Receiver equalizer circuitry with offset voltage compensation for use on integrated circuits
First Claim
1. Equalizer circuitry on an integrated circuit comprising:
- first, second, and third continuous time, linear, equalizer stages connected in series with one another in order from the first stage through the second stage to the third stage, each of the equalizer stages including peaking inductor circuitry; and
controllably variable, static, DC mode offset voltage compensation circuitry for controllably reducing DC voltage offset between an output signal of the third stage and utilization circuitry to which that output signal is applied;
wherein;
one of the equalizer stages includes a controllably variable current source; and
the static, DC mode offset voltage compensation circuitry controls current of the current source, the static, DC mode offset voltage compensation circuitry comprising memory circuitry for loading with values to control the current of the current source.
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Accused Products
Abstract
Equalizer circuitry on an integrated circuit (“IC”) includes first, second, and third continuous time, equalizer stages connected in series. Each stage includes peaking inductor circuitry. The equalizer circuitry may further include controllably variable, static, DC mode offset voltage compensation circuitry and/or dynamic, continuous mode, offset voltage compensation circuitry for respectively reducing DC voltage offset and/or time-varying, continuous mode voltage offset between an output of the third equalizer stage and utilization circuitry to which that output is applied. The first equalizer stage may be preceded by termination circuitry having controllably variable impedance. Differential circuitry and signalling may be used for various circuit components. The equalizer circuitry is particularly useful for fabrication as part of a programmable IC, using 28 nm CMOS technology, and as a receiver equalizer for a high-speed serial data signal having a bit rate of 20-25 Gbps.
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Citations
32 Claims
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1. Equalizer circuitry on an integrated circuit comprising:
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first, second, and third continuous time, linear, equalizer stages connected in series with one another in order from the first stage through the second stage to the third stage, each of the equalizer stages including peaking inductor circuitry; and controllably variable, static, DC mode offset voltage compensation circuitry for controllably reducing DC voltage offset between an output signal of the third stage and utilization circuitry to which that output signal is applied;
wherein;one of the equalizer stages includes a controllably variable current source; and the static, DC mode offset voltage compensation circuitry controls current of the current source, the static, DC mode offset voltage compensation circuitry comprising memory circuitry for loading with values to control the current of the current source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Equalizer circuitry on an integrated circuit comprising:
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first, second, and third continuous time, linear, equalizer stages connected in series with one another in order from the first stage through the second stage to the third stage, each of the equalizer stages including peaking inductor circuitry; and dynamic, continuous mode, offset voltage compensation circuitry for monitoring an output signal of the third stage and continuously reducing voltage offset between the output signal of the third stage and utilization circuitry to which that output signal is applied. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. Equalizer circuitry on an integrated circuit comprising:
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first, second, and third continuous time, linear, differential, equalizer stages connected in series with one another in order from the first stage through the second stage to the third stage, each of the equalizer stages including peaking inductors; and dynamic, continuous mode, differential, offset voltage compensation circuitry for monitoring differential output signals of the third stage and continuously reducing voltage offset between the differential output signals of the third stage and utilization circuitry to which those differential output signals are applied.
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Specification