公开(公告)号：US09667454B1

公开(公告)日：2017-05-30

申请号：US15186791

申请日：2016-06-20

申请人： Hitachi, Ltd.

发明人： Hideki Koba ,  Keiki Watanabe ,  Fumio Yuki

IPC分类号： H04L25/03

CPC分类号： H04L25/03063

摘要： An adaptive equalizer includes: a speculative equalization circuit which operates a plurality of first tap coefficients with respect to input data and selects operation data corresponding to the input data from a plurality of operation data obtained by the operation; and an adaptive equalization circuit which generates the plurality of first tap coefficients, on the basis of the input data. The adaptive equalization circuit includes: an operation circuit which selects one of a plurality of second tap coefficients corresponding to the plurality of first tap coefficients and operates the selected second tap coefficient with respect to the input data; and a tap coefficient generation circuit which generates the plurality of first tap coefficients, on the basis of operation data obtained by the operation of the operation circuit, when the second tap coefficient selected at the time of the operation in the operation circuit corresponds to the first tap coefficient used for the operation of the operation data selected in the speculative equalization circuit.

公开(公告)号：US08963637B2

公开(公告)日：2015-02-24

申请号：US13901387

申请日：2013-05-23

申请人： Hitachi, Ltd.

发明人： Hideki Koba ,  Keiki Watanabe ,  Kouji Fukuda

IPC分类号： H03F3/45

CPC分类号： H03G3/004 ,  H03G1/0029

摘要： A semiconductor device capable of achieving high speed performance in addition to correction of differential offset and a communication device provided with the semiconductor device are provided. For example, there are provided: a variable gain type differential amplifier circuit VGA1 which receives a gain setting signal ASET, which amplifies differential input signals INP and INN by a gain indicated by the gain setting signal, and which outputs differential output signals OUTP′ and OTUN′; and an offset correcting circuit unit OFCBK1 which cancels an offset voltage (VOF and VOFO) generated in the VGA1. Here, the OFCBK1 cancels an output offset voltage VOFO (which results in an input offset voltage VOF) by receiving the ASET, generating a correction voltage changed in accordance with the gain, and adding the correction voltage to the OUTP′ and OUTN′.

摘要翻译： 提供了除了校正差分偏移之外还能够实现高速性能的半导体器件和设置有半导体器件的通信设备。 例如，提供：可变增益型差分放大电路VGA1，其接收增益设定信号ASET，该增益设定信号ASET以差分输入信号INP和INN放大由增益设定信号所表示的增益，并输出差分输出信号OUTP'和 OTUN' 以及抵消VGA1中产生的偏移电压（VOF和VOFO）的偏移校正电路单元OFCBK1。 这里，OFCBK1通过接收ASET来消除输出偏移电压VOFO（其产生输入偏移电压VOF），产生根据增益而改变的校正电压，并将校正电压加到OUTP'和OUTN'。