87. Numerical examples on current mirror and its applications (Part-B)
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.
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What we have learnt
- 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.
Key Concepts
- -- Current Mirror
- A circuit configuration that mirrors the current from a reference branch to an output branch, allowing precise current sourcing and sinking.
- -- Cascode Transistor
- A transistor placed in series with another to improve the output resistance and reduce the effect of voltage changes on output current.
- -- Output Resistance
- 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.
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