Enhanced receiver equalization
View Patent ↗A receiver includes an analog-to-digital converter module configured to receive a test bit stream via a transmission channel and to provide a channel loss value of the transmission channel based on the test bit stream, a continuous time linear equalization module configured to receive a data bit stream via the transmission channel and to provide an equalized data bit stream based on an equalization setting, and a control module configured to set the equalization setting such that the CTLE module provides an equalization level to compensate for the channel loss value.
1. A receiver, comprising:
an analog-to-digital converter (ADC) module configured to receive a test bit stream via a transmission channel and to provide a channel loss value of the transmission channel based on the test bit stream;
a continuous time linear equalization (CTLE) module configured to:
receive a data bit stream via the transmission channel; and
provide an equalized data bit stream based on an equalization setting;
a control module configured to set the equalization setting such that the CTLE module provides an equalization level to compensate for the channel loss value;
wherein:
the ADC module is further configured to receive a second test bit stream via the transmission channel and to provide a second channel loss value of the transmission channel based on the second test bit stream; and
the control module is further configured to reset the equalization setting such that the CTLE module provides a second equalization level to compensate for the second channel loss value.
2. The receiver of claim 1 , further comprising:
an automatic gain control (AGC) module coupled to the CTLE module and configured to:
receive the equalized data bit stream; and
provide a boosted data bit stream based on a boost setting;
wherein the control module is further configured to:
determine that a maximum equalization level of the CTLE module is less than the channel loss value;
set the equalization setting such that the CTLE module provides the maximum equalization level; and
set a boost setting such that the AGC module provides a boost level to further compensate for the channel loss value.
3. The receiver of claim 2 , further comprising:
a channel management module configured to communicate with a transmitter, wherein the transmitter is configured to provide the test bit stream and the data bit stream;
wherein the control module is further configured to:
determine that a sum of the maximum equalization level and a maximum boost level of the AGC module is less than the channel loss value;
set the boost setting such that the AGC module provides the maximum boost level; and
direct, via the channel management module, the transmitter to set a de-emphasis setting of the transmitter such that the transmitter provides a de-emphasis level to further compensate for the channel loss value.
4. The receiver of claim 3 , further comprising:
a decision feedback equalization (DFE) module including a plurality of taps;
wherein the control module is further configured to:
determine that a sum of the maximum equalization level, a maximum boost level, and a maximum de-emphasis value of the transmitter is less than the channel loss value; and
set the DFE module to enable all of he plurality of taps.
5. The receiver of claim 1 , wherein receiving the test bit stream is in response to a channel training of the channel receiver.
6. The receiver of claim 1 , wherein the channel receiver comprises one of a PCI-Express channel, a Serial ATA channel, a Serial Attached SCSI channel, and a Fibre Channel channel.
7. A method comprising:
receiving, at an analog-to-digital converter (ADC) module of a receiver, a test bit stream via a transmission channel coupled to the receiver;
providing, by the ADC module, a channel loss value of the transmission channel based on the test bit stream;
receiving, by the receiver, a data bit stream vie the transmission channel;
setting, by a continuous time linear equalization (CTLE) module, an equalization setting such that the CTLE module provides an equalization level to the data bit stream to compensate for the channel loss value;
receiving, by an automatic gain control (AGC) module of the receiver and coupled to the CTLE module, the equalized data bit stream;
determining that a maximum equalization level of the CTLE module is less than the channel loss value;
setting the equalization setting such that the CTLE module provides the maximum equalization level; and
setting a boost setting such that the AGC module provides a boost level to further compensate for the channel loss value.
8. The method of claim 7 , further comprising:
determining that a sum of the maximum equalization level and a maximum boost level of the AGC module is less than the channel loss value;
setting the boost setting such that the AGC module provides the maximum boost level; and
directing, via a channel management module of the receiver, a transmitter coupled to the transmission channel to set a de-emphasis setting of the transmitter such that the transmitter provides a de-emphasis level to further compensate for the channel loss value.
9. The method of claim 8 , further comprising:
determining that a sum of the maximum equalization level, a maximum boost level, and a maximum de-emphasis value of the transmitter is less than the channel loss value; and
setting a decision feedback equalization (DFE) module including a plurality of taps to enable all of he plurality of taps.
10. The method of claim 9 , further comprising:
receiving, by the ADC module, a second test bit stream via the transmission channel;
providing a second channel loss value of the transmission channel based on the second test bit stream; and
resetting the equalization setting such that the CTLE module provides a second equalization level to compensate for the second channel loss value.
11. The method of claim 7 , wherein receiving the test bit stream is in response to a channel training of the channel receiver.
12. The method of claim 7 , wherein the channel receiver comprises one of a PCI-Express channel, a Serial ATA channel, a Serial Attached SCSI channel, and a Fibre Channel channel.
13. A non-transitory computer-readable medium including code for performing a method, the method comprising:
receiving, at an analog-to-digital converter (ADC) module of a receiver, a test bit stream via a transmission channel coupled to the receiver;
providing, by the ADC module, a channel loss value of the transmission channel based on the test bit stream;
receiving, by the receiver, a data bit stream vie the transmission channel;
setting, by a continuous time linear equalization (CTLE) module, an equalization setting such that the CTLE module provides an equalization level to the data bit stream to compensate for the channel loss value;
receiving, by an automatic gain control (AGC) module of the receiver and coupled to the CTLE module, the equalized data bit stream;
determining that a maximum equalization level of the CTLE module is less than the channel loss value;
setting the equalization setting such that the CTLE module provides the maximum equalization level; and
setting a boost setting such that the AGC module provides a boost level to further compensate for the channel loss value.
14. The computer-readable medium of claim 13 , the method further comprising:
determining that a sum of the maximum equalization level and a maximum boost level of the AGC module is less than the channel loss value;
setting the boost setting such that the AGC module provides the maximum boost level; and
directing, via a channel management module of the receiver, a transmitter coupled to the transmission channel to set a de-emphasis setting of the transmitter such that the transmitter provides a de-emphasis level to further compensate for the channel loss value.
15. The computer-readable medium of claim 14 , the method further comprising:
determining that a sum of the maximum equalization level, a maximum boost level, and a maximum de-emphasis value of the transmitter is less than the channel loss value; and
setting a decision feedback equalization (DFE) module including a plurality of taps to enable all of he plurality of taps.
16. The computer-readable medium of claim 15 , the method further comprising
receiving, by the ADC module, a second test bit stream via the transmission channel;
providing a second channel loss value of the transmission channel based on the second test bit stream; and
resetting the equalization setting such that the CTLE module provides a second equalization level to compensate for the second channel loss value.
17. The computer-readable medium of claim 13 , wherein receiving the test bit stream is in response to a channel training of the channel receiver.