# What is input and output for transconductance amplifier?

## What is input and output for transconductance amplifier?

The circuit is called the transconductance amplifier. This amplifier is a device that generates as its output a current that is a function of the difference between two input voltages, Vi and V2; that difference is called the differential input voltage. The circuit is called a differential transconductance amplifier.

## What should be the ideal value of input and output impedance of a transconductance amplifier?

Explanation: Buffer amplifiers are used to connect high input resistance source to a low output resistance load. Explanation: It is a desired characteristics of transconductance amplifier ideally. Explanation: The expression is given by 10 log AVO = 40. Solving for Avo gives 100 as the answer.

What is input and output resistance?

The output impedance refers to the impedance, or opposition to current flow, of the component that often bears an electrical source to “drive” a load component. Meanwhile, the input impedance refers to the load component’s opposition to current flowing in from the electrical source.

### What is the output resistance of the amplifier?

A power amplifier may have a rated impedance of 8 ohms, but the actual output impedance will vary depending on circuit conditions. The rated output impedance is the impedance into which the amplifier can deliver its maximum amount of power without failing.

### What is the input resistance of voltage amplifier?

2.5 Dynamic Input and Output Resistances

ideal amplifier type input resistance output resistance
voltage infinite zero
transconductance infinite infinite
current zero infinite
transresistance zero zero

What are the ideal input and output resistances of various amplifier?

The input impedance (Effective resistance between the input terminals) of the current amplifier should be equal to zero. The output impedance (Effective resistance between the output terminals) of the current amplifier should be infinite.

## Which one of the following types of negative feedback increases the input resistance and decreases the output resistance of an amplifier?

Q:- The effect of current shunt feedback in an amplifier is to. Increase the input resistance and decrease the output resistance.

## Which circuit is used as active load for an amplifier?

current mirror circuit
Usually, this “active load” takes the form of a current mirror circuit, behaving as a current regulator rather than as a true current source. Explain why the presence of an active load results in significantly more voltage gain than a plain (passive) resistor.

What is meant by input resistance?

The input resistance is the resistance seen by the current source or voltage source which drives the circuit.

### How do you calculate input resistance?

Input resistance, ri, is the resistance between the input terminals with either input grounded. In Figure 13.3, if VP is grounded, then ri = RD‖RN. The value of ri ranges from 107 Ω to 1012 Ω, depending on the type of input. Sometimes common mode input resistance, ric, is specified.

### How do you determine the input and output resistance of an amplifier?

The generalised formula for the input impedance of any circuit is ZIN = VIN/IIN. The DC bias circuit sets the DC operating “Q” point of the transistor and as the input capacitor, C1 acts as an open circuit and blocks any DC voltage, at DC (0Hz) the input impedance (ZIN) of the circuit will be extremely high.

What is the suggested value of output resistance of an amplifier?

Generally this is an undesired effect so we prefer the op amp to have a very low output impedance. The manufacturer’s specification sheet in Appendix 1 lists the typical value of output resistance for a 741 as 75 ohms.

## Why is an amplifier called a transconductance amplifier?

A transconductance amplifier converts an input of voltage to an output of current. It is also called a current to voltage converter or I to V converter. It is called transconductance because the efficiency of the amplifier is measured in units of conductance. Transconductance amplifiers are classified into two types.

## How is the voltage of a transresistance amplifier calculated?

Figure 4.10: Transresistance amplifier. The voltage difference between the two input terminals is zero. Since the voltage at the non-inverting input terminal is zero, the voltage at the inverting input terminal is zero. ? Current through feedback resistance R f can be calculated.

Which is the ideal value for the input resistance?

The Questions and Answers of The ideal values for the input resistance (Ri) and the output resistance (Ro) of a transconductance amplifier area)Ri= 0 and Ro= 0b)Ri= ∞ and R0= ∞c)Ri= 0 and R0= ∞d)Ri= ∞ and Ri= 0Correct answer is option ‘B’.

### How is current through feedback resistance ( your F ) calculated?

Current through feedback resistance R f can be calculated. Therefore, output voltage is proportional to input current. A transconductance amplifier converts an input of voltage to an output of current. It is also called a current to voltage converter or I to V converter.

13/03/2019