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    • 1. 发明申请
    • ADJUSTABLE GAIN FOR MULTI-STACKED AMPLIFIERS
    • 可调增益用于多层放大器
    • WO2014078742A2
    • 2014-05-22
    • PCT/US2013/070434
    • 2013-11-15
    • QUALCOMM INCORPORATED
    • CHA, JeongwonLEE, Chang-HoHADJICHRISTOS, Aristotele
    • H03F1/02
    • H03F1/0277H03F1/223H03F1/523H03F3/211H03F3/245H03F2200/61H03K17/102
    • Techniques for providing adjustable gain in an amplifier. In an aspect, a composite amplifier having adjustable gain includes a plurality of amplifiers coupled in parallel, wherein each of the amplifiers may be turned on or off to adjust the overall gain of the composite amplifier. Each amplifier may include an input transistor and at least two cascode transistors. To turn each amplifier off, the gate voltage of a second or lowermost cascode transistor coupled to the input transistor may be grounded, and the gate voltage of a first cascode transistor coupled to the output voltage may be coupled to a first turn-off voltage to reduce the drain-to-gate voltage drop across the first cascode transistor. Further aspects provide for decoupling a capacitor coupled to the gates of the cascode transistors from AC ground when the amplifier is turned off.
    • 在放大器中提供可调增益的技术。 一方面,具有可调节增益的复合放大器包括并联耦合的多个放大器,其中每个放大器可以被开启或关闭以调节复合放大器的整体增益。 每个放大器可以包括输入晶体管和至少两个共源共栅晶体管。 为了关闭每个放大器,耦合到输入晶体管的第二或最低级联晶体管的栅极电压可以接地,并且耦合到输出电压的第一级联晶体管的栅极电压可以耦合到第一关断电压以 降低第一共源共栅晶体管两端的漏极至栅极压降。 进一步的方面提供了当放大器关闭时将耦合到共源共栅晶体管的栅极的电容器与交流地断开。