Digital signal processing based de-serializer

• US 8,229,033 B2
• Filed: 09/22/2011
• Issued: 07/24/2012
• Est. Priority Date: 03/01/2001
• Status: Expired due to Term

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Agazzi, Oscar E.
• Primary Examiner(s): Bocure, Tesfaldet
• Application Number:
  US13/239,677
• Publication Number:
  US 20120007756A1
• Time in Patent Office: 306 Days
• Field of Search: 375/316, 375/355, 375/345, 375/350, 375/354, 375229-232, 455/234.2, 455/234.1, 455/232.1, 327/50, 327/58, 327/59, 327/60
• US Class Current: 375/316
• CPC Class Codes: H03M 1/0624 by synchronisation
• CPC Class Codes: H03M 1/0836 of phase error, e.g. jitter
• CPC Class Codes: H03M 1/0863 of switching transients, e.g. glitches
• CPC Class Codes: H03M 1/1215 using time-division multiplexing
• CPC Class Codes: H04B 10/69 Electrical arrangements in the receiver
• CPC Class Codes: H04L 2025/03445 Time domain
• CPC Class Codes: H04L 25/03057 with a recursive structure H04L25/03031 takes precedence
• CPC Class Codes: H04L 25/03159 operating in the frequency domain H04L25/03165, H04L25/03178 take precedence
• CPC Class Codes: H04L 7/0062 detection of error based on data decision error, e.g. Mueller type detection

Abstract

A DSP based SERDES performs compensation operations to support high speed de-serialization. A receiver section of the DSP based SERDES includes one or more ADCs and DSPs. The ADC operates to sample (modulated) analog serial data and to produce digitized serial data (digital representation of the modulated analog serial data). The DSP communicatively couples to the ADC and receives the digitized serial data. Based upon the known characteristics of the digitized serial data and the digitized serial data itself, the DSP determines compensation operations to be performed upon the serial data to compensate for inadequacies of the receiver and/or channel response. These compensation operations may be (1) performed on the analog serial data before digitization by the ADC; (2) applied to the ADC to modify the operation of the ADC; and/or (3) performed on the digitized serial data by the DSP or another device.

Claims

1. An apparatus, comprising:

a compensation circuitry for processing an analog signal thereby generating a processed analog signal;

an analog to digital converter (ADC) for sampling the processed analog signal thereby generating a plurality of digital samples; and

a digital signal processor (DSP) for;

processing the at least some of the plurality of digital samples in accordance with generating and providing at least one of a first control signal to the compensation circuitry and a second control signal to the ADC; and

performing at least one compensation operation on the plurality of digital samples thereby generating a compensated plurality of digital samples; and

wherein;

operation of the compensation circuitry adaptive based on the first control signal;

operation of the ADC adaptive based on the second control signal; and

at least one of the first control signal and the second control signal based on at least some of the plurality of digital samples.

2. The apparatus of claim 1, wherein:

the DSP being directly coupled to the compensation circuitry and the ADC;

the DSP implemented for providing the first control signal to the compensation circuitry via a first direct coupling thereto; and

the DSP implemented for providing the second control signal to the ADC via a second direct coupling thereto.

3. The apparatus of claim 1, further comprising:

a decoder for decoding the plurality of compensated plurality of digital samples.

4. The apparatus of claim 1, wherein:

the apparatus being a serializer/de-serializer for interfacing a first communication device and a second communication device.

5. An apparatus, comprising:

a compensation circuitry for processing an analog signal thereby generating a processed analog signal; and

an analog to digital converter (ADC) for sampling the processed analog signal thereby generating a plurality of digital samples; and

wherein;

operation of the compensation circuitry adaptive based on a first control signal;

operation of the ADC adaptive based on a second control signal; and

at least one of the first control signal and the second control signal based on at least some of the plurality of digital samples.

6. The apparatus of claim 5, further comprising:

a digital signal processor (DSP) for processing the at least some of the plurality of digital samples in accordance with generating and providing at least one of the first control signal to the compensation circuitry and the second control signal to the ADC.

7. The apparatus of claim 6, wherein:

the DSP being directly coupled to the compensation circuitry and the ADC;

the DSP implemented for providing the first control signal to the compensation circuitry via a first direct coupling thereto; and

the DSP implemented for providing the second control signal to the ADC via a second direct coupling thereto.

8. The apparatus of claim 5, further comprising:

a digital signal processor (DSP) for performing at least one compensation operation on the plurality of digital samples thereby generating a compensated plurality of digital samples.

9. The apparatus of claim 8, further comprising:

a decoder for decoding the plurality of compensated plurality of digital samples.

10. The apparatus of claim 8, wherein:

the DSP for identifying the at least one compensation operation based on the at least some of the plurality of digital samples.

11. The apparatus of claim 5, further comprising:

a decoder for decoding the plurality of digital samples.

12. The apparatus of claim 5, wherein:

the ADC being a first ADC; and

further comprising;

a plurality of ADCs, including the first ADC, for sampling the processed analog signal thereby generating the plurality of digital samples arranged as parallel digital data; and

wherein;

operation of the first ADC adaptive based on the second control signal; and

operation of a second ADC of the plurality of ADCs adaptive based on a third control signal.

13. The apparatus of claim 12, further comprising:

a digital signal processor (DSP) for processing the at least some of the plurality of digital samples in accordance with generating and providing the second control signal to the first ADC and the third control signal to the second ADC.

14. The apparatus of claim 5, wherein:

the apparatus being a serializer/de-serializer for interfacing a first communication device and a second communication device.

15. A method, comprising:

operating a compensation circuitry for processing an analog signal thereby generating a processed analog signal; and

operating an analog to digital converter (ADC) for sampling the processed analog signal thereby generating a plurality of digital samples;

adapting operation of the compensation circuitry based on a first control signal; and

adapting operation of the ADC adaptive based on a second control signal, wherein at least one of the first control signal and the second control signal based on at least some of the plurality of digital samples.

16. The method of claim 15, further comprising:

operating a digital signal processor (DSP) for processing the at least some of the plurality of digital samples in accordance with generating and providing at least one of the first control signal to the compensation circuitry and the second control signal to the ADC.

17. The method of claim 15, further comprising:

operating a digital signal processor (DSP) for performing at least one compensation operation on the plurality of digital samples thereby generating a compensated plurality of digital samples.

18. The method of claim 15, further comprising:

operating a decoder for decoding the plurality of compensated plurality of digital samples.

19. The method of claim 15, wherein:

the ADC being a first ADC; and

further comprising;

operating a plurality of ADCs, including the first ADC, for sampling the processed analog signal thereby generating the plurality of digital samples arranged as parallel digital data;

adaptively operating the first ADC based on the second control signal;

adaptively operating a second ADC of the plurality of ADCs based on a third control signal; and

operating a digital signal processor (DSP) for processing the at least some of the plurality of digital samples in accordance with generating and providing the second control signal to the first ADC and the third control signal to the second ADC.

20. The method of claim 15, wherein:

the method performed within a serializer/de-serializer for interfacing a first communication device and a second communication device.