| 摘要 |
PURPOSE:To improve the balance of frequency characteristics between differential outputs by impressing a signal input of a differential amplifier of a single input to a common emitter point of transistors (TR) of the differential amplifier via a coupling capacitor having a nearly equal capacitance as that of a stray capacitor of a TR of a constant current bias circuit. CONSTITUTION:In a differential amplifier one input of which is grounded in terms of AC and to other input of which an input signal, an input signal Vin connects to a connecting point between both emitter resistors RE1 and RE2 of differential TRs Q1, Q2 via a coupling capacitor Co, a capacitor Cs between the common emitter and ground is selected nearly equal to the coupling capacitor Cc. The constitution is simplified because the coupling capacitor has only to be added and the titled circuit is suitable for mass-production in taking the design of an integrated circuit into consideration.
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