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    • 2. 发明公开
    • 적응 바이어싱을 이용하는 고스윙 연산 증폭기 출력 스테이지
    • 使用自适应偏置的高电平运算放大器输出级
    • KR1020100046261A
    • 2010-05-06
    • KR1020107005944
    • 2008-08-21
    • 퀄컴 인코포레이티드
    • 다바크하이크서동원미시라마누
    • H03F1/52H03F3/30H03F3/45
    • H03F3/45192H03F1/52H03F1/523H03F3/303H03F2203/30015H03F2203/30084H03F2203/30117H03F2203/45244H03F2203/45626H03F2203/45732
    • An output stage (123) includes two transistors (T3, T4) (switching transistor, and biasing transistor) coupled in series in a pullup current path between a VDDA node and an output node, (120) and also includes two transistors (Tl, T2) (switching transistor and biasing transistor) coupled in series in a pulldown current path between the output node (121) and a ground node. Providing the biasing transistors (T2,T4) reduces the maximum voltage dropped across the transistors, thereby allowing the transistors to have lower breakdown voltages than VDDA. An adaptive biasing circuit adjusts the gate voltage on a biasing transistor (T2,T4) based on the output node (121) voltage. If the output voltage is in a midrange, then the gate voltage is set farther away from a rail voltage in order to reduce voltage stress. If the output voltage is in a range closer to the rail voltage, then the gate voltage is set closer to the rail voltage, thereby facilitating rail-to-rail output voltage swings.
    • 输出级(123)包括在VDDA节点和输出节点之间的上拉电流路径中串联耦合的两个晶体管(T3,T4)(开关晶体管和偏置晶体管)(120),并且还包括两个晶体管(T1, T2)(开关晶体管和偏置晶体管),其串联耦合在输出节点(121)和接地节点之间的下拉电流路径中。 提供偏置晶体管(T2,T4)降低了跨越晶体管的最大电压,从而允许晶体管具有比VDDA更低的击穿电压。 自适应偏置电路基于输出节点(121)电压来调节偏置晶体管(T2,T4)上的栅极电压。 如果输出电压处于中频范围,则栅极电压被设置得更远离轨道电压,以便减小电压应力。 如果输出电压在更接近导轨电压的范围内,则栅极电压被设置为更接近导轨电压,从而便于轨至轨输出电压摆动。