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A source-degenerated current mirror is a type of bipolar junction transistor (BJT) current mirror circuit. It is an active circuit that uses a bipolar transistor to produce an output current that is proportional to its input current. The source degeneration in the circuit provides a form of negative feedback, which helps to stabilize the current transfer characteristic of the circuit, making it less sensitive to variations in transistor parameters.
The basic configuration of a source-degenerated current mirror circuit consists of two bipolar transistors, where the input current is applied to the base of the first transistor, and the output current is taken from the collector of the second transistor. The two transistors are typically matched, meaning they have similar transistor parameters such as collector current gain, base-emitter voltage, etc.
In a source-degenerated current mirror, the source terminal of the input transistor is connected to the collector terminal of the output transistor, which creates a feedback path between the two transistors. This feedback helps to stabilize the current transfer characteristic of the circuit, making it less sensitive to variations in transistor parameters and to changes in temperature, supply voltage, and other environmental factors.
The degeneration resistor, which is placed between the source terminal of the input transistor and ground, provides the negative feedback that is necessary to stabilize the circuit. The value of the degeneration resistor is chosen based on the desired gain, output impedance, and stability of the current mirror circuit.
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