Complementary current mode bi-second order with high linearity

Certain aspects of the present disclosure provide methods and apparatus for processing a signal using a current mode bi-second order filter, which may have a tunable bias current and/or a tunable capacitance. One example apparatus is a current-mode dual second order filter circuit (402), the invention relates to a power amplifier comprising a first input current node (502), a first capacitive element (CI) coupled to the first input current node, a first output current node (506), a first active filter circuit (510) coupled between the first input current node and the first output current node, and a second active filter circuit (520) coupled between the first input current node and the first output current node. The second active filter circuit (520) is complementary to the first active filter circuit (510). 本公开的某些方面提供了用于使用电流模式双二阶滤波器来处理信号的方法和装置，电流模式双二阶滤波器可以具有可调谐偏置电流和/或可调谐电容。一个示例装置是电流模式双二阶滤波器电路(402)，其包括第一输入电流节点(502)、耦合到第一输入电流节点的第一电容元件(CI)、第一输出电流节点(506)、耦合在第一输入电流节点与第一输出电流节点之间的第一有源滤波器电路(510)、以及耦合在第一输入电流节点与第一输出电流