Showing papers on "Decoupling (electronics) published in 1981"

Disturbance Decoupling by Measurement Feedback with Stability or Pole Placement

Abstract: In this paper we solve the disturbance decoupling problem by measurement feedback and requiring stability or pole placement on the closed loop system. The problem is attacked using the geometric approach through the concepts of $A(\bmod \mathcal{B})$-invariant and controllability subspaces and their duals, $ A \mid K$-invariant and complementary observability subspaces. The solution of this problem has an interesting structure consisting of a feedback processor which decomposes into (i) a disturbance decoupling loop; (ii) a disturbance input stabilization or pole placement loop, and (iii) a controlled output stabilization or pole placement loop.

Semiconductor integrated circuit device including means for reducing the amount of potential variation on a reference voltage line

Abstract: In an MOS memory, a reference voltage is generated to determine an input threshold voltage of the input circuit. Noise fed from various signal wirings to the reference voltage wiring via stray capacitances is reduced by a decoupling capacitance formed between the reference voltage wiring and the ground wiring. The decoupling capacitance, however, permits relatively large levels of noise induced on the ground wiring by changes in the operation current of the circuit to be transmitted to the reference voltage wiring. According to this invention, a capacitance which forms a pair with the decoupling capacitance is provided between the power-supply wiring and the reference voltage wiring. Noise induced on the power-supply wiring by a change in the operation current of the circuit is substantially opposite in polarity to the noise induced on the ground wiring. Therefore, the noise fed from the ground wiring to the reference voltage wiring is cancelled by the capacitance provided between the power-supply wiring and the reference voltage wiring.

Magnetism of Fe, Co and ni in the CPA and full static approximation

Abstract: Magnetic properties of Fe, Co and Ni are studied with use of the CPA and full static approximation (FSA) in the two-field functional integral method. It is verified that the results qualitatively agree with those obtained by Hasegawa with use of the decoupling approximation in the CPA equation. Calculated Curie temperatures are 950 K for αFe, 1860 K for Co and 850 K for Ni. It is found that the spin susceptibility of Ni considerably deviates from the Curie-Weiss law in the CPA-FSA.

Trigger device and piezo-ignition coupler with galvanic decoupling

Abstract: A trigger device for electronic switches operating according to piezo-electric principles and having galvanic decoupling between the input control electronics and the controlled electronics switch has a piezo-ignition coupler which is a lamina of piezo-ceramic material having at least two spaced electrodes on one surface thereof and at least two counter electrodes in registry therewith on an opposite side thereof. The respective electrodes in registry form electrode pairs and one pair of electrodes is connected to the control electronics and another pair of electrodes is connected to the trigger electrode of the electronic switch. The lamina has a shape displaying an axis with more than two-fold rotational symmetry and the dimensions of the lamina are selected such that the frequency of an alternating signal supplied to the lamina is matched to the resonant frequency of the lamina at a value between 20 kHz and 500 kHz for inducing a mode of vibration according to the principle of radial oscillation.

Machine and method for balancing wheels

Abstract: A machine and method for balancing wheels is disclosed whereby the wheel is affixed to and spun on a rotatable shaft to an initial velocity, the drive unit is decoupled and the forces of unbalance are measured during the first full revolution of the shaft after it reaches a predetermined measuring velocity. The initial velocity is selected as the lowest of a plurality of velocities which will yield a time from decoupling to measuring of unbalance of at least 2 seconds. Automatically activated drive and brake mechanisms are also disclosed as is a system of unbalance sensor arrangement having two movable sensors linked to one another at a fixed distance.

Apparatus and method for coupling and decoupling of optical fiber waveguides

Abstract: An apparatus and method for coupling and decoupling of optical radiation, in particular for laser light in optical fiber waveguides. The optical fiber waveguides are positioned in V-grooves and brought to a beam splitter. The beam splitter is adjusted by independent carriage guides and rotary guides, in order to separate a part of the radiation, which is representatively predetermined and required for control purposes.

Zur Lageregelung von Industrierobotern bei Entkopplung durch das inverse System / On position control of industrial robots with decoupling by the inverse system

Abstract: Durch Kompensation mit dem inversen System und mit einer hier angegebenen Reglerstruktur mit noch frei wählbarer Regeldynamik läßt sich ideales Führungsverhalten erzeugen. Für die Anwendung dieses Prinzips zur Lageregelung eines Industrieroboters (IR) wird eine nichtlineare Regeldynamik gewählt. Diese läßt den IR sich einer beschleunigten Führungslage überschwingfrei annähern (Greifen) und ihn einer solchen besser folgen ( Bahnfahren ) als die übliche Kaskadenregelung. Das Regelprinzip wurde an einem IR realisiert und die genannten Eigenschaften bestätigen sich beim Greifen von Werkstücken, die durch ein Förderband bewegt werden.

Low‐frequency surface interference effects in long‐range sound propagation

Abstract: Characteristics of surface decoupling loss are discussed for acoustic frequencies below 250 Hz. It is shown that large losses will occur at frequencies below 100 Hz and for source or receiver depths less than 25 m. A significant dependence of decoupling loss on the average angle of surface‐incident energy is indicated. It is this property which gives rise to two major effects in long‐range propagation. Firstly, experimental data are presented from a selection of bottom‐limited enviroments, which show a range dependence in decoupling loss for 18‐m source depths. At 25 Hz these losses correspond to a loss coefficient of 0.013 dB/km and at 50 Hz to 0.008 dB/km. At these frequencies this is greater than the water column attenuation coefficient. The effect is caused by successive bottom interactions reducing the average angle of incidence at the surface consequently increasing surface decoupling loss. A second effect described is also due to bottom interactions. In this case, encounters with an upward‐sloping bottom increase the average angle and reduce the decoupling loss. An apparent level enhancement results. Both experimental data and models are used to describe and interpret these effects.

Decoupling and disturbance rejection control of linear time-varying time-delay systems

Abstract: The use of a new time-delay operator is proposed for the purpose of investigating the decoupling and disturbance rejection control of linear time-varying systems with time delays in state and control variables (LTVSTD). The algebraic properties of the time-delay operator and its matrix are studied in detail to obtain a useful sufficient condition of decoupling and disturbance rejection control for the most general class of LTVSTD with arbitrary initial functions in state and control variables.

Decoupling device for nuclear magnetic resonating device

Abstract: PURPOSE:To make sufficient decoupling possible, by employing a phase lock looped circuit fo a decoupling device and also by making variable control of frequency division ratio of feedback frequency divider for this phase locked loop within a prescribed range. CONSTITUTION:Phases of an output of a frequency source 1 and an output of a programmable counter (PC) 7 are compared by a detector 2. This output is inputted to a charge pump 3, and a DC voltage is obtained in proportion to the phase difference. An output frequency of a voltage control oscillator (VCO) is varied in accordance with the DC voltage, and after having been amplified by an amplifier 5, it is applied from a radiation coil 6 to a specimen to be decoupled. At first, when the frequency ratio in N0 and the feedback loop is in a stable condition, a high frequency to be irradiated from an irradiating coil is fr.N0. And when the frequency ratio of PC 7 became N1 and the system is stabilized, the high frequency becomes f1.N1.

On output feedback decoupling

Abstract: A new necessary and sufficient condition is derived to decouple linear time-independent multivariable systems through output feedback. As a consequence of this result, an easily computable sufficient condition for output feedback decoupling is obtained which is expressed in terms of the open-loop parameters of the system. This condition is a considerable improvement over the one recently derived by Sinha in [7].

Skidding vehicle speed detector - has circuit producing error signal to denote open circuit fault condition

Abstract: A detector circuit is connected to antiskid and antislip equipments in order to transmit their speed. The detector output provides a signal representing the rotational condition of the wheels and the detector is able to signal faults within the detector or cabling. A detector comprises two field plates resistances (1,2) operating in conjunction with toothed wheels and connected in series in the emitter circuit of a transistor (4) whose base has a constant potential applied to it so that the signal is independent of power supply variations. The detector output (9) is applied to an amplifier (11) which is activated via a resistor (18) and decoupling diode (16) in the event of an open circuit in the field plate circuit. This effect produces an error signal for a difference amplifier (27) whose output drives a lamp (49) indicator via a decoupling diode (46).

Power supply for diagnostic probe - has AC connection from DC supply via fixed bias coupling

Abstract: The power supply for a diagnostic probe has an AC connection from the control box to the probe and with an AC/DC converter in the probe to generate the DC monitoring signals. The connection is via a fixed bias line. The system allows a controlled power supply with suitable decoupling to prevent injury to the patient and without any losses, as with DC transmission. The AC/DC converter operates identical to one in the power supply, while the signal is transmitted by a frequency controlled signal on the AC supply.

Free wheeling three=phase inverter with variable supply - has antiparallel network of thyristor and diode isolating inverter from source

Abstract: A free-running three-phase inverter is supplied from a d.c. voltage source with a variable voltage and a parallel-connected reservoir capacitor. Each phase contains two thyristors and two free-running diodes in a bridge network. Each shunt arm of the bridge contains a commutator choke with a centre tap connected to the load. There is an anti-parallel network of a decoupling thyristor (16) with a diode (15) between one terminal of the reservoir capacitor (17) and the inverter. The anode of the thyristor is connected to the inverter. The decoupling thyristor is controlled by ignition signals at specific instances.

Probe circuit of fourier transform type nuclear magnetic resonator

Abstract: PURPOSE:To accurately correct the variation of magnetic field, by adding the circuit capable of turning at H frequency or less to the coil of H decoupling irradiation side to make possible the irradiation detection of D signal and also making possible a locking mechanism obtained by the atomic nuclear resonance of solvent sample. CONSTITUTION:D nuclear irradiation signal is taken out from the connecting point 60 of the capacitors 56, 58. The connecting point 41 of the capacitors 38, 40 is the input terminal of hydrogen nucleus decoupling. Winding number of the coil 36 can be turned at 90MHz and the coil 62 is connected in series and then said coil 36 can be accurately turned at 13.8MHz by varying the capacitor 56. In order to prevent the leakage of 90MHz H decoupling frequency to the terminal 60, an antiresonance is given at 90MHz by the coil 62 and capacitor 64 to set high impedance of this circuit. Hereby, a long-term integration is performed with a high accuracy by the inner locking of heavy hydrogen nucleus.

Compensator Design for Decoupling of Multivariable Systems

Abstract: The problem is studied in this paper of designing a decoupling system, by a state feedback control law with or without dynamic compensator. It is shown that the precompensator presented by Silverman is of a minimum dimension, and a simple method for obtaining the order of the precompensator is presented. The extension of the concept to the multivariable system with r-output/m-input leads to an algorithm of designing a lower order precompensator for decoupling. It is easily shown that if a constraint is incorporated in the control law in such a way that the resulting decoupling problem is linear, then the algorithm presented here gives the precompensator of a minimum dimension.

Fault detector for vehicle indicates failure of one or more lights - using single transistor coupled via decoupling diodes to each light

Abstract: The fault detector has each connection point between a light and its associated resistor connected via a decoupling diode (18A,18B) to a transistor. The transistor turns on when a light fails and turns on a semiconductor switch. The base potential of the transistor is set by a biasing diode (23,24). The characteristics of the biasing diode are chosen according to the base-emitter junction of the transistor and the decoupling diode. Any number of lights can be monitored using only the one transistor even when the supply voltage and temp. change.(DS).

Investigations of Hydrogenated Amorphous Silicon by High Resolution NMR of 29Si

Abstract: The new techniques of high resolution NMR in solids on “rare” spins via cross polarization and proton spin decoupling introduced by A. Pines, M.G. Gibby and J. Waugh, combined with the rapid rotation of the sample at the magic angle have been applied to amorphous hydrogenated silicon. These experiments can give structural informations on these materials and on their amorphous nature. First results will be presented.

13C{1H} single frequency off-resonance decoupling of secondary carbons

Abstract: 13C{1H} single frequency off-resonance decoupled spectra of secondary carbons with two chemically non-equivalent protons are analysed theoretically and experimentally. By a careful analysis of the frequencies of all six transitions all spectral parameters, including the geminal proton-proton coupling constant, can be determined very accurately.

Spin resonance spectra detonator system - uses decoupling signal pulse groups in async. relation to signal scanning

Abstract: The spins of one nuclear type of a specimen, located in a magnetic field, are energised by pulsed h.f. signals. The relaxation oscillations of the spin are repeatedly scanned in preset time intervals and recorded. A h.f. decoupling signal is applied to the specimen, in order to reduce a coupling with spins of other nuclear types. The signal consists of a periodical train of pulse groups, each containing at least one pulse. The pulses of a group are rated to provide together a rotation of the spin movements by n x 360 deg., n being an integral number or zero. The pulses are so short that their frequency spectrum, based on Fourier analysis, covers, the entire resonance region of the other nuclear type. The pulse groups of the decoupling signals are asynchronous in relation to the signal scanning.