Complementary current-mode biquad with high linearity
AssigneeQUALCOMM Incorporated
InventorsTimothy Donald Gathman, Lai Kan Leung
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Abstract
Certain aspects of the present disclosure provide methods and apparatus for processing signals using a current-mode biquad filter, which may have a tunable bias current and/or tunable capacitance. One example apparatus is a current-mode biquad filter circuit that includes a first input current node, a first capacitive element coupled to the first input current node, a first output current node, a first active filter circuit coupled between the first input current node and the first output current node, and a second active filter circuit coupled between the first input current node and the first output current node. The second active filter circuit is complementary to the first active filter circuit.
Claims26
A current-mode biquad filter circuit comprising:
- a first input current node;
- a first capacitive element coupled to the first input current node;
- a first output current node;
- a first active filter circuit coupled between the first input current node and the first output current node;
- and
- a second active filter circuit coupled between the first input current node and the first output current node, the second active filter circuit being complementary to the first active filter circuit.
A method of signal processing, the method comprising:
- receiving an input current signal at an input current node of a current-mode biquad filter circuit, wherein the current-mode biquad filter circuit further comprises:
- a capacitive element coupled to the input current node;
- an output current node;
- a first active filter circuit coupled between the input current node and the output current node;
- and
- a second active filter circuit coupled between the input current node and the output current node, the second active filter circuit being complementary to the first active filter circuit;
- and
- filtering the input current signal to generate an output current signal at the output current node using the current-mode biquad filter circuit.
Dependencies are inferred from the claim text.