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US08344795B2 Self-calibrated, broadband, tunable, active filter with unity gain cells for multi-standard and/or multiband channel selection 有权
自校准，宽带，可调谐，有源滤波器，具有用于多标准和/或多频段通道选择的单位增益单元

Self-calibrated, broadband, tunable, active filter with unity gain cells for multi-standard and/or multiband channel selection
Abstract:
An exemplary filter includes N (≧2) unity gain amplifiers, each with a pair of differential input terminals and a pair of differential output terminals; a pair of filter differential input terminals; a first pair of variable resistances coupling the pair of filter differential input terminals to the pair of differential input terminals of the first unity gain amplifier; N−1 pairs of variable resistances coupling the pairs of differential output terminals of each of the N unity gain amplifiers, other than the last one, to the pairs of differential input terminals of its downstream neighbor; N−1 pairs of variable capacitances coupling the pairs of differential input terminals of each of the N unity gain amplifiers, other than the last one, to the pairs of differential output terminals of its downstream neighbor; and a variable capacitance coupling the pair of differential input terminals of the last unity gain amplifier to each other.
Abstract(Chinese):

示例性滤波器包括N（≥2）个单位增益放大器，每个具有一对差分输入端子和一对差分输出端子; 一对滤波器差分输入端子; 将所述一对滤波器差分输入端耦合到所述第一单位增益放大器的所述一对差分输入端的第一对可变电阻; N-1对可变电阻，将除了最后一个之外的N个单位增益放大器中的每一个的差分输出端子对耦合到其下游邻近的差分输入端子对; N-1对可变电容，将除了最后一个之外的N个单位增益放大器中的每一个的差分输入端的对耦合到其下游邻居的差分输出端对; 以及将最后一个单位增益放大器的该对差分输入端彼此耦合的可变电容。

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