Mahmoud Reza Ahmadi

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This paper presents an architecture and an optimization framework that uses partial response (PR) equalization for high-speed links. PR equalization is achieved through a combined use of linear transmit equalization and decision feedback equalization (DFE). This technique outperforms full-channel/impulse equalization for a wide range of channels in wireline(More)
A low-power, three-lane, pseudorandom bit sequence (PRBS) generator has been fabricated in a 0.18m CMOS process to test a multilane multi-Gb/s transmitter that cancels far-end crosstalk. Although the proposed PRBS generator was designed to produce three uncorrelated 12-Gb/s PRBS sequences, measurement results included in this paper have been obtained at(More)
We have proposed and verified an efficient architecture for a high-speed I/O transceiver design that implements far-end crosstalk (FEXT) cancellation. In this design, TX pre-emphasis, used traditionally to reduce ISI, is combined with FEXT cancellation at the transmitter to remove crosstalk-induced jitter and interference. The architecture has been verified(More)
This paper presents a pilot-based clock and data recovery CDR technique for high-speed serial link applications where a low-amplitude bitrate clock signal, i.e., a pilot, is added to the transmit signal. The clock tone is extracted at the receiver using an injection locked oscillator and is used to drive the receiver front-end samplers. The performance of(More)
An 8.0 GHz to 12.2 GHz PLL with a capacitor multiplier-based active loop filter is designed in a 28 nm digital CMOS process. A passive loop filter-based version of the PLL is also implemented for comparison. While the PLL area is comparable to that of digital PLLs, the PLL performance is as good as that of an analog PLL that employs a passive loop filter.(More)
This paper presents the design of a 12 Gbps multilane 2 − 1 pseudo-random binary sequence (PRBS) generator in 0.18 μm TSMC process. The design incorporates a traditional CMOS latch optimized to operate at frequencies close to the fT of the process. In order to operate at frequencies higher than the limit imposed by the fT of the PMOS devices, the PRBS uses(More)
This paper presents the design of a powerand area-efficient, high-performance dual-path receiver analog front-end (AFE) for wide multistandard applications of 8.5–11.5 Gb/s, such as 10GBASE-LRM, 10GBASE-KR, 10GBASE-CX1, and 10GBASE-LR/SR. A common programmable gain amplifier (PGA) with programmable peaking is followed by ADC-based and slicer-based paths.(More)