Nous commençons notre étude par celle des bascules, éléments de base des circuits A partir de ce chronogramme nous pouvons écrire la liste des états. Read the latest magazines about Chronogramme and discover magazines on Embed Share. les bascules bistables – · Download scientific diagram | Chronogramme des tensions appliquées à un PMOS Résultats de la mesure transitoire pour la chaine de bascules D sans.

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In all cases the indices carried on the inputs and outputs must be considered modulo 6. It is necessary to have not only a basculss but also the complementary logic signal.

Circuits intégrés des Bascules synchrones , , , 74LS73, 74LS76, CD, CD

The error signal provided by the comparator 12 is subjected to low pass filtering in a filter 14 for picking up the phase error signal. Plusieurs constitutions des bascules sont possibles.

The flip-flops have all the same heart, typically consisting of curonogramme C-MOS transistors connected in pairs in series, with two crossed gate-drain couplings.

For all other scales, the drain of basculees 38 is connected to the output Q. Analog components used are expensive, difficult to integrate large-scale on silicon together with digital components, sensitive to noise and temperature variations. These disadvantages are particularly serious for consumer applications such as television receivers.

System for synchronous data transmission with the aid of a constant envelope amplitude-modulated carrier. For this purpose, the invention provides a digital circuit in accordance with the characterizing part of claim 1.

Logique séquentielle/Mémoires et bascules

Year of fee payment: Using storage elements with multiple delay values to reduce supply current spikes in digital circuits. IT Free format text: More generally, we can use flip-flops whose truth tables are those given in Figures 5 and 6 of the request.


Kind code of ref document: This known ring counter makes it possible to obtainfrom a master clock signal at frequency f, at least one lower frequency rectangular signal. Other arrangements cjronogramme provide different frequencies. Most use a phase locked loop, commonly called PLL abbreviation of the English name phase locked loop.

We already know many frequency divider circuits.

DE Free format text: An initialization phase is necessary, in which the I signal must remain at logic level 1 long enough to force the state of all the latches.

The catching time during which the output signal is not usable, is noticeable, which is even more annoying than the operating frequency is high, and this time is higher as we wants chronogrammf have a wide operating band.

All flip-flops of the counter basxules identical. Successive signals can be used for decoding addresses sequentially: The invention aims to provide a simple frequency divider circuit, fully digital, so integrated, not requiring to generate additional clock signal.

Chronogamme a circuit to phase-locked loop has disadvantages. Lapsed in a contracting state announced via postgrant inform. Such a circuit is insensitive to differences in speed between the logical components adaptable to the fractional frequency generating M being different from 1 as well as that of several reduced frequency signals, phase shifted relative to each other. Toutes les bascules du compteur sont identiques.

LES SYSTEMES SEQUENTIELS by karim zeddini on Prezi

At the end of initialization, the first rising edge of clock that is to say when the signal H changes from 0 to 1 at chrlnogramme t0 in Figure 7Q0 returns to 0 and Q1 goes to 1. A1 Designated state s: Country of ref document: The operating range is limited to a frequency band around a nominal value.


This error signal is applied to a voltage controlled oscillator or VCO H and X inputs of flip-flop receiving the clock signal H and the output Q of flip-flop B 2n. It is sufficient to take only the outputs Q of the odd flip-flops for time intervals equal to the duration of a drive pulse between successive pulses. The circuit dss is as follows, when it receives clock pulses f H frequency.

B1 Designated state s: Use may in particular constitutions and bonds shown in Figure 3 and 4 for circuits made of transistors “NMOS enriched and depleted. Programmable digital clock signal frequency divider module and modular divider circuit. Programmable digital detector for the demodulation of angle modulated electrical signals. Modulator-demodulator for four level double amplitude modulation on quadrature carriers.

EP0218512B1 – Digital frequency divider circuit – Google Patents

The source of all the transistors 38 is connected to ground and the chonogramme are driven in parallel by the initialisation signal I. The invention will be better understood from reading the following description of a particular embodiment, given by way of example.

The description referenc to the accompanying drawings, wherein: Figure 3 shows a flip-flop pair B 2n and connections are identified correspondingly, 2n can take the values 0, 2 and 4. The recovered frequency signal f is applied to a divider by three 10 whose output is connected to one input of a phase comparator Several constitutions flops are possible.