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Numerical examples of current mirror circuits are presented with a focus on their application in MOSFET and BJT configurations. Key improvements, such as the introduction of a cascode transistor to enhance output resistance and minimize non-ideality factors, are emphasized. The chapter illustrates the calculations involved in determining voltages and currents in various configurations while maintaining the operational conditions for high output resistance.
Chapter 1621 sections
Numerical examples of current mirror circuits are presented with a focus on their application in MOSFET and BJT configurations. Key improvements, such as the introduction of a cascode transistor to enhance output resistance and minimize non-ideality factors, are emphasized. The chapter illustrates the calculations involved in determining voltages and currents in various configurations while maintaining the operational conditions for high output resistance.
Adding a cascode transistor in current mirrors enhances the output resistance and reduces sensitivity to voltage variations.
Different sizes and current ratios of transistors can be utilized to achieve desired biasing and performance in current mirror circuits.
For BJT current mirrors, approximating V_BE close to 0.6 V simplifies calculations related to voltage and current.
A circuit configuration that mirrors the current from a reference branch to an output branch, allowing precise current sourcing and sinking.
A transistor placed in series with another to improve the output resistance and reduce the effect of voltage changes on output current.
The resistance seen by the output terminals of the current mirror, critical for determining how much the output current varies with changes in output voltage.
Total Questions
2
Estimated Time
4 min
Passing Score
70%
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