| 摘要 |
PURPOSE:To attain high frequency correction even with a small capacitance of a Miller effect capacitor by connecting two resistors whose resistance is shared in response to the current inverting ratio to the base. CONSTITUTION:The resistance value of resistors R1, R2 is selected as r, r/N respectively with the current inverting ratio N of the circuit. When a current I flows to a transistor (TR) Q11 from a signal source 10, a current NI flows to a TRQ12 in response to the current inverting ratio N. The impedance at a point A is increased while the resistors R1, R2 are connected in series in addition to the resistance of the Q11. Thus, the time constant with a capacitor C11 is increased consequently, the high cut-off frequency is lowered and the high frequency correcting effect is obtained by the share of the connection of the resistors R1, R2 without changing the capacitance of the capacitor C11.
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