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    • 2. 发明申请
    • ADJUSTABLE MOS RESISTOR
    • 可调电阻
    • WO2011080536A1
    • 2011-07-07
    • PCT/IB2009/055956
    • 2009-12-28
    • NXP B.V.KOHSIEK, Cord-Heinrich
    • KOHSIEK, Cord-Heinrich
    • H03H11/24
    • H03H11/245
    • A variety of circuits, methods and devices are implemented for providing an adjustable resistance. According to one such implementation an adjustable resistive device includes a metal-oxide semiconductor (MOS) transistor having a gate, a drain, a source, and a body. First circuitry controls a resistance from drain to source by applying a gate voltage that is a function of a variable control input. Second circuitry adjusts a voltage at the body according to a drain voltage and a source voltage, whereby the resistance from drain to source is substantially linear for a given value of the variable control input and over a voltage range.
    • 实现了各种电路,方法和装置以提供可调电阻。 根据一种这样的实施方案,可调电阻器件包括具有栅极,漏极,源极和主体的金属氧化物半导体(MOS)晶体管。 第一电路通过施加作为可变控制输入的函数的栅极电压来控制从漏极到源极的电阻。 第二电路根据漏极电压和源极电压来调节电压,由此对于给定的可变控制输入值和电压范围,漏极到源极的电阻基本上是线性的。
    • 5. 发明授权
    • CIRCUIT ARRANGEMENT
    • 电路
    • EP1348255B1
    • 2008-04-16
    • EP01987969.1
    • 2001-10-17
    • NXP B.V.
    • KOHSIEK, Cord-Heinrich
    • H03G7/00
    • In order to provide a circuit arrangement (100) for generating and amplifying a DC signal, referred to as level voltage, whose value is essentially proportional to the logarithm of the voltage amplitude of the input signal, the circuit arrangement comprising an amplifier circuit having at least two amplifier stages (10; 20; 30), it is proposed that: at least a differential amplifier stage (40), in particular non-negatively fed back, is arranged parallel to the last amplifier stage (30), particularly parallel to the collector circuits of the last amplifier stage (30); the differential amplifier stage (40) precedes at least a multiplier stage (50) for multiplying the output signals of the differential amplifier stage (40); for generating two differential amplifier output signals which are to be multiplied by each other, and alternatively to the differential amplifier (40), the collector currents of the transistors (36, 38) of the rectifier circuit (35) of the last amplifier stage (30) are used; and at least a current adder unit (80) is provided for adding the level voltage of the output signal of the multiplier stage (50) to the respective level voltage of the other amplifier stages.