摘要:
An integration circuit includes a differential amplifier constituted by at least two bipolar transistors (11, 12) serving as amplifying elements, a capacitor (17) connected, as a load, to the differential amplifier, and a field-effect transistor (18) having source and drain electrodes connected between the emitter electrodes of the two bipolar transistors. A control voltage is applied to the gate electrode of the field-effect transistor (18).
摘要:
In a current-mode transconductor-C integrator the non-linearity of the voltage-to-current conversion of a transconductor (17) is corrected by means of a differentiator (3) which supplies a current (i d ) which is proportional to the derivative of a current (if), which is proportional to the transconductor output current (i out ), with respect to the transconductor control voltage (v), which current (i d ) is divided by means of a current divider (9) into an input current (i in ) and is applied as a quotient current (iq) to an integrating capacitor (13) across which a voltage (v) is built up, which voltage is converted into an output current (i out ) by the transconductor. This results in an output current (i out ) which is linearly proportional to the integral of the input current (i in ) without distortion caused by the non-linear voltage-to-current characteristic of the transconductor (17).
摘要:
An integration circuit includes a differential amplifier constituted by at least two bipolar transistors (11, 12) serving as amplifying elements, a capacitor (17) connected, as a load, to the differential amplifier, and a field-effect transistor (18) having source and drain electrodes connected between the emitter electrodes of the two bipolar transistors. A control voltage is applied to the gate electrode of the field-effect transistor (18).
摘要:
A switched-current integrator circuit (50) employs track-and-hold circuits (52,54) in which the gates of the current mirror FET switches (M1,M2) are connected together to form a common gate node (58) to double the effective holding capacitance. Additionally, the common gate node (58) is coupled to the input terminal (16) through a CMOS switch (62,64) so that parasitic clock feed-through is essentially cancelled to minimize DC offset voltages (V1,V3 in FIG. 4).
摘要:
A bilinear integrator comprises a first input (1) and a second input (5). The input (1) is connected to the input of a first current memory cell formed by two transistors (T1, T2), capacitor (C1), and switch (S1). The first current memory cell is arranged to store a current applied to its input during a first portion φ of each sampling period and to reproduce that current at its output during a second portion φ of the succeeding sampling period. The second input (5) is connected to the input of a second current memory cell formed by three transistors (T3, T4 and T5), capacitor (C2) and switch (S3) via the switch (S2). During a second portion φ of each sampling period the current applied to the second input (5) and the current produced at the output of the first current memory cell are applied to the input of the second current memory cell. The second current memory cell has two outputs (from the drain electrodes of transistors (T4, T5)). The first output is fed back to the input of the first current memory cell while the second output is fed to the integrator output (8).
摘要:
@ La présente invention concerne un accumulateur analogique réalisant l'intégration de N informations analogiques sur M séquences. Cet accumulateur comporte un registre à décalage (R) à transfert de charge à entrée série et sorties parallèles à N étages, N diodes flottantes (C si à C SN ) de stockage connectées chacune à un étage du registre à décalage par l'intermédiaire d'une grille de passage, chaque diode réalisant pour les M séquences, l'accumulation et le stockage temporaire des informations analogiques de rang correspondant, N moyens de lecture (C E1 à C EN , Dn G i ) constitués chacun par une diode flottante d'entrée destinée destinée à recevoir une charge d'entraînement, une grille d'injection reliée à la diode de stockage séparant la diode d'entrée d'un drain d'evacua- tion des charges et de l'étage correspondant d'un registre (R') à entrées parallèles et sortie sortie série pour délivrer en série, à la fin des M séquences, plusieurs fois les N informations analogiques accumulées. Cet accumulateur est utilisé en association avec un analyseur à l'état solide pour acquérir et soustaire la non-uniformité du courant d'obscurité.
摘要:
La présente invention concerne un intégrateur analogique non récursif réalisant l'intégration d'un signal analogique échantillonné V n,m sur M séquences. Cet intégrateur comporte un démultiplexeur d'entrée (A) série parallèle pour envoyer successivement sur N capacités de stockage (C 1 , C 2 , ...C N ), reliées en parallèle au démultiplexeur d'entrée, M fois le signal analogique échantillonné, chaque capacité de stockage réalisant pour les M séquences la sommation sous forme de charge (∑m Q n,m ) de l'échantillon de rang correspondant du signal analogique V n,m . Il comporte, de plus, un multiplexeur (B) parallèle-série de sortie relié aux N moyens de stockage pour délivrer en sortie, à la fin de M séquences, un signal analogique Cet intégrateur s'applique notamment à la détection des raies d'un spectre récurrent en sortie d'un analyseur à onde acoustique de surface.
摘要:
An electronic integration circuit comprises an integrator input element that provides a final power stage of the electronic integration circuit and provides a constant drain current in a direct current state that controls a current of the first stage driver; and an inductive load driver constructed and arranged to drive an inductive element as a voltage follower stage. The inductive load driver processes a linear gate current to control a current output to the inductive element. A capacitor is between the first stage driver and the integrator input element. A sum of a gate-source voltage of the first stage driver and a gate-source voltage of the integrator input element is provided as an integrator input to the capacitor. The capacitor performs a linear current ramp integration operation to provide a first exponential voltage shape across the inductive element required for driving the inductive element in accordance with the controlled current output in a second exponential voltage shape.