Invention Grant
- Patent Title: Quarter-rate charge-steering decision feedback equalizer (DFE)
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Application No.: US16379502Application Date: 2019-04-09
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Publication No.: US10554453B1Publication Date: 2020-02-04
- Inventor: Mahdi Parvizi , Jacob Pike , Naim Ben-Hamida , Sadok Aouini , Calvin Plett
- Applicant: Mahdi Parvizi , Jacob Pike , Naim Ben-Hamida , Sadok Aouini , Calvin Plett
- Applicant Address: US MD Hanover
- Assignee: Ciena Corporation
- Current Assignee: Ciena Corporation
- Current Assignee Address: US MD Hanover
- Agency: Integral Intellectual Property Inc.
- Agent Miriam Paton; Amy Scouten
- Main IPC: H03H7/30
- IPC: H03H7/30 ; H03H7/40 ; H03K5/159 ; H04L25/03 ; H03K3/356

Abstract:
A decision feedback equalizer (DFE) comprises four charge-steering (CS) primary latches and four primary taps. Two of the four CS primary latches are driven by complementary in-phase quarter-rate clocks and the other two of the four CS primary latches are driven by complementary quadrature quarter-rate clocks. No element of the DFE is driven by any half-rate clocks. In some implementations, each of the primary latches including a respective differential pair of n-channel output transistors and each primary tap includes a respective differential pair of p-channel input transistors connected via their gate nodes to a respective one of the four CS primary latches. In other implementations, each of the primary latches including a respective differential pair of p-channel input transistors and each primary tap includes a respective differential pair of n-channel output transistors connected via their gate nodes to a respective one of the four CS primary latches.
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