| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve such limiter characteristics that unwanted waveform deformation does not occur. <P>SOLUTION: A differential amplifier circuit included in a limiter circuit 10 amplifies a potential difference between a control voltage and the potential of an input signal and outputs the amplified potential difference. When the potential of the input signal exceeds the potential level of a limit voltage, current is supplied to a resistor 1 and the potential level of a node N1 is controlled not to exceed the limit voltage. Since the potential difference appears in an amplified state by using the differential amplifier circuit, when the potential of the input signal exceeds the potential level of the limit voltage, a switching element (such as an NMOS transistor 5 or a PMOS transistor 6) is speedily turned on and the current can flow to the resistor 1. Namely, ON/OFF of operation of the switching element can be accurately changed over, then, excellent limiter characteristics can be materialized. <P>COPYRIGHT: (C)2008,JPO&INPIT |
