公开(公告)号：KR1020000074616A

公开(公告)日：2000-12-15

申请号：KR1019990018666

申请日：1999-05-24

Applicant: 삼성전자주식회사

Inventor： 이진국 ,  장동영 ,  차유진 ,  강근순 ,  이승훈

IPC: H03G3/20

CPC classification number: H03G1/0094 ,  G06G7/06 ,  G06J1/00

Abstract: PURPOSE: A gain controller using a switched capacitor method is provided whose operation speed is improved to automatically control a gain of an input signal at a high operational speed and power consumption is decreased to settle the gain to a desired value. CONSTITUTION: A gain controller using a switched capacitor method includes an operational amplifier(30) outputting a result obtained by controlling the gain of an analog input signal, input capacitors(C1-Cn, CN+1-C2N) connected to the input of the operational amplifier in parallel, a feedback capacitors(CF3,CF4) connected to the input and output of the operational amplifier, and switches(40,42,44,46,50,52,56,32,34,36) connecting at least one input capacitor to the input signal or a reference voltage, corresponding to a digital gain control signal applied from the outside. The gain is expressed by a ratio of an input capacitance that is the sum of the capacitances of the capacitors connected to the input voltage to the capacitance of the feedback capacitor.

Abstract translation: 目的：提供一种使用开关电容法的增益控制器，其运行速度得到改善，可以在高运行速度下自动控制输入信号的增益，并降低功耗以将增益调整到所需值。 构成：使用开关电容器方法的增益控制器包括输出通过控制模拟输入信号的增益获得的结果的运算放大器（30），连接到模拟输入信号的输入的输入电容器（C1-Cn，CN + 1-C2N） 并联的运算放大器，连接到运算放大器的输入和输出的反馈电容器（CF3，CF4）以及至少连接的开关（40,42,44,46,50,52,56,32,34,36） 输入信号的一个输入电容或与从外部施加的数字增益控制信号相对应的参考电压。 增益由输入电容的比值表示，输入电容是连接到输入电压的电容器的电容与反馈电容器的电容之和的总和。