INTERGRATING RECEIVER HAVING ADAPTIVE FEEDBACK EQUALIZER FUNCTION TO SIMULTANEOUSLY REMOVE INTER-SYMBOL INTERFERENCE AND HIGH FREQUENCY NOISES AND SYSTEM HAVING THE SAME
First Claim
1. An integrating receiver comprising:
- a DFE (decision feedback equalizer); and
an integrator performing an integration on an output of the DFE during a period to provide the integrated output to the DFE,wherein an ISI (inter-symbol interference) of a waveform equalized by the DFE is removed by using data values decided before a period and before two periods.
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Accused Products
Abstract
Provided is an integrating receiver having an adaptive decision feedback equalizer function and a system having the same. The integrating receiver can simultaneously remove an inter-symbol interference (ISI) and high frequency noises in a high speed DRAM data transmission system. The integrating receiver reduces a probability of wrong decision of data in a state in which the ISI that exists in a channel is removed so as to increase a signal-to-noise ratio (SNR) of a receiver, so that a maximum operation speed increases even in an environment with heavy noises. There is also provided a method of obtaining an equalizer coefficient suitable for the integrating receiver and a method of obtaining a reference voltage by using an integrator in a single ended transmission method. In addition, in order to increase a decision feedback equalizer speed, a look-ahead method is used. In this method, flip flops with a high speed including multiplexers are used. Accordingly, the present invention can be applied to not only a DRAM interface system but also a serial communication between chips.
26 Citations
12 Claims
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1. An integrating receiver comprising:
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a DFE (decision feedback equalizer); and an integrator performing an integration on an output of the DFE during a period to provide the integrated output to the DFE, wherein an ISI (inter-symbol interference) of a waveform equalized by the DFE is removed by using data values decided before a period and before two periods. - View Dependent Claims (2, 3, 4)
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5. An integrating receiver system comprising:
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an integrating receiver integrating input signal during a period and removing an ISI of the input signal by using data values decided before a period and before two period; an error detector generating an error signal decided by energy difference between output signal from the integrating receiver; and an LMS controller obtaining an equalizer coefficient of the integrating receiver based on the error signal and the data values the integrating receiver. - View Dependent Claims (6, 7, 8, 9)
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10. A receiver comprising:
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DFEs having a look-ahead integration function; and flip-flops connected to the DFEs, respectively, wherein each of the DFEs having the integration function receives an input signal during a ¼
time of a data frequency and receives data values decided before a period and before two period, andwherein each of the DFEs comprises; a first DFE integrator that is operated when the data value decided before a period is 0; a second DFE integrator that is operated when the data value decided before a period is 1; and a comparator that selects one from outputs of the first and second DFE integrators according to the data value decided before a period. - View Dependent Claims (11, 12)
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Specification