Receiving circuit, clock recovery circuit, and communication system

摘要

High data-rate magnetic coupling communication is realized with a small circuit size without sacrificing the communication distance.;A received data acquisition circuit performs a decision-feedback equalization process on a received signal to obtain a shaped signal, and also performs sampling of the shaped signal with a sampling rate equal to or higher than a self-resonant frequency, according to a sampling clock, to obtain a data sample. A midpoint sample acquisition circuit performs sampling of the received signal at an intermediate timing of a sampling timing of the received data acquisition circuit to obtain a midpoint sample. A phase adjustment circuit adjusts a phase of the sampling clock, based on the data sample and the midpoint sample.

主权项

1. A receiving circuit which receives, via a transmission path formed by magnetic coupling of inductors at a transmission side and a receiving side, a signal corresponding to transmission data having a data rate equal to or higher than a self-resonant frequency of the inductors, the receiving circuit comprising:
a received data acquisition circuit which performs a decision-feedback equalization process on the received signal to obtain a shaped signal and, according to a sampling clock, performs sampling of the shaped signal with a same sampling rate as the data rate to obtain data samples; and a clock recovery circuit which corrects the sampling clock so that the received data acquisition circuit performs sampling at a correct sampling timing, wherein the clock recovery circuit includes: a midpoint sample acquisition circuit which performs sampling of the received signal at an intermediate timing of the sampling timing of the received data acquisition circuit to obtain a midpoint sample; and a phase adjustment circuit which adjusts a phase of the sampling clock, based on the data samples and the midpoint sample.