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Transistor synthesized inductor

The invention provides a transistor synthesized inductor which comprises a direct-current blocking capacitor, a first trans-conductance amplifier, a second trans-conductance amplifier, a feedback transistor, a first current mirror and a second current mirror. The two trans-conductance amplifiers are respectively a positive trans-conductance amplifier and a negative trans-conductance amplifier and are connected in a crossed mode to form a gyrator, the gyrator gyrates an input capacitor of the second trans-conductance amplifier into an equivalent inductor. A current mirror feedback ring formed by the two current mirrors and the feedback transistor is connected between the input ends of the two trans-conductance amplifiers in a bridging mode and used for decreasing quality factor Q-value change caused by change of input signal amplitude. When the amplitude of an input signal of the transistor synthesized inductor changes, a Q-value is basically kept constant. The transistor synthesized inductor having the constant Q-value is used in a voltage control (current control) oscillator, and phase noise of the oscillator can be reduced.