Exp_12_Schmitt_Trig_06

Exp_12_Schmitt_Trig_06 - Schmitt Trigger, Decoders Page 1...

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Schmitt Trigger, Decoders – Page 1 Schmitt Trigger Inputs, Decoders TTL Switching In this lab we study the switching of TTL devices. To do that we begin with a source that is unusual for logic circuits, an offset sine wave from an oscillator. Experiment 1: Setup the function generator as in Figure 1 to make a sine signal that is offset positively, with a maximum output not greater than 5 volts. The goal is to obtain a voltage that swings from a value near zero to a positive value that will appear as a high state to TTL input (about 2 volts) as shown in Figure 2. The diode is for protection of the TTL devices that will be connected to this source. It ensures that the input of the source does not go more negative than –0.7 volts. An ideal diode would not permit any negative voltage. If the offset source would otherwise have some negative swing then the ideal diode would lead to an output that looks like Figure 3. For a real diode the output, seen on the scope, looks like Figure 4. Function Generator V 150 Ω Sine Offset Figure 1: Sine Signal Generator Figure 2: Sine Wave with offset.
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Schmitt Trigger, Decoders – Page 2 Experiment: Vary the level of the sine signal and the offset so that you see an output like Figure 4. Then set the level and the offset so that the output resembles Fig. 2. Figure 3: Sine Wave with Offset Figure 4: Sine Wave with Diode
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Schmitt Trigger, Decoders – Page 3 Experiment 2 : Connect the offset AC source to a TTL inverter made from a NAND gate
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This note was uploaded on 07/25/2008 for the course PHY 440 taught by Professor Abolins during the Spring '06 term at Michigan State University.

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Exp_12_Schmitt_Trig_06 - Schmitt Trigger, Decoders Page 1...

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