Thomson-csf

Jean L Coutures

Jean L Berger

Roger Benoit-Gonin

Pierrick Descure

Jacques Chautemps

Guy Moiroud

Pierre Descure

A multilinear charge transfer array is provided formed by N lines of P photosensitie detectors. Each photosensitive detector is connected directly by a connection to a demultiplexing and reading system, the signals obtained at the output of the array being fed to a processing device external to the array. The demultiplexing system comprises a charge transfer shift register with N.times.P stages, the connections between each detector and the corresponding input of the register being provided so that the detectors of the same rank are connected to contiguous inputs.

Multilinear charge transfer array

A non recursive analog integrator providing M integrations of a sampled analog signal Vn,m. The integrator comprises a series parallel demultiplexer with N outputs, N capacitors each with an electrode connected to a floating potential with respect to a reference potential, and a parallel series multiplexer with N inputs, the respective capacitors being connected in parallel between the outputs of the demultiplexer and the inputs of the multiplexer. Each capacitor performs, at each integration, the summation in form of charges of the sample of corresponding rank of the sampled analog signal Vn,m. So, at the end of the M integrations, an analog signal- ##EQU1## is obtained at the output of the multiplexer. Charge transfer devices serve as the series parallel demultiplexer and as the parallel series multiplexer.

Non-recursive analog integrator

A process of detecting bar codes constituted by bars having a height H and a width D and presenting flaws of a height A, which comprises the steps of summing the signals issuing from detectors of identical rank which belong to at least two rows of N detectors having a spacing pitch smaller than or equal to D/2, said rows being perpendicular to said codes so that at least one of the distances between said rows is greater than A, and comparing the sum signal thus obtained to a decision threshold to obtain a 'code present' or 'code absent' signal while eliminating any flaws possibly present in said codes.

Process and device for detecting bar codes

The device comprises a capacitor, first means for taking into account, in logic form, the potential of the capacitor, second means which, in a first time, fixes the potential of the capacitor to a given value, third means which, in a second time, modify or do not modify the potential of the capacitor, depending on whether or not the charge quantity to be detected is present or absent, and fourth means which, in a third time, reloop the output of the first means to the input of the first means, the output of the first means constituting the output of the detection and storage device. Application to digitally programmable filters.

Device for detecting the presence or absence of a charge quantity and

In a device for current-reading of a quantity of electric charges, the control circuit for the first and second MOS transistors receives a constant potential and comprises:

Device for current-reading of a quantity of electric charges and a

This analog-ditigal coder determines the coefficients a.sub.o . . . a.sub.n in two stages:

Analog-digital coder comprising a charge transfer coded voltage

A switched capacity filter having capacities formed by MOS technology on a semiconductor substrate. The connection between two capacities whose first plates are formed by the semiconductor substrate are periodically connected by providing transfer of charges in the substrate on which these two capacities are integrated. The external or other plate of each capacity receives, the input voltage, or a reference voltage, or the surface potential under another capacity which is provided by a reinjection and reading device formed from a diode and a voltage follower stage.

Charge-transfer switched-capacity filter

Successive two-trip traversals of charges between gates G.sub.0 and G.sub.2 make it possible to obtain beneath gates G.sub.1 and G.sub.2 quantities of charges equal to Q.sub.R, Q.sub.R /2, Q.sub.R /2.sup.2 . . . Q.sub.R /2.sup.i. A readout device for reading charges and connected to gates G.sub.2 and G.sub.4 generates voltages V.sub.R and V.sub.Ri =a.sub.0 .multidot.V.sub.R +a.sub.1 .multidot.V.sub.R /2+ . . . +a.sub.i-1 .multidot.V.sub.R /2.sup.i-1 +V.sub.R /2.sup.i which are compared with a voltage sample V.sub.x to be coded in order to determine by successive approximations the coefficients a.sub.0 . . . a.sub.n which are equal to 0 or to 1 such that V.sub.x =a.sub.0 .multidot.V.sub.R +a.sub.1 .multidot.V.sub.R /2+ . . . +a.sub.n .multidot.V.sub.R /2.sup.n. Depending on the value of a.sub.i, each quantity of charges Q.sub.R /2.sup.i stored beneath gate G.sub.1 is removed beneath diode D.sub.e or stored beneath gate G.sub.3 and then transferred beneath gate G.sub.4.

Charge-transfer coded-voltage generator for use in analog-digital coders

The input voltage (V.sub.e) of the device is constituted by the superposition of a direct voltage (V.sub.0) and a time-varying sampled voltage (v.sub.e). Subtraction means comprising storage and transfer electrodes, and diodes, establish the difference between the quantity of charges which is double the quantity corresponding to the direct voltage (that is, 2Q.sub.moy) and the quantity of charges corresponding to each sample of the variable voltage superposed on the direct voltage (that is, Q.sub.moy .+-.q.sub.e).

Charge-transfer phase-inverter device and differential amplifier

The storage electrodes are electrically connected at a point. A reference charge quantity is stored beneath the first storage electrode when the point is at a constant potential and before charges pass beneath the second storage electrode. When a charge quantity arrives beneath the second storage electrode and when the point is floating, the surface potential beneath the first storage electrode is maintained constant and a charge quantity is transferred from the first storage electrode to a third storage electrode.

Substraction and charge quantity generation charge transfer device

The invention relates to a device for reading a quantity of electric charges then injecting in a charge-transfer device a quantity of charges which depends on the quantity previously read. This device comprises a reading grid connected to the source of an MOS charge-injection transistor operating in saturation and formed from two diodes and a control grid.

Electric charge injection and reading device and application of such a

The process more particularly comprises introducing beneath the final storage capacitor C.sub.6 a quantity of charges equal to that located there during the processing of the preceding sample of the input signal, prior to the beginning of charge transfer from said capacitors to the means which convert the charges into a voltage, and distributing the charges between said capacitor and the preceding capacitor as a function of the capacitance values. The switched capacitor filter more particularly comprises, when it is looped, a circuit R permitting the application to the looping capacitor C.sub.4 of a voltage V.sub.g +.DELTA.V.sub.s, while the foils of the other storage capacitors of the filter are connected to the voltage V.sub.g.

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Paris, France

Jean L Coutures