☑ Diode Logic Circuits Examples

The most common use for diode logic is in diodetransistor logic dtl integrated circuits that in addition to diodes include. In graphical method the load line is drawn on the v i curve of the diode.

Cp 208 Digital Electronics Class Lecture 4 February 18 Ppt

Diode Logic Gates

Ttl Transistor Transistor Logic Families History And

A diode logic circuits produces an output voltage which is either high or low depending upon the levels of several input voltages.

Diode logic circuits examples. Diode logic dl or diode resistor logic drl is the construction of boolean logic gates from diodesdiode logic was used extensively in the construction of early computers where semiconductor diodes could replace bulky and costly active vacuum tube elements. Implementation of nand gate. Diode logic uses the fact that diodes conduct only in one direction.

For example the half wave rectifier is a clipper circuit since all voltages below zero are eliminated. If we need a and gate we can use a 4081 and cmos ic or a ttl 7408 and ic but sometimes it is easier to use diodes. The nand gate may be easily implemented by putting a transistor logic not gate immediately at the output of a diode and gate.

For this example v 5 volts although other voltages can just as easily be used. Now if both inputs are unconnected or if they are both at logic 1 output z will be at logic 1. They behave like switches.

1611 example 5 parallel connection of diode with different voltages graphical method. The circuit has a single output terminal at the diode anodes and three input terminals at the device cathodes. If we need a or gate we can use a 4071 or cmos ic or a ttl 7432 or ic.

Some logic gates can be produced with just diodes and resistors called diode resistor logic or drl. If either input is grounded logic 0 that diode will conduct and will pull the output down to logic 0 as well. And gate or gate signal decays with each stage not regenerative output voltage is high only if both a and b are high output voltage is high if either or both a and b are high.

Or and and logic gates made with diodes. The two basic logic circuits are the and gate and the or gate. Figure 3 49 shows the circuit diagram of a diode and gate.

Thus the circuit of figure may be rearranged placing not gate immediately after the and gate to yield the nand gate of figure 2. It is seen that the diode anodes are connected to a 5 v supply v cc via resistor r 1. Diode clipping circuits this clipping of the input signal produces an output waveform that resembles a flattened version of the input.