Electrical level output device for guaranting maximum voltage headroom and its method
A technology with the largest margin, applied in measuring devices, adjusting electrical variables, data processing power supplies, etc., can solve the problem of inflexible reference voltage adjustment, achieve large voltage margin, solve inter-symbol interference, and change flexibly.
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Embodiment 1
[0070] In this embodiment, a level output device that ensures the maximum voltage margin is proposed, such as Figure 5 , Image 6 As shown, it includes a signal input module, a reference voltage output module and a threshold level judgment module, where:
[0071] The signal input module is configured to transmit input signals to the reference voltage output module and the threshold level judgment module;
[0072] The reference voltage output module is configured to output a reference voltage to the threshold level judgment module, and adjust the output value of the next reference voltage according to the current input signal of the signal input module;
[0073] The threshold level judging module is used to determine the current output signal according to the current input signal and the current reference voltage.
[0074] The reference voltage output module described in this embodiment is an FIR filter, and the reference Image 6 As shown, the filter includes at least:
...
Embodiment 2
[0087] The principle of this embodiment is the same as that of Embodiment 1, such as Figure 7 As shown, the difference is that this embodiment also includes a coefficient adaptive adjustment module, configured to receive the input signal currently transmitted by the signal input module, the reference voltage currently output by the reference voltage output module, and the threshold level judgment module current output signals, and adjust the coefficients in the coefficient set of the filter according to the three signals.
[0088] In this embodiment, the coefficient adaptive adjustment module includes:
[0089] A sum and difference circuit, configured to obtain an error signal according to the current input signal, the current reference voltage and the current output signal;
[0090] a coefficient calculation unit, configured to calculate and obtain the filter coefficients according to the error signal obtained by the sum and difference circuit;
[0091] A coefficient updat...
Embodiment 3
[0129] refer to Figure 5 as well as Figure 12 As shown, the principle of this embodiment is the same as that of Embodiment 1, the difference is that the reference voltage output module in this embodiment is an IIR filter, and the filter at least includes:
[0130] The first differential circuit is used to obtain the difference between the current input signal and the current output reference voltage;
[0131] a shift register group, used to store the difference generated by the first difference making circuit;
[0132] a coefficient group for storing coefficients required for outputting the reference voltage;
[0133] a multiplier for multiplying the difference stored in the set of shift registers with the coefficients in the set of coefficients;
[0134] The adder is used for summing the multiplication results obtained by the multiplier, and outputting the next reference voltage.
[0135] When applying the device described in this embodiment, refer to Figure 12 , when...
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Abstract
Description
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Application Information
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