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    • 7. 发明授权
    • Method and apparatus for calibrating and equalizing a multi-channel
automatic gain control amplifier
    • 用于校准和均衡多通道自动增益控制放大器的方法和装置
    • US4794343A
    • 1988-12-27
    • US926317
    • 1986-10-31
    • Steve S. Yang
    • Steve S. Yang
    • H03F1/30G01S20060101G01S7/34G01S7/40G01S13/44H03G20060101H03G1/04H03G3/00H03G3/10H03G3/30H03F3/68
    • H03G3/00G01S13/4436G01S7/4021
    • A plurality of amplifier channels, wherein each channel is automatically gain controlled by a gain control signal and wherein the gain of each channel is a known function of a plurality of constants of corresponding to each amplifier and of the gain control signal, can be calibrated by the following method. The method comprising the steps of measuring each output of each amplifier at a corresponding plurality of gain control values and at a corresponding input to each amplifier. The number of the plurality of the constants equals the number of the plurality of the gain control values. The method continues by computing the gain of each amplifier at the step of measuring. The constants corresponding to each amplifier are then computed according to the function and computed gain. A corresponding changed gain control signal is applied to each amplifier according to the function to set the corresponding gain of each amplifier to a corresponding predetermined calibrated value. By virtue of this methodology, the gain of each channel of a multiple channel amplifier can be not only calibrated to equal a preset value, but the gains of each of the channels can be matched, all without the use of any other additional test equipment.
    • 多个放大器通道,其中每个通道由增益控制信号自动增益控制,并且其中每个通道的增益是对应于每个放大器和增益控制信号的多个常数的已知功能,可以通过 以下方法。 该方法包括以对应的多个增益控制值和每个放大器的相应输入端测量每个放大器的每个输出的步骤。 多个常数的数量等于多个增益控制值的数量。 该方法通过在测量步骤中计算每个放大器的增益来继续。 然后根据功能和计算的增益计算对应于每个放大器的常数。 根据用于将每个放大器的相应增益设置为相应的预定校准值的功能,将对应的改变的增益控制信号施加到每个放大器。 凭借这种方法,多通道放大器的每个通道的增益不仅可以校准为等于预设值,而且可以匹配每个通道的增益,而不需要使用任何其他附加的测试设备。
    • 8. 发明授权
    • Cascaded internal impedance dependent amplifier with accurate variable
gain control
    • 级联的内部阻抗相关放大器,具有精确的可变增益控制
    • US4677392A
    • 1987-06-30
    • US809628
    • 1985-12-16
    • Steve S. Yang
    • Steve S. Yang
    • H03F1/30G01S7/34G01S7/40G01S13/44H03G20060101H03G1/04H03G3/00H03G3/10H03G3/30
    • H03G3/3057G01S13/4436G01S7/4021H03G3/00
    • An internal impedance dependent amplifier has a gain as determined by the impedance at a predetermined node within the amplifier. A PIN diode is coupled to the predetermined node. The PIN diode is driven with a forward biased current which serves as the accurate gain control (AGC) signal for the amplifier. In the preferred embodiment, the PIN diode is driven by an operational amplifier in such a manner that the impedance thus coupled to the predetermined node in the amplifier is temperature independent. Because the PIN diode has an impedance given by:log R=A+B log Ip,whereR is the impedance of the PIN diode;IP is the forward biasing current; andA and B constants which are different for each PIN diode,the AGC voltage applied to the operational amplifier driving the PIN diode is linear with respect to the impedance of the PIN diode and hence is also linear with respect to the voltage gain of the impedance controlled amplifier to which the PIN diode is coupled. This characteristic of the gain of the amplifier allows the amplifier to be cascaded in series and to preserve the same impedance relation as expressed above for the cascaded series of amplifiers as well. Thus, the gain in dB of the cascaded series of amplifiers is log linear with respect to a common AGC voltage applied to each of the amplifiers of the series.
    • 内部阻抗相关放大器具有由放大器内的预定节点处的阻抗确定的增益。 PIN二极管耦合到预定节点。 PIN二极管由正向偏置电流驱动,作为放大器的精确增益控制(AGC)信号。 在优选实施例中,PIN二极管由运算放大器驱动,使得这样耦合到放大器中的预定节点的阻抗是温度无关的。 因为PIN二极管的阻抗由下式给出:log R = A + B log Ip,其中R是PIN二极管的阻抗; IP是正向偏置电流; 和对于每个PIN二极管不同的A和B常数,施加到驱动PIN二极管的运算放大器的AGC电压相对于PIN二极管的阻抗是线性的,因此也相对于阻抗的电压增益是线性的 PIN二极管耦合到的控制放大器。 放大器增益的这一特性允许放大器串联级联,并保持与上面级联放大器系列相同的阻抗关系。 因此,级联串联放大器的dB增益相对于施加到串联的每个放大器的公共AGC电压是对数线性的。