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US 2010/0075624 A1Published application
Dc-offset-correction system and method for communication receivers
AssigneeAnalog Devices, Inc.
InventorHyman Shanan
Life of this patent
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Abstract
Static and dynamic DC offsets in receivers may be cancelled in two stages using a digitally implemented offset-correction loop.
Claims48
A method for cancelling an offset in a receiver circuit using an offset-correction loop, the method comprising:
- cancelling a static offset during a first cancellation stage;
- and
- cancelling a dynamic offset during a second cancellation stage following the first cancellation stage.
A system for cancelling an offset in a receiver using an offset-correction loop, the system comprising:
- an offset-correction circuit for cancelling a static offset of the receiver during a first cancellation stage and cancelling a dynamic offset of the receiver during a second cancellation stage following the first cancellation stage;
- and
- a controller for effecting a transition of the offset-correction circuit from the first cancellation stage to the second cancellation stage.
A method for cancelling an offset in a receiver using an offset-correction loop, the method comprising:
- converting an analog output signal of the receiver to a digital signal;
- integrating the digital signal;
- measuring a magnitude of a digital offset level in the digital signal;
- scaling the integrated digital signal based at least in part on the magnitude of the digital offset level, thereby changing a bandwidth of the offset-correction loop;
- converting the scaled integrated digital signal to an analog offset-correction signal;
- and
- combining the analog offset-correction signal with the input signal, thereby cancelling at least a portion of the offset in the receiver.
4 more elements
A system for cancelling an offset in a receiver using an offset-correction loop, the system comprising:
- an ADC for converting an analog output signal of the receiver to a digital signal;
- an integrator for integrating the digital signal, thereby producing an integrated digital signal;
- an averaging circuit for computing an average of the digital signal;
- a programmable gain element for scaling the integrated digital signal based at least in part on the average;
- a DAC for converting the scaled integrated digital signal into an analog offset-correction signal;
- and
- an adder for combining the analog offset-correction signal with an input signal of the receiver, thereby cancelling at least a portion of the offset in the receiver.
4 more elements
A wireless communication receiver system comprising:
- a receiver circuit for receiving a wireless radio-frequency input signal and down-converting it to a base-band frequency;
- an offset-correction circuit for cancelling a static offset of the receiver during a first cancellation stage and a dynamic offset of the receiver during a second cancellation stage following the first cancellation stage;
- and
- a controller for effecting a transition of the offset-correction circuit from the first cancellation stage to the second cancellation stage.
1 more element
Dependencies are inferred from the claim text.