Differential Amplifier Quiz

What is the main advantage of a differential amplifier?

• High input impedance

• High power gain

• Common-mode noise rejection

• Low output impedance

The common-mode gain of an ideal differential amplifier is:

• Zero

• One

• Infinity

• Very high

Which component is primarily responsible for biasing in a differential amplifier?

• Diode

• Resistor

• Current source

• Capacitor

In a MOS differential amplifier, the differential gain depends on:

• Transconductance

• Threshold voltage

• Channel-length modulation

• Substrate bias

The basic Gilbert cell is used as a:

• Differential amplifier

• Mixer

• Oscillator

• Rectifier

Active current mirrors improve performance by:

• Reducing voltage gain

• Reducing output resistance

• Increasing current matching accuracy

• Increasing power dissipation

Cascode current mirrors provide:

• High output impedance

• High current gain

• High input impedance

• Low voltage swing

The purpose of a MOS load in a differential pair is:

• To provide a constant current source

• To improve biasing

• To act as a resistive load

• To increase slew rate

Which technique improves the bandwidth of a differential amplifier?

• Increasing the capacitance

• Using a larger resistor load

• Reducing the supply voltage

• Increasing the tail current

Common-mode rejection ratio (CMRR) is the ratio of:

• Differential gain to common-mode gain

• Common-mode gain to differential gain

• Output impedance to input impedance

• Voltage gain to power gain