Invention Grant
- Patent Title: Finite impulse response analog receive filter with amplifier-based delay chain
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Application No.: US15453774Application Date: 2017-03-08
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Publication No.: US10313165B2Publication Date: 2019-06-04
- Inventor: Lawrence Chi Fung Cheng , Haihui Luo
- Applicant: Credo Technology Group Limited
- Applicant Address: KY Grand Cayman
- Assignee: Credo Technology Group Limited
- Current Assignee: Credo Technology Group Limited
- Current Assignee Address: KY Grand Cayman
- Agency: Ramey & Schwaller, LLP
- Agent Daniel J. Krueger
- Main IPC: H03F3/21
- IPC: H03F3/21 ; H03F3/193 ; H04L25/03 ; H04L27/01 ; H03F3/45 ; H03G5/28 ; H03H11/26 ; H03H15/02

Abstract:
High-data rate channel interface modules and equalization methods employing a finite impulse response (FIR) analog receive filter. Embodiments include an illustrative channel interface module having multiple amplifier-based delay units arranged in a sequential chain to convert an analog input signal into a set of increasingly-delayed analog signals that are weighted and combined together with the analog input signal to form an equalized signal; and a symbol decision element operating on the equalized signal to obtain a sequence of symbol decisions. An interface that extracts received data from the sequence of symbol decisions. The delay units may employ one or more delay cells each having a common-source amplifier stage followed by a source follower output stage, the two stages providing approximately equal portions of the propagation delay. An enhanced gate-to-drain capacitance in the common-source amplifier may increase propagation delay while reducing bandwidth limitations.
Public/Granted literature
- US20180262374A1 FINITE IMPULSE RESPONSE ANALOG RECEIVE FILTER WITH AMPLIFIER-BASED DELAY CHAIN Public/Granted day:2018-09-13
Information query
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