square law detection regions of their respective V. sub. DS vs. I. sub. DS 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.
Name / Title
Company / Classification
Phones & Addresses
Lazaro Ramirez Principal
Shalom Car Wash Carwash · Nonclassifiable Establishments
2501 Riverside Dr, Pompano Beach, FL 33065
Lazaro Ramirez Principal
Lazaro A Ramirez Business Services at Non-Commercial Site
9950 SW 156 Ter, Miami, FL 33157
Lazaro Ramirez Manager
Jaly Transport LLC
11553 SW 26 Pl, Hollywood, FL 33025
Lazaro A Ramirez
A2P AUTO DETAIL INC General Auto Repair · General Automotive Repair Shops, Nsk
9950 SW 156 Ter, Miami, FL 33157 3020 NE 32 Ave, Fort Lauderdale, FL 33308