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The chapter discusses the implementation of current mirrors in differential amplifiers, particularly focusing on BJT configurations. It emphasizes the advantages of using current mirrors for setting bias currents and how these configurations impact both common mode and differential mode gains. The chapter also compares passive and active loads and explores the significance of the common mode rejection ratio.
Chapter 1316 sections
The chapter discusses the implementation of current mirrors in differential amplifiers, particularly focusing on BJT configurations. It emphasizes the advantages of using current mirrors for setting bias currents and how these configurations impact both common mode and differential mode gains. The chapter also compares passive and active loads and explores the significance of the common mode rejection ratio.
Current mirrors are essential for establishing tail currents in differential amplifiers.
Replacing passive loads with active loads significantly enhances gain performance.
The common mode rejection ratio (CMRR) remains a crucial metric for amplifier performance.
A differential amplifier amplifies the difference between two input voltages, rejecting any input signal common to both.
A current mirror is a circuit configuration that outputs a constant current regardless of the load, making it useful for biasing and current sources.
The gain of an amplifier for signals that are common to both inputs; ideally, this should be minimized for better amplifier performance.
The gain of an amplifier for signals that differ between the two inputs; higher differential gain is desirable.
The ratio of differential gain to common mode gain, indicating the ability of the amplifier to reject common input signals.
Total Questions
2
Estimated Time
4 min
Passing Score
70%
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