| 摘要 |
PURPOSE:To obtain circuitry which when integrated, uses a minimum number of pins and is suitable for a VTR, etc., by providing an adder, a limiter circuit part, a differential amplifier, and a negative feedback means and by providing an input and output sigal path with differential characteristics which correspond to frequencies. CONSTITUTION:Transistors (TR)Q1, Q2, etc., constitute an adder, TRsQ3-Q6, etc., a limiter circuit, TRsQ7 and Q8, etc., an emitter follower circuit, and TRsQ9 and Q10, etc., a differential amplifier. A signal inputted from an input signal line 21 is inputted to the TRsQ7 and Q8 through the TRQ1 and the limiter circuit part to obtain a differential output between output lines 28 and 27, and the output passes through the TRsQ9-Q10 and is inputted as a negative feedback component to the base of the TRQ4 through the TRQ2. In this negative feedback loop, an integrator of a resistance 33 and a capacitor 35 operates as a load circuit of the TRQ10 to decrease the quantity of the feedback at a high frequency, thus obtaining differential characteristics on the whole. |
