Patent ID: 6985711

Claim:
A DC offset cancellation block in an RF receiver having a direct converter for direct down conversion of a received RF signal to a baseband signal, said DC offset cancellation block comprising: offset adjustment means for removing static DC components from said baseband signal; a coarse-grain loop for removing large portions of said static DC components and time-varying DC components from said baseband signal; a fine-grain loop for removing said static and said time varying DC components from said baseband signal; and a digital-to-analog converter controller (DACC) for removing large portions of said static DC components and slowly time-varying DC components by means of updating a digital-to-analog converter in said direct converter with a DC offset based on gain setting, receive frequency changes, and temperature changes of a low noise amplifier (LNA), a mixer, a baseband filter and an analog-to-digital converter (ADC) from a front end of said RF receiver; wherein said offset adjustment means, said coarse-grain loop, said fine-grain loop, and said DACC interact with one another to remove unwanted DC offsets in said RF receiver.