Patent ID: 7855594
Filing Date: 2010-12-21
Classification: H03J

Abstract:
1. A quadrature filter comprising: an integrator to receive an input signal at an input node and generate an output signal at an output node; a fixed resistor coupled to the integrator; a plurality of resistors coupled to the fixed resistor in parallel, wherein a value of the fixed resistor is lower than a value of any of the plurality of resistors; and a plurality of switches, wherein each of the plurality of switches is coupled in series to at least one of the plurality of resistors, wherein: an output node of the integrator is to be coupled to an input node of a second integrator, an output node of the second integrator is to be coupled to an input node of the integrator and an input node of a third integrator, and an output node of the third integrator is to be coupled to the output node, the input node of the second integrator, and the output node of the integrator.