Publication
Electronics Letters
Paper

BBPD with wide input phase range

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Abstract

Wireline communication circuits often include serialisers/deserialisers using multiphase signals for multiplexing or sampling. From a power efficiency viewpoint, configurations are desired in which a single differential clock at frequency f is distributed to decentralised multiphase generators as opposed to distribution at 2f with local frequency dividers. A bang-bang phase detector (BBPD) is presented for such a multiphase generator operated from 4 to 16 GHz. Owing to the 2-octave frequency range, a wide input phase range is required for which the BBPD may not generate false locks. This is achieved by an implementation in which down pulses at the output of a fully symmetrical set/reset latch are stretched via pulse-width extension circuitries. A sampling pulse generated from one of the input phases can then easily capture the extended down pulses across a wide input phase range to unambiguously indicate phase leading or phase lagging to the control logic of the multiphase generator. The proposed circuitry has been implemented in a 7 nm CMOS technology. A comparison to alternative BBPD approaches implemented in the same technology shows that the proposed architecture outperforms them in terms of achievable input phase range.

Date

07 Mar 2019

Publication

Electronics Letters

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