What is a positive AND gate?
Positive Logic OR gate. The Positive Logic OR gates output achieves its ACTIVE state, (HIGH), when “one or more of its inputs” achieve their ACTIVE state, (HIGH). Negative Logic OR gate. The Negative Logic OR gates output achieves its ACTIVE state, (LOW), when “all of its inputs” achieve their ACTIVE state, (LOW).
What is diode and or and AND gates?
The OR logic gate is implemented in the diode logic by connecting the diodes parallel. The diodes are normally open switches. It is clear from the circuit that the input is applied to the anode of the diode and the output is taken at the cathode of the diode across the resistor R1 to the ground.
What is diode gate?
Diode logic gates. In logic gates, logical functions are performed by parallel or series connected switches (such as relay contacts or insulated gate FETs like CMOS) controlled by logical inputs or parallel resistors or diodes which are passive components.
Why diodes are used in AND gate?
Diode logic gates use diodes to perform OR and AND logic functions as shown in the circuit diagram. Connection of the LED at the output is optional which simply displays the logical state of the output, i.e. the logic state of output is 0 or 1, if LED is off or on, respectively.
What is a negative AND gate?
The Negative-AND Gate A Negative-AND gate functions the same as an AND gate with all its inputs inverted (connected through NOT gates). In keeping with standard gate symbol convention, these inverted inputs are signified by bubbles.
What is positive and negative logic gates?
Positive logic is defined as a high voltage level representing a logic 1 and a low voltage level representing a logic 0. Negative logic is the reverse, i.e., a low voltage level represents a logic 1 and a high voltage level represents a logic 0.
What is the RTL DTL and TTL?
Transistor–transistor logic (TTL) is a logic family built from bipolar junction transistors. Its name signifies that transistors perform both the logic function (the first “transistor”) and the amplifying function (the second “transistor”), as opposed to resistor–transistor logic (RTL) or diode–transistor logic (DTL).
Can we make AND gate using diode?
There are two inputs and one output in an AND Gate. When both the inputs of the AND gate is HIGH, the output is HIGH. Whereas the output is LOW or Zero in all the other cases. The AND gate using diodes follow the same working principle.
How does or gate work?
An OR gate is a digital logic gate with two or more inputs and one output that performs logical disjunction. The output of an OR gate is true when one or more of its inputs are true. If all of an OR gate’s inputs are false, then the output of the OR gate is false.
How is an AND gate made?
A simple 2-input logic AND gate can be constructed using RTL Resistor-transistor switches connected together as shown below with the inputs connected directly to the transistor bases. Both transistors must be saturated “ON” for an output at Q.
What is negative or gate?
Negative Logic Gates It amounts to changing AND’s to OR’s or vice versa and inverting all input and output lines compared to the implementation in gates shown at left. Basic Gates.
How does a AND gate work?
The AND gate is a basic digital logic gate that implements logical conjunction (∧) from mathematical logic – AND gate behaves according to the truth table above. A HIGH output (1) results only if all the inputs to the AND gate are HIGH (1). If not all inputs to the AND gate are HIGH, LOW output results.
What is negative AND gate?
What is positive logic NAND gate?
(Hint) To change a positive-logic gate to a negative-logic gate is to complement all inputs and output of the gate at the same time. A positive-logic NAND gate implements the function (xy)’. Hence a negative-logic NAND gate implements ((x’y’)’)’ = (x+y)’, which is NOR function.
Which is better DTL or TTL?
DTL offers better noise margins and greater fan-outs than RTL, but suffers from low speed, especially in comparison to TTL. RTL allows the construction of NOR gates easily, but NAND gates are relatively more difficult to get from RTL.
What is the positive logic?
Why does an AND gate need a resistor?
This ensures the functionality as an AND gate. If both input voltages are high, no or only little current will flow, thus only a small voltage will drop keeping the output voltage high. If one of the too inputs has low voltage, the output oltage will drop.
What is an OR gate used for?
The function of an OR gate is to find the maximum between the inputs which are binary in nature. It is one of the basic gates used in Boolean algebra and electronic circuits like transistor-transistor logic, and complementary metal-oxide semiconductors make use of it.
What is diode AND AND gate?
Diode AND Gate for Positive and Negative Logic | AND gate. The AND gate, also called COINCIDENCE gate, has two or more inputs and a single input and its output assumes the 1 state if and only if all the inputs assume the 1 state.
What is the logic of a diode?
Diode Logic OR gate (wired OR connection) If one or both inputs are at logic “1” (5 volts), the current will flow through one or both diodes. This current passes through the resistor and causes the appearance of a voltage across its terminals, thereby obtaining logic “1” on the output.
What are the inputs of the diodes of a circuit board?
Now at the cathode terminal of each of the the diodes is the input. This represents the input of the gates. The cathodes are all independent of each other, while the anodes of the diodes are all tied common together. Know that the same voltage you connected to the pull-up resistor must be connected to the inputs of the gates.
Is the negative or gate the same as positive and gate?
Hence, we conclude that the negative OR gate is the same as the positive AND gate. It may be shown that the above equivalence is true not only for diode logic but is valid irrespective of the hardware used for implementing the circuit. The inputs A, B and C can have only one of the two possible states namely 0 and 1.