15 Questions
What type of gate is a transmission gate (TG)?
An analog gate similar to a relay
How does the PMOS transistor behave in a transmission gate?
Passes a strong 1 but poor 0
How does the NMOS transistor behave in a transmission gate?
Passes a strong 0 but poor 1
How are the gate terminals of the two transistors connected in a transmission gate?
Connected to each other by a NOT gate (inverter)
How are the substrate terminals connected in a transmission gate?
Connected to the respective supply potential
What is the function of a transmission gate (TG)?
Conduct in both directions or block by a control signal with almost any voltage potential
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
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
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
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
What type of gate is a transmission gate (TG)?
NAND gate
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
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
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
What does a transmission gate (TG) primarily function as?
An analog gate similar to a relay
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.
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.
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