Transmission Gate Quiz

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Questions and Answers

What type of gate is a transmission gate (TG)?

A logic gate similar to an AND gate

A digital gate similar to a flip-flop

An analog gate similar to a relay (correct)

A gate similar to a multiplexer

How does the PMOS transistor behave in a transmission gate?

Blocks both strong 1 and 0

Passes strong 0 and strong 1 equally well

Passes a strong 1 but poor 0 (correct)

Passes a strong 0 but poor 1

How does the NMOS transistor behave in a transmission gate?

Passes strong 0 and strong 1 equally well

Blocks both strong 1 and 0

Passes a strong 0 but poor 1 (correct)

Passes a strong 1 but poor 0

How are the gate terminals of the two transistors connected in a transmission gate?

Connected to each other by a NOT gate (inverter) Signup and view all the answers

How are the substrate terminals connected in a transmission gate?

Connected to the respective supply potential Signup and view all the answers

What is the function of a transmission gate (TG)?

Conduct in both directions or block by a control signal with almost any voltage potential Signup and view all the answers

How is a transmission gate (TG) structurally constructed?

It is made up of two field-effect transistors (FET) connected in parallel with the drain and source terminals of the two transistors connected together Signup and view all the answers

What is the role of the substrate terminals in a transmission gate (TG)?

To ensure that the parasitic substrate diode is always reversely biased and does not affect signal flow Signup and view all the answers

How do PMOS and NMOS transistors behave in a transmission gate (TG)?

PMOS passes a strong 1 but poor 0, and NMOS passes strong 0 but poor 1 Signup and view all the answers

How are the gate terminals of the two transistors connected in a transmission gate (TG)?

They are connected to each other by a NOT gate (inverter) to form the control terminal Signup and view all the answers

What type of gate is a transmission gate (TG)?

NAND gate Signup and view all the answers

How does the behavior of NMOS differ from PMOS in a transmission gate?

NMOS passes strong 0 and weak 1, while PMOS passes strong 1 and weak 0 Signup and view all the answers

What is the purpose of connecting the substrate terminal of the p-channel MOSFET to the positive supply potential in a transmission gate?

To ensure that the parasitic substrate diode is reverse biased Signup and view all the answers

How are the drain and source terminals of the two transistors connected in a transmission gate?

The drain terminals are connected together, and the source terminals are connected together Signup and view all the answers

What does a transmission gate (TG) primarily function as?

An analog gate similar to a relay Signup and view all the answers

Study Notes

Transmission Gate (TG)

A transmission gate (TG) is a type of bilateral switch, which can operate in both directions, allowing voltage to flow from input to output and vice versa.
In a transmission gate, the PMOS transistor behaves as a resistance when the input voltage is high, allowing the output to follow the input, and as an open circuit when the input voltage is low, blocking the output.
The NMOS transistor behaves in the opposite way, acting as a resistance when the input voltage is low, and as an open circuit when the input voltage is high.
The gate terminals of the two transistors (PMOS and NMOS) are connected together, and to the input signal.
The substrate terminals of the two transistors are connected to their respective supply potentials, with the p-channel (PMOS) substrate connected to the positive supply potential and the n-channel (NMOS) substrate connected to the negative supply potential.
The primary function of a transmission gate is to act as a switch, allowing or blocking the flow of voltage between the input and output.
A transmission gate is structurally constructed with two transistors, one PMOS and one NMOS, with their sources and drains connected in parallel, and their gates connected together.
The substrate terminals play a crucial role in a transmission gate, as they help to prevent unwanted current flow and ensure proper switching operation.
The PMOS and NMOS transistors in a transmission gate behave in a complementary manner, with the PMOS conducting when the input is high, and the NMOS conducting when the input is low.
The gate terminals of the two transistors are connected together to ensure that both transistors switch simultaneously.
The purpose of connecting the substrate terminal of the p-channel MOSFET to the positive supply potential is to ensure that the transistor is properly biased and operates correctly.
The drain and source terminals of the two transistors are connected in parallel, allowing the transmission gate to operate as a bilateral switch.
A transmission gate primarily functions as a voltage-controlled switch, allowing or blocking the flow of voltage between the input and output.

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Description

Test your knowledge about transmission gates, CMOS-based analog gates that can conduct in both directions. Learn about their structure and how they function with PMOS and NMOS transistors.