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    • 3. 发明授权
    • Broadband cable modem amplifier with programmable bias current
    • 具有可编程偏置电流的宽带电缆调制解调器放大器
    • US06552614B1
    • 2003-04-22
    • US09708691
    • 2000-11-08
    • Phillip Sean StetsonNeil GibsonMarco CorsiJim Quarfoot
    • Phillip Sean StetsonNeil GibsonMarco CorsiJim Quarfoot
    • H03G310
    • H03F1/30H03G3/001
    • An upstream programmable gain amplifier (PGA) (114, 214) for a cable modem (100) having a programmable bias current. PGA (114, 214) includes a bias current-setting circuit (140, 240) coupled to a power amplifier stage (136, 236), the bias current-setting circuit (140, 240) adapted to program the bias current Ibias of the power amplifier stage (136, 236). The bias current-setting circuit (140) includes a bandgap generator (130, 230) having an external bias resistor R1 at the input. The bias current-setting circuit (140) may include a variable gain amplifier (VGA) (134), a digital-to-analog converter (DAC) (132), and a bias code generator (138). The bias current-setting circuit (240) may alternatively include a plurality of programmable resistors R1a, R1b . . . R1x coupled to a bias code generator (238).
    • 一种用于具有可编程偏置电流的电缆调制解调器(100)的上游可编程增益放大器(PGA)(114,214)。 PGA(114,214)包括耦合到功率放大器级(136,236)的偏置电流设定电路(140,240),所述偏置电流设置电路(140,240)适于编程所述偏置电流Ibias 功率放大器级(136,236)。 偏置电流设定电路(140)包括在输入端具有外部偏置电阻器R1的带隙发生器(130,230)。 偏置电流设定电路(140)可以包括可变增益放大器(VGA)(134),数模转换器(DAC)(132)和偏置代码发生器(138)。 偏置电流设定电路(240)可以替代地包括多个可编程电阻器R1a,R1b。 。 。 R1x耦合到偏置码发生器(238)。