公开(公告)号：US20140218222A1

公开(公告)日：2014-08-07

申请号：US14153251

申请日：2014-01-13

Applicant: IMAGINATION TECHNOLOGIES, LTD.

Inventor： Taku YAMAGATA ,  Adrian John ANDERSON

IPC: H03M1/08 ,  H03M1/12

CPC classification number: H03M1/08 ,  H03G3/3052 ,  H03M1/12 ,  H03M1/185

Abstract: Methods and circuits for controlling an automatic gain control (AGC) circuit wherein the AGC circuit is used to adjust the gain of a signal input to an analog to digital converter. The method includes obtaining a plurality of samples from the output of the analog to digital converter and determining whether the amplitude of each sample is greater than a threshold amplitude value. If the amplitude of a sample is greater than the threshold amplitude value then a counter value is incremented. The target average amplitude of the automatic gain control circuit is then periodically adjusted based on the counter value.

Abstract translation: 用于控制自动增益控制（AGC）电路的方法和电路，其中AGC电路用于调节输入到模数转换器的信号的增益。 该方法包括从模数转换器的输出获得多个样本，并确定每个样本的幅度是否大于阈值振幅值。 如果样本的幅度大于阈值振幅值，则计数器值增加。 然后基于计数器值周期性地调整自动增益控制电路的目标平均幅度。