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But without a DC feedback, the "amplifier" can't achieve a meaningful operation point. Without it, you can't predict the operation point of the output stage and so you can't calculate impedances. In so far Audioguru is quite right: "Amplifiers don't work like that".
Furthermore, the purpose of at least the first current mirror is mysterious. I also wonder, if the connection of first stage collector to the base of output stage driver is possibly a drawing error.
The circuit looks different today. Yesterday the first transistor and its biasing did not use the -4.5V supply. I don't know why it has a collector resistor since the current mirror can be its collector load.
The output transistors have only a single diode so they will produce crossover distortion if a miracle biases the driver transistor correctly.
i just a new learner on designing a low noise amplifier..could you please help in how to choose the best semiconductor in designing a 868MHz low noise amplifier...and the step on desig it...thanks
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