BJT Differential Amplifier with Active Loads

What is the purpose of using active loads in a BJT differential amplifier?

• To improve gain, linearity, and output swing of the amplifier.

• To decrease the bandwidth of the amplifier

• To reduce power consumption

• To increase noise in the amplifier

Explain the concept of common-mode rejection ratio (CMRR) in the context of a BJT differential amplifier with active loads.

• CMRR is independent of common-mode signals

• CMRR is not affected by the matching of transistors in the differential pair

• CMRR is higher when the active loads are mismatched

• CMRR in a BJT differential amplifier with active loads depends on the matching of transistors in the differential pair and the active loads, aiming for high rejection of common-mode signals.

How does the use of active loads improve the performance of a BJT differential amplifier?

• Active loads reduce gain and linearity

• Active loads increase input impedance, reduce loading effects, and enhance gain and linearity.

• Active loads introduce more loading effects

• Active loads decrease input impedance

What are the key advantages of using a BJT differential amplifier with active loads?

• Limited bandwidth, reduced gain, and poor linearity.

• Lower input impedance, worse common-mode rejection ratio, and decreased temperature stability.

• Higher input impedance, better common-mode rejection ratio, and improved temperature stability.

• Higher power consumption, increased noise, and lower voltage swing.

Discuss the role of tail current source in a BJT differential amplifier with active loads.

• The tail current source in a BJT differential amplifier with active loads has no impact on CMRR

• The tail current source in a BJT differential amplifier with active loads sets the DC operating point and improves CMRR.

• The tail current source in a BJT differential amplifier with active loads increases distortion

• The tail current source in a BJT differential amplifier with active loads reduces the gain

What is the significance of biasing in a BJT differential amplifier with active loads?

• Biasing increases the power consumption of the amplifier.

• Biasing ensures stable and linear operation of the amplifier.

• Biasing is irrelevant for the amplifier's performance.

• Biasing causes distortion in the amplifier output.

Explain the working principle of a BJT differential amplifier with active loads.

• The active loads are used to reduce the gain of the amplifier.

• The working principle involves amplifying the voltage difference between two inputs using transistors in a differential configuration with active loads to achieve high gain and common-mode rejection.

• The differential configuration is not necessary for the amplifier to function.

• The working principle involves using capacitors instead of transistors for amplification.

What are the typical applications of a BJT differential amplifier with active loads?

• Home appliances, agricultural machinery, aerospace technology

• Medical devices, automotive systems, computer hardware

• Power generation, robotics, telecommunications

• Audio amplifiers, instrumentation amplifiers, high-frequency amplifiers

Compare and contrast the performance of a BJT differential amplifier with active loads versus passive loads.

• BJT differential amplifier with active loads offers higher gain, better linearity, and improved common-mode rejection compared to passive loads.

• BJT differential amplifier with passive loads offers higher gain than active loads

• Passive loads provide better linearity in BJT differential amplifiers compared to active loads

• Active loads in BJT differential amplifiers have worse common-mode rejection than passive loads

How can the gain of a BJT differential amplifier with active loads be calculated?

• Av = gm * (RD + RD') / 2

• Av = gm / (RD || RD')

• Av = gm * (RD || RD')

• Av = gm * (RD + RD')