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1. (WO1994026029) METHOD AND APPARATUS FOR MULTIPLEXING DEVICES HAVING LONG THERMAL TIME CONSTANTS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1994/026029 International Application No.: PCT/US1994/004187
Publication Date: 10.11.1994 International Filing Date: 14.04.1994
Chapter 2 Demand Filed: 13.10.1994
IPC:
G01N 27/403 (2006.01) ,G01N 27/414 (2006.01) ,H03K 17/284 (2006.01) ,H03K 17/693 (2006.01)
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27
Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
26
by investigating electrochemical variables; by using electrolysis or electrophoresis
403
Cells and electrode assemblies
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27
Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
26
by investigating electrochemical variables; by using electrolysis or electrophoresis
403
Cells and electrode assemblies
414
Ion-sensitive or chemical field-effect transistors, i.e. ISFETS or CHEMFETS
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
K
PULSE TECHNIQUE
17
Electronic switching or gating, i.e. not by contact-making and -breaking
28
Modifications for introducing a time delay before switching
284
in field-effect transistor switches
H ELECTRICITY
03
BASIC ELECTRONIC CIRCUITRY
K
PULSE TECHNIQUE
17
Electronic switching or gating, i.e. not by contact-making and -breaking
51
characterised by the use of specified components
56
by the use, as active elements, of semiconductor devices
687
the devices being field-effect transistors
693
Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors
Applicants:
UNIFET INCORPORATED [US/US]; Suite 200 11021 Via Frontera San Diego, CA 92127, US
Inventors:
GRASSHOFF, Eric, P.; US
Agent:
GREENHAUS, Bruce, W. ; Spensley Horn Jubas & Lubitz 5th floor 1880 Century Park East Los Angeles, CA 90067, US
Priority Data:
08/053,52126.04.1993US
Title (EN) METHOD AND APPARATUS FOR MULTIPLEXING DEVICES HAVING LONG THERMAL TIME CONSTANTS
(FR) PROCEDE ET APPAREIL POUR MULTIPLEXER DES DISPOSITIFS AYANT DE LONGUES CONSTANTES DE TEMPS THERMIQUES
Abstract:
(EN) A method and apparatus for rapidly measuring chemical properties of a solution using a plurality of devices having relatively long thermal time constants selectively coupled to a control means. Current (Id) flows through only one device at a time. A timing logic control circuit controls the timing of the drain switch and, if present, the reference switch. The output of the multiplexing circuit is sampled a precise amount of time after each device begins conducting current. The temperature at the sample time is a constant. The characteristics of the solution in which the device is immersed is the only variable in the operation of the device (i.e., (Id), and (Vds) are held constant). By sampling the output a predetermined amount of time after the device has been turned on, the temperature rise is controlled. In this way, the effects of temperature rise due to conduction on the device are constant at each sample time and can be neglected, and the characteristics of the solution can be precisely determined without waiting for the temperature to stabilize.
(FR) L'invention concerne un procédé et un appareil pour mesurer rapidement les propriétés chimiques d'une solution, en utilisant une pluralité de dispositifs ayant des constantes de temps thermiques relativement longues, couplés sélectivement à un moyen de contrôle. Le courant (Id) s'écoule à travers un seul dispositif à la fois. Un circuit de contrôle logique de temporisation contrôle la temporisation du commutateur de drain et, le cas échéant, du commutateur de référence. Le signal de sortie du circuit de multiplexage est échantillonné pendant une durée précise après que chaque dispositif commence à conduire le courant. La température à l'instant d'échantillonnage est une constante. Les caractéristiques de la solution dans laquelle le dispositif est immergé est la seule variable dans le fonctionnement du dispositif (c'est-à-dire que (Id) et (Vds) sont maintenus constants). En échantillonnant le signal de sortie pendant une durée précise après que le dispositif a été mis en marche, l'augmentation de température est contrôlée. De cette manière, les effets de l'augmentation de température dus à la conduction sur le dispositif sont constants à chaque instant d'échantillonnage et peuvent être négligés. Les caractéristiques de la solution peuvent être déterminées de manière précise sans attendre que la température se stabilise.
Designated States: CA, CN, JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)