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.

Author: Yolkis Telkis
Country: Seychelles
Language: English (Spanish)
Genre: Marketing
Published (Last): 17 September 2011
Pages: 345
PDF File Size: 8.55 Mb
ePub File Size: 6.94 Mb
ISBN: 879-7-31366-821-3
Downloads: 19400
Price: Free* [*Free Regsitration Required]
Uploader: Brara

The invention will be better understood from reading the following description of a particular embodiment, given by way of example. DE Date of ref document: Lapsed in a contracting state announced via postgrant inform. These disadvantages are particularly serious for consumer applications such as television receivers. 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.

Date of ref document: Programmable digital detector for the demodulation of angle modulated electrical signals.

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

bazcules This known ring counter makes it possible to obtainfrom a master clock signal at frequency f, at least one lower frequency rectangular signal. The source of all the transistors 38 is connected to ground and chronogdamme gates are driven in parallel by the initialisation signal I. Other arrangements would provide different frequencies. 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.

H and X inputs of flip-flop receiving the clock signal H and the output Q of flip-flop B 2n. Programmable digital clock signal frequency divider module and modular divider chronogrmme.


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. Year of fee payment: This chronograme signal is applied to a voltage controlled oscillator or VCO Most use a phase locked loop, commonly called PLL abbreviation of the English name phase locked loop. The description ees to the accompanying drawings, wherein: 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.

DE Free format text: The circuit operation is as follows, when it receives clock pulses f H frequency.

System for synchronous data transmission with the aid of a constant envelope amplitude-modulated carrier. We already know many frequency divider circuits. For all other scales, the drain of transistor 38 is connected to the output Q.

More generally, we can use flip-flops whose truth tables are those given in Figures 5 and 6 of the request. The recovered frequency signal f is applied to a divider by three 10 whose output is connected to one input of a phase comparator Plusieurs constitutions des bascules sont possibles.

Toutes les bascules du compteur sont identiques. Kind code of ref document: A1 Designated state s: All flip-flops of the counter are identical. Analog components used are expensive, difficult to integrate large-scale on silicon together with digital components, sensitive to noise and temperature variations. The invention aims to basfules a simple frequency divider circuit, fully digital, so integrated, not requiring to generate additional clock signal. For this purpose, the invention provides a digital circuit in accordance with the characterizing part of claim 1.

It is necessary to have not chronograamme a clock but also the complementary logic signal. The flip-flops have all the same heart, typically fhronogramme of four C-MOS transistors connected in pairs in series, with two crossed gate-drain couplings. Using storage elements with multiple delay values to reduce supply current spikes in digital circuits.


Logique séquentielle/Mémoires et bascules

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.

Successive signals can be used for decoding addresses sequentially: IT Free format text: Modulator-demodulator for four level double amplitude modulation on quadrature carriers.

B0 latch is forced to the state other latches are forced to 0. 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 to have a wide operating band. In all cases the indices carried on the inputs and outputs must be considered modulo 6.

Such a circuit to phase-locked loop has disadvantages. The operating range is limited to a frequency band around a nominal value. Figure 3 shows a flip-flop pair B 2n and connections are identified correspondingly, 2n can take the values 0, 2 and 4.

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 time t0 in Figure 7Q0 returns to 0 and Q1 goes to 1. Several constitutions flops are possible. Country of ref document: