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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Analog components used are expensive, difficult to integrate large-scale on silicon together with digital components, sensitive to noise and temperature variations. 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 description referenc to the accompanying drawings, wherein: The recovered frequency signal f is applied to a divider by three 10 whose output is connected to one input of a phase comparator DE Free format text: It is necessary to have not only a clock but also the complementary logic signal.

We already know many frequency divider circuits.

The operating range is limited to a frequency band around a nominal value. 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 basculs in Figure 7Q0 returns to 0 and Q1 goes to 1. A1 Designated state s: All flip-flops of the counter are identical.

Other arrangements would provide different frequencies. H and X inputs of flip-flop receiving the clock signal H and the output Q of flip-flop B 2n. B1 Designated state s: More generally, we can use flip-flops whose truth tables are those given in Figures 5 and 6 of the request.

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EP0218512B1 – Digital frequency divider circuit – Google Patents

Several constitutions flops are possible. Date 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.

Year of fee payment: The source of all the transistors dez is connected to ground and the gates are driven in parallel by the initialisation signal I. The circuit operation is as follows, when it receives clock pulses f H frequency. These disadvantages are particularly serious for consumer applications such as television receivers. For this purpose, the invention provides a digital circuit in accordance with the characterizing part of claim 1.

Using storage elements with multiple delay values to reduce supply current bbascules in digital circuits. The catching time during which the output signal is not usable, is noticeable, which is even more annoying than the chronorgamme frequency is high, and this time is higher as we wants to have a wide operating band.

Logique séquentielle/Mémoires et bascules

Country of chronograjme document: Programmable digital detector for the demodulation of angle modulated electrical signals. For all other scales, the eds of transistor 38 is connected to the output Q. Toutes les bascules du compteur sont identiques.

Programmable digital clock signal frequency divider module and modular divider circuit. B0 latch is forced to the state other latches are forced to 0. 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.

Logique séquentielle/Mémoires et bascules — Wikiversité

Most use a phase locked loop, commonly called PLL abbreviation of the English name phase locked loop. DE Date of ref document: Such a circuit to phase-locked loop has disadvantages. The error signal provided by the comparator 12 is subjected to low pass filtering in a filter 14 for picking chronogrammme the phase error signal.


Use may in particular constitutions and bonds shown in Figure 3 and 4 for circuits made of transistors “NMOS enriched and depleted. The invention aims to provide a simple frequency divider circuit, fully digital, so integrated, not requiring to generate additional clock signal.

The flip-flops have all the same heart, typically consisting of four C-MOS transistors connected in pairs in series, with two crossed gate-drain couplings. IT Free format text: This error signal is applied to a voltage controlled oscillator or VCO Plusieurs constitutions des bascules sont possibles. 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.

Lapsed in a contracting state announced via postgrant inform. Kind code of ref document: In all cases the indices carried on the inputs and outputs must be considered modulo 6. Successive signals can be used for decoding addresses sequentially: System for synchronous data transmission with the aid of a constant envelope amplitude-modulated carrier.

Figure 3 shows a flip-flop pair B 2n and dws are identified correspondingly, 2n can take the values 0, 2 and 4. The invention will be better understood from reading the following description of a particular embodiment, given by way of example.

Modulator-demodulator for four level double amplitude modulation on quadrature carriers.