A LINEARIZER FOR LINEARIZING A NON-LINEAR COMPONENT CONTROLLED BY CONTROL VOLTAGE

摘要

Non-linearity of a voltage-controlled non-linear amplifier/attenuator is compensated by placing a non-linear circuit in the feedback path of an operation amplifier (21) of a linearizer, the circuit comprising one or more differential amplifiers connected in parallel. For example, one amplifier (LTP1) can be a low-gain amplifier whose exponential range is at the lower end of the control voltage range (VLIN), and another can be a high-gain amplifier whose exponential range is at the upper end of the control voltage range. When a necessary number (n) of differential amplifiers are used in the feedback path, it is possible to compensate for the non-linearity of the non-linear component to a desired extent.