Duo-binary and/or binary data slicer
AssigneePlessey Semiconductors Limited
InventorPhilip H. Bird
Life of this patent
Estimating the term…
Abstract
A duo-binary and/or binary data slicer has a data input (10) coupled via a capacitor (C1) to a d.c. restoring circuit (A2 to Q6 and Q9 to Q13) d.c. reference level is superimposed on the data signal. A sample and hold circuit (C2, Q15 to Q22) is arranged to sample the data signal and provide a voltage related to the upper and lower peak value. A divider (R16-R19) is coupled between the d.c. reference level and the voltage related to the upper and lower peak value and provides intermediate output voltages (DU, DL, B) relating to duo-binary and/or binary level for determining the slicing levels.
Claims7
A duo-binary and/or binary data slicer, comprising:
- means for providing a d.c. reference voltage;
- a data signal input;
- means for coupling said data signal input via a capacitor to a d.c. restoring circuit, means for applying said d.c. reference voltage to said d.c. restoring circuit, said d.c. restoring circuit being arranged to superimpose a data signal received at said data signal input on said d.c. reference voltage;
- means for applying said superimposed data signal and reference voltage to a sample and hold circuit, said sample and hold circuit comprising at least one retention capacitor and means for establishing on one terminal of said retention capacitor a voltage related to a peak value of said superimposed data signal and reference voltage;
- divider means coupled with said means for providing a d.c. reference voltage and with said one terminal of said retention capacitor, said divider means being operative for providing intermediate output voltages for determining slicing levels;
- and, in respect of said at least one retention capacitor, a current mirror circuit operative for injecting into said retention capacitor an amount of current substantially equal to the current drawn therefrom by said divider means.
Dependencies are inferred from the claim text.