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    • 4. 发明授权
    • 가변구동력을갖는디스플레이구동장치및이를이용한디스플레이시스템
    • KR100382383B1
    • 2003-07-18
    • KR1019980037540
    • 1998-09-11
    • 르네사스 일렉트로닉스 가부시키가이샤
    • 하시모또요시하루아베가쓰미야마모또게이찌
    • G09G5/32
    • G09G3/3688G09G2320/02H03F1/30H03F3/45183H03F2203/45508H03F2203/45726H03F2203/45732
    • A source driver according to the present invention is comprised of a bias circuit 2 and an output circuit 2. In the output circuit 21, a differential unit 21 amplifies the difference between two input signals received through input terminals. An output unit made up of the transistors, and a capacitor, receives a signal from the differential unit, amplifies it, outputting it to a liquid crystal display (not shown) via a variable-resistance unit with analog switches. A selection circuit causes each of the analog switches to be activated or deactivated. A bias current circuit changes a current flowing through a differential amplification circuit made up of the transistors. A bias current changing circuit changes a bias current flowing through a circuit made up of a transistor. A bias circuit receives an external voltage, exerting a control of the bias current flowing through respective bias current changing circuits. A bias voltage selection circuit changes a bias voltage output from the bias unit, and then sends it to the bias current changing circuits.
    • 根据本发明的源极驱动器包括偏置电路2和输出电路2.在输出电路21中,差分单元21放大通过输入端子接收的两个输入信号之间的差。 由晶体管构成的输出单元和电容器从差分单元接收信号,将其放大,并通过具有模拟开关的可变电阻单元将其输出到液晶显示器(未示出)。 选择电路使每个模拟开关被激活或停用。 偏置电流电路改变流过由晶体管组成的差分放大电路的电流。 偏置电流改变电路改变流过由晶体管构成的电路的偏置电流。 偏置电路接收外部电压,施加流过相应偏置电流改变电路的偏置电流的控制。 偏置电压选择电路改变从偏置单元输出的偏置电压,然后将其发送到偏置电流改变电路。
    • 6. 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。