Low-power, super-regenerative receiver targets 433-MHz ISM band

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10 Gb/s burst-mode post amplifier with automatic reset

A 10 Gbit/s burst-mode post-amplifier with automatic reset generation is presented. The reset signal is created by measuring the time since the last 1. This mechanism is suitable for high bit rate long-reach PONs where the guard time exceeds the maximum time of consecutive identical bits. The post-amplifier consists of four gain stages with automatic offset compensation and an output buffer. It obtains 40 dB gain with 7 GHz bandwidth and consumes 1.1 W from a 2.7 V supply

Burst-mode CDR performance in long-reach high-split passive optical networks

This paper compares two burst-mode clock and data recovery (BM-CDR) techniques suitable for bursty upstream data transmission, namely a gated voltage controlled oscillator (GVCO) and an oversampling clock phase alignment (CPA). Numeric models were deduced with timing jitter and duty cycle distortion (DCD) present in the received data. The performance of the two techniques are analyzed and compared especially in an optically amplified long-reach high-split PON (LR-PON) system. It is shown that an oversampling CPA exhibits a large DCD tolerance and better jitter rejection than a GVCO without line coding, resulting in high network efficiency while keeping fast bit synchronisation. This makes the oversampling CPA technique the best option for the proposed network

A 1024-QAM analog front-end for broadband powerline communication up to 60 MHz

A high performance analog front-end (AFE) for broadband powerline communication between 1.6 and 60 MHz is presented. The frequency division multiplexing AFE supports optimum channel selection, avoids disturbing RF signals and allows co-existence with other users of the spectrum. The direct-conversion receiver operates linearly up to a +18 dBm input level. Tunable low-pass filters, integrated into the receive path, support a wide class of service requirements by channel bandwidth selection. The dynamic range is 99.5 dB for 2 MHz channels, and 90.5 dB for 16 MHz channels. Error vector magnitude measurements are presented for a single-carrier 1024-QAM and a 1024-carrier 64-QAM signal as function or frequency and channel attenuation. For 1024-QAM, the error vector magnitude (EVM) is below or equal to 1.2% rms up to 60 dB of attenuation, whereas the 1024-carrier 64-QAM performs well up to 80 dB of attenuation. The presented chip was fabricated in a 0.25 mu m SiGe BiCMOS process, and the measured power consumption from a single 2.5 V supply is 668 mW

Burst-mode electronic equalization for 10-Gb/s passive optical networks using directly modulated lasers at the subscriber side

Using computer simulations, it is shown how burst-mode electronic equalization in the optical line termination of a passive optical network (PON) allows 10 Gb/s in the upstream direction with directly modulated distributed-feedback lasers. This allows achieving 10 Gb/s using cost-effective components at the optical network unit. Fast convergence of the equalizer coefficients is achieved during the preamble of each burst using the recursive least squares algorithm instead of the least mean squares algorithm. With a nine-tap feed-forward equalizer, two-tap decision feedback equalizer, a physical reach of 38 km and a splitting factor of 32 can be achieved in the 1.5-mu m window, exceeding requirements for deployed PONs

Evolution of burst mode receivers

The paper gives an overview of burst-mode receiver developments. The receiver design challenges associated with high speed TDMA PONs are discussed and recent results of 10 Gb/s burst-mode receivers are highlighted