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1. WO1996003626 - ULTRA LOW NOISE OPTICAL RECEIVER

Publication Number WO/1996/003626
Publication Date 08.02.1996
International Application No. PCT/US1995/009327
International Filing Date 24.07.1995
IPC
G01J 1/44 2006.01
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
42using electric radiation detectors
44Electric circuits
H03F 3/08 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
04with semiconductor devices only
08controlled by light
CPC
G01C 19/721
GPHYSICS
01MEASURING; TESTING
CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
19Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
58Turn-sensitive devices without moving masses
64Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
72with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
721Details
G01J 1/44
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
42using electric radiation detectors
44Electric circuits
H03F 3/082
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
FAMPLIFIERS
3Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
04with semiconductor devices only
08controlled by light
082with FET's
Applicants
  • LITTON SYSTEMS, INC. [US/US]; 5500 Canoga Avenue Woodland Hills, CA 91367, US
Inventors
  • TAZARTES, Daniel, A.; US
  • HIGBEE, John, A.; US
  • TAZARTES, Jacque, A.; US
  • FLAMM, Juergen, K., P.; US
  • MARK, John, G.; US
Agents
  • LYNN, John, H.; Suite 1160 3200 Park Center Drive Costa Mesa, CA 92626, US
Priority Data
08/279,50925.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) ULTRA LOW NOISE OPTICAL RECEIVER
(FR) RECEPTEUR OPTIQUE A BRUIT ULTRA-FAIBLE
Abstract
(EN)
An amplifier topology for receiving signals output from a fiber optic rotation sensor and producing voltages that may be processed to determine the rotation rate includes a photodiode for receiving an optical signal and producing a corresponding electrical photodiode output signal. An ultra low noise and ultra low capacitance differential input stage is connected to receive the photodiode output signal. An operational amplifier having low noise and ultra-wide bandwidth is connected to the ultra low capacitance differential input stage to receive the output signal therefrom as a driving signal and to produce a low noise output signal. The differential input stage comprises a first amplifier circuit that includes a first transistor connected to the photodetector to act as a first buffer having low noise, low capacitance and unity gain. The first amplifier circuit also includes a second transistor configured as a first voltage follower connected between the output of the first buffer and the operational amplifier to isolate the output of the first buffer from parasitic capacitive loading from a biasing network. The differential input stage further comprises a second amplifier circuit that includes a third transistor having an input connected to a reference potential, the third transistor acting as a second buffer having low noise, low capacitance and unity gain. The second amplifier circuit also includes a fourth transistor configured as a second voltage follower connected between the output of the second buffer and the operational amplifier.
(FR)
Configuration d'amplificateur destinée à recevoir des signaux émanant d'un capteur rotatif à fibre optique pour produire des tensions pouvant être traitées pour déterminer la vitesse de rotation et comprenant une photodiode recevant un signal optique et produisant un signal de sortie électrique correspondant. Un étage d'entrée différentiel à très faible bruit et très faible capacité reçoit le signal de sortie de la photodiode. Un amplificateur opérationnel à faible bruit et grande largeur de bande est relié à l'étage d'entrée différentiel à très faible capacité pour en recevoir un signal de commande et produire un signal de sortie à très faible bruit. L'étage d'entrée différentiel comporte un premier circuit d'amplification comportant un premier transistor relié au photodétecteur servant de premier tampon à faible bruit, faible capacité et gain unitaire. Le premier circuit d'amplification comporte également un second transistor configuré comme un premier étage suiveur de tension branché entre la sortie du premier tampon et l'amplificateur opérationnel pour isoler ladite sortie des charges capacitives parasites d'un réseau de polarisation. L'étage d'entrée différentiel comporte en outre un second circuit d'amplification comportant un troisième transistor dont l'entrée est reliée à un potentiel de référence, le troisième transistor servant de deuxième tampon à faible bruit, faible capacitance et gain unitaire. Le second circuit d'amplification comporte en outre un quatrième transistor relié entre la sortie du second tampon et l'amplificateur opérationnel.
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