Analog to digital converter with increased sub-range resolution
View Patent ↗An analog to digital converter with increased sub-range resolution. The device includes an analog front end that produces an analog communication signal, a digital front end that receives a digital communication signal, and an Analog to Digital Converter (ADC) that samples the analog communication signal across a full-range. The ADC includes a full-range ADC having a first quantization accuracy configured to sample the analog communication signal across the full-range and a central sub-range ADC having a second quantization accuracy greater than the first quantization accuracy and configured to sample the analog communication signal across a central sub-range of the full-range. The ADC also includes signal combining circuitry configured to process outputs of the full-range ADC and the central sub-range ADC to create the digital communication signal.
1. A communication device comprising:
a processing module;
memory coupled to the processing module;
a communication interface coupled to the processing module, the communication interface comprising:
an analog front end configured to produce an analog communication signal;
a digital front end configured to receive a digital communication signal; and
an Analog to Digital Converter (ADC) configured to sample the analog communication signal across a full-range, the ADC comprising:
a full-range ADC having a first quantization accuracy configured to sample the analog communication signal across the full-range;
a central sub-range ADC having a second quantization accuracy greater than the first quantization accuracy and configured to sample the analog communication signal across a central sub-range of the full-range; and
signal combining circuitry configured to process outputs of the full-range ADC and the central sub-range ADC to create the digital communication signal.
2. The communication device of claim 1 , wherein the central sub-range corresponds to an expected range of the analog communication signal.
3. The communication device of claim 1 , wherein the central sub-range corresponds to approximately a middle quarter of the full-range.
4. The communication device of claim 1 , wherein the central sub-range ADC and the full-range ADC have a common bit size output.
5. The communication device of claim 1 , wherein the analog front end further comprises:
a Programmable Gain Amplifier (PGA) configure to be responsive to a gain input and to gain adjust the analog communication signal; and
gain control circuitry configured to produce the gain input so that the analog communication signal is within an expected range.
6. The communication device of claim 1 , wherein the communication interface is configured to service Powerline Communications.
7. The communication device of claim 1 , wherein the ADC further comprises range adjusting circuitry configured to select the central sub-range.
8. A method for operating a communication device comprising:
producing an analog communication signal by an analog front end;
sampling a full-range of the analog communication signal by a full-range ADC having a first quantization accuracy to produce a full-range ADC output;
sampling a central sub-range of the analog communication signal by a central sub-range ADC having a second quantization accuracy greater than the first quantization accuracy to produce a central sub-range ADC output; and
processing outputs of the full-range ADC output and the central sub-range ADC output to create a digital communication signal.
9. The method of claim 8 , wherein the central sub-range corresponds to an expected range of the analog communication signal.
10. The method of claim 8 , wherein the central sub-range corresponds to approximately a middle quarter of the full-range.
11. The method of claim 8 , wherein the central sub-range ADC output and the outer sub-range ADC output have a common bit size output.
12. The method of claim 8 , further comprising gain adjusting the analog communication signal in an attempt to cause the analog communication signal to be in the central sub-range.
13. The method of claim 8 , wherein the analog communication signal is a Powerline Communication signal.
14. The method of claim 8 , further comprising adjusting the central sub-range.
15. An Analog to Digital Converter (ADC) that samples an analog signal comprising:
a full-range ADC having a first quantization accuracy configured to sample the analog communication signal across a full-range;
a central sub-range ADC having a second quantization accuracy greater than the first quantization accuracy and configured to sample the analog communication signal across a central sub-range of the full-range; and
signal combining circuitry configured to process outputs of the full-range ADC and the central sub-range ADC to create a digital communication signal.
16. The ADC of claim 15 , wherein the central sub-range corresponds to an expected range of the analog signal.
17. The ADC of claim 15 , wherein the central sub-range corresponds to approximately a middle quarter of the full-range.
18. The ADC of claim 15 , wherein the central sub-range ADC and the full-range ADC have a common bit size output.
19. The ADC of claim 15 , wherein the ADC is configured to service Powerline Communications.
20. The ADC of claim 15 , further comprising range adjusting circuitry configured to select the central sub-range.