PAM4 PAM4 RECEIVER INCLUDING ADAPTIVE CONTINUOUS-TIME LINEAR EQUALIZER

摘要

The present invention relates to a PAM4 receiver comprising a continuous-time linear equalizer capable of adaptively tuning using a training data pattern. A PAM4 receiver according to the present invention includes: (i) a first training data pattern including data “00” and successive first data “11” to m-th data “11”; and (ii) a second training data pattern including at least one of data “01” and data “10”; a linear equalizer outputting an output signal CTLE_out including corresponding data levels dlev 0 , dlev 1 , dlev 2 , dlev 3 ; (i) the level of the output signal CTLE_out corresponding to the first data “11” and a predetermined voltage level when the data “00” of the first training data pattern is transitioned to the first data “11” difference in upper limit (dlev 3H ) (dlev 3HD ); (ii) a difference dlev 3LD between the level of the output signal CTLE_out corresponding to any one of the second data “11” to the m-th data “11” and a predetermined voltage level lower limit dlev 3L ; and (iii) the difference (dlev 1D ) between the level of the output signal CTLE_out corresponding to the data “01” of the second training data pattern and the data level dlev 1 or the output corresponding to the data “10” a sampler for sampling and outputting a difference (dlev 2D ) between the level of the signal (CTLE_out) and the data level (dlev 2 ); a DEMUX parallelizing the output signal of the sampler and outputting it as an output signal DATA_out; a CDR for providing a clock signal for sampling to the sampler and the DEMUX; and a signal (EQ_AC[N AC -1:0]) for adjusting the high-frequency amplification gain of the linear equalizer according to the difference (dlev 3HD ) included in the output signal (DATA_out). and a signal (EQ_DC[N DC -1:0]) for adjusting the low-frequency amplification gain of the linear equalizer according to the difference (dlev 3LD ) is provided to the linear equalizer to adapt the high-frequency amplification gain and the low-frequency amplification gain data level (dlev 1 ) or data level (dlev 2 ) determined according to the difference (dlev 1D ) or difference (dlev 2D ); the voltage level upper limit (dlev 3H ) and the voltage level lower limit (dlev 3L ); and a control unit providing the sampler threshold voltages (V TH01 , V TH12 , V TH23 ) calculated from the data levels (dlev 0 , dlev 1 , dlev 2 , dlev 3 ) to the sampler ( m is a natural number greater than or equal to 2).