An active current sink mirror. Assuming resistor equality and negligible A1 offset error, A1 feedback forces Q1 to maintain accurate current sink I/O equality I₂ = I₁

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• Article «Active current mirror»
• Figure 1. An active current sink mirror. Assuming resistor equality and negligible A1 offset error, A1 feedback forces Q1 to maintain accurate current sink I/O equality I₂ = I₁
• Figure 2. An active current source mirror. This is identical to Figure 1, except this Q1 is a PFET and the polarities are swapped
• Figure 3. If adequately accurate resistors aren't handy, a trimmer pot might be useful for post-assembly trimming