Patent ID: 6272323
Filing Date: 2001-08-07
Classification: H03G

Abstract:
An AGC amplifier control circuit, comprising:a RF attenuator;a digital/analog converter converting control voltage data to analog voltage;an AGC amplifier making gain change by the output value of said digital/analog converter, wherein said AGC amplifier makes a gain change in a nonlinear manner with respect to said control voltage;an attenuator controller controlling said RF attenuator in hysteresis and outputting the information whether said RF attenuator is driven and has a fixed attenuation quantity or not at the next gain renewing time of said AGC amplifier;a memory memorizing the control voltage data of the gain of said AGC amplifier with the relation of a desired output at the time when said RF attenuator does not have an attenuation quantity, anda data conversion circuit provided in front of said memory,said data conversion circuit converts the data to make the gain of said AGC amplifier increase corresponding to said attenuation quantity at the time when said RF attenuator is driven and has a fixed attenuation quantity.