초록 ▼

Precompensated NRZ-encoded data for writing to magnetic storage medium operates with multiple NRZI-to-NRZ decoders that are each supplied with a selectably-variable version of a master clock. The delayed versions of the master clock are stably produced by delay elements operating with D-flip flops a

Precompensated NRZ-encoded data for writing to magnetic storage medium operates with multiple NRZI-to-NRZ decoders that are each supplied with a selectably-variable version of a master clock. The delayed versions of the master clock are stably produced by delay elements operating with D-flip flops and charge pumps in a delay-locked feedback loop. The direction of current supplied to or from a capacitor by the charge-pump during a cycle of delayed clock signal is controlled by the delayed clock signal for shaping the feedback signal to trigger appropriately the next cycle of the delayed clock signal. The duration of the selectable delay is adjusted by setting the amplitudes of the charge and discharge currents supplied by the charge-pump. Stable delayed versions of the master clock promote reliable conversions of NRZI data to write precompensated NRZ recordable data.

대표청구항 ▼

[ We claim:] [1.]1. A circuit for supplying a selected duration of delay with respect to transitions of a clock signal between first and second states thereof, the circuit comprising:a delay cell having inputs connected to receive the clock signal and a feedback signal for supplying an output signal

[ We claim:] [1.]1. A circuit for supplying a selected duration of delay with respect to transitions of a clock signal between first and second states thereof, the circuit comprising:a delay cell having inputs connected to receive the clock signal and a feedback signal for supplying an output signal having a third state that is selectively delayed in transition to a fourth state with respect to transitions of the clock signal from the first state to the second state in response to an applied feedback signal; anda control circuit connected to receive the third signal and a control signal for specifying the selected delay to supply a feedback signal to the delay cell for altering said selective delay in transition.