O circuito lógico TTL é um dispositivo TTL que possui quatro portas lógicas AND de duas entradas cada porta. Ele é usado, principalmente, em circuitos. jpg ( × pixels, file size: 15 KB, MIME type: image/jpeg). Open in Media English: chip Date, 14 Circuito integrado Utilice dos CI y un CI Contador decimal Esto se hace iniciando el circuito con cada uno de los seis estados no utilizados mediante las entradas de .

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Circuito integrado – EcuRed

Y is identical to that of the TTL clock. Experimental Determination of Logic States.

Y is identical to that of the output terminal U2A: Information necessary to the model include: Threshold Voltage VT Fig 3. Full-Wave Rectification Bridge Configuration a.

Circuito integrado 7408

Events repeat themselves after this. The model construct by simulation aim at checking the adequacy of the ventilation circuit to the NR22 Brazilian regulation.

BJT Current Source a. For reverse-bias potentials in excess of 10 V the capacitance levels off at about 1. For more complex waveforms, the nod goes to the oscilloscope. Darlington Input and Output Impedance a. Experimental Determination of Logic States a. The logic states of the output terminals were equal to the number of the TTL pulses. The network is a lag network, i. The larger the magnitude of the ckrcuito gate-to-source voltage, the larger the available channel.


VT Vdc 2V The Q point shifts toward saturation along the circkito. Replace R1 with 20 Kohm resistor.

Build and Test CE Circuit b. Improved Series Regulator a.

For JFETs, increasing magnitudes of input voltage result in lower levels of output current. Hence, we observe a 41 percent difference between the theoretical input impedance and the input impedance calculated from measured values. Clampers R, C, Diode Combination b.


As noted above, the results are essentially the same. B are the inputs to the gate, U1A: The amplitude of the output voltage at the Q terminal is 3. The experimental data is identical to that obtained from the simulation. Thus, the values of the biasing resistors for the same bias design but employing different JFETs may differ considerably.

Beta would be a constant anywhere along that line. This is expected since the resistor R2, while decreasing the current gain of the circuit, cirvuito the circuit in regard to any current changes.

The drain characteristics of a JFET transistor are a plot of the output current versus input voltage. The oscilloscope only gives peak-peak values, which, if one wants to obtain the power in an ac circuit, must be converted to rms. In total the voltage-divider configuration is considerably more stable than the fixed-bias configuration. Q terminal is one-half that of the U1A: Forward-bias Diode characteristics b. The voltage-divider bias configuration was the least sensitive to variations in Beta.


IF as shown in Fig. B are at opposite logic levels. Z1 forward-biased at 0. The heavy doping greatly reduces the width of the depletion region resulting in lower levels of Zener voltage. The enhancement MOSFET does not have a channel established by the doping sequence but relies on the gate-to-source voltage to create a channel. The greatest rate of increase in power will occur at low illumination levels. Zener Diode Regulation a.

Possible short-circuit from D-S.

For the BJT transistor increasing levels of input current result in increasing levels of output current. This represents a 1. Positive pulse of vi:

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