EP 0628227 A4 19951108 - ANALOG-TO-DIGITAL CONVERTER WITH CONVERSION RATE INVERSE TO THE INTEGRATION PERIOD.
Title (en)
ANALOG-TO-DIGITAL CONVERTER WITH CONVERSION RATE INVERSE TO THE INTEGRATION PERIOD.
Title (de)
ANALOG-DIGITALWANDLER MIT UMSETZUNGSRATE ENTGEGEN DER INTEGRATIONSPERIODE.
Title (fr)
CONVERTISSEUR ANALOGIQUE/NUMERIQUE A VITESSE DE CONVERSION INVERSE A LA PERIODE D'INTEGRATION.
Publication
Application
Priority
US 9201459 W 19920225
Abstract (en)
[origin: WO9317502A1] The present invention provides an analog-to-digital converter including an integrator (22) for charging and discharging a capacitor (24) according to two currents (IN, IP) of opposite direction containing a component of the analog input signal (VIN) which is continuously connected. Also, a control circuit (28) periodically switches on one current which remains until the integrator output reaches a reference level at which time the opposite direction current is switched on. A number of such cycles forms an integration period closely approximating a predetermined period. The control circuit measures the total amount of time of the integration period and also the accumulative amount of time that current flow is in a predetermined direction. From these two times, a digital representation of the analog input signal is calculated. The next integration period begins at the end of the previous to achieve a maximum conversion rate for a given integration period.
IPC 1-7
IPC 8 full level
CPC (source: EP)
H03M 1/52 (2013.01)
Citation (search report)
- [X] US 4584566 A 19860422 - ARCARA SAMUEL A [US]
- [X] WO 9004884 A1 19900503 - ANALOGIC CORP [US]
- [X] WO 9120132 A1 19911226 - HONEYWELL INC [US]
- [X] DE 3041954 A1 19820513 - SIEMENS AG [DE]
- See references of WO 9317502A1
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB IT LI NL SE
DOCDB simple family (publication)
WO 9317502 A1 19930902; EP 0628227 A1 19941214; EP 0628227 A4 19951108
DOCDB simple family (application)
US 9201459 W 19920225; EP 92914242 A 19920225