Chapter 10: Amplifiers, Specifications & External Characteristics

These flashcards cover key concepts from the lecture notes on amplifiers, including basic definitions, operational principles, and characteristics.

An amplifier takes a small input signal and produces a larger __.

output signal.

The voltage gain (Av) of an amplifier is defined as __.

the ratio of output voltage to input voltage.

Loading effects in amplifiers can cause a reduction in __.

voltage.

In a non-inverting amplifier, the output voltage is in __ with the input voltage.

the same phase.

The actual gain of an amplifier (Av) is usually __ than the ideal open circuit gain (Avo).

less.

Cascaded amplifiers share a __ for current return.

common ground.

Overall voltage gain of cascaded amplifiers is the __ of individual gains.

product.

The input resistance (Ri) of an amplifier represents the __ seen at the input terminals.

resistance.

The output resistance (Ro) limits the __ delivered to the load.

current.

Current gain (Ai) is the ratio of __ current to input current.

output.

Power gain (G) is a product of __ and resistance seen at the input terminals.

current.

Power amplifiers require __ to operate efficiently.

DC power.

In an amplifier, the __ power comes from the input signal.

signal source.

The relation Pi + Ps = Po - Pd describes the __ relationship in power transfers.

equivalence.

An amplifier with high input impedance avoids __ on the source.

loading.

The frequency response of an amplifier indicates how gain changes with __.

frequency.

The term __ refers to amplifying a small range of frequencies centered around a specific frequency.

narrowband.

Common-Mode Rejection Ratio (CMRR) is a measure of how well an amplifier can reject __ signals.

common-mode.

Offset voltage (Vot) can occur even when the input signal is __.

zero.

The purpose of a balancing circuit is to reduce __ currents in amplifiers.

bias.

High-frequency limitations in amplifiers can be caused by __ and stray capacitances.

inductances.

Ideal op-amps have __ input and output impedances.

infinite.

The concept of half-power points refers to frequencies where gain drops to __ dB.

-3.

Differential amplifiers amplify the __ between two input signals.

difference.

An ideal transconductance amplifier converts input __ to proportional output current.

voltage.

The small currents flowing into both input terminals are referred to as __ currents.

bias.

__ gain indicates how much signal the amplifier outputs compared to its input under ideal conditions.

Differential.

Amplifiers are often modeled as __ sources to describe their behavior accurately.

controlled.

High output impedance enables an amplifier to keep output current __ regardless of load changes.

constant.

The formula for calculating gain in decibels (dB) is __.

20 log(Av).