Scalable dynamic range analog-to-digital converter system
AssigneeMotorola Solutions, Inc.
InventorsCharles R. Ruelke, Joshua E. Dorevitch, Nir Corse
Life of this patent
Estimating the term…
Abstract
A scalable dynamic range analog-to-digital converter. In one instance, a method of scaling a dynamic range of an analog-to-digital converter is provided. The method includes operating the analog-to-digital converter at a first dynamic range. The method also includes receiving a radio frequency signal and detecting an on-channel signal level of the radio frequency signal. The method also includes when the on-channel signal level is above an on-channel threshold, operating the analog-to-digital converter at a second dynamic range. The method also includes when the on-channel signal level is below the on-channel threshold, operating the analog-to-digital converter at the first dynamic range.
Claims18
A scalable dynamic range analog-to-digital converter comprising:
- a switched capacitor sigma-delta modulator including:
- a first capacitor having a first capacitance value, and
- a second capacitor having a second capacitance value;
- and
- a receiver electronic processor that controls a switching operation of the switched capacitor sigma-delta modulator;
- wherein the receiver electronic processor receives an on-channel signal level of an on-channel signal;
- wherein the receiver electronic processor switches in the first capacitor when the on-channel signal level is below an on-channel threshold, and
- wherein the receiver electronic processor switches in the second capacitor when the on-channel signal level is above the on-channel threshold.
A mobile communications device, comprising:
- an internal antenna to receive a radio frequency (RF) signal;
- an on-channel detector coupled to the internal antenna, the on-channel detector configured to detect an on-channel signal level of the radio frequency signal;
- an analog-to-digital converter coupled to the internal antenna to convert the radio frequency signal to a digital signal and including a switched capacitor sigma-delta modulator including:
- a first capacitor having a first capacitance value;
- and
- a second capacitor having a second capacitance value;
- and
- a receiver electronic processor that controls a switching operation of the switched capacitor sigma-delta modulator;
- wherein the receiver electronic processor switches in the first capacitor when the on-channel signal level is below an on-channel threshold, and
- wherein the receiver electronic processor switches in the second capacitor when the on-channel signal level is above the on-channel threshold.
A method of scaling a dynamic range of an analog-to-digital converter, the method comprising:
- operating the analog-to-digital converter at a first dynamic range;
- receiving a radio frequency signal;
- detecting an on-channel signal level of the radio frequency signal;
- when the on-channel signal level is above an on-channel threshold, operating the analog-to-digital converter at a second dynamic range;
- and
- when the on-channel signal level is below the on-channel threshold, operating the analog-to-digital converter at the first dynamic range.
Dependencies are inferred from the claim text.