Semiconductor device including current-driven differential driver and method of controlling current-driven differential driver
AssigneeRicoh Company, Ltd.
InventorIsamu Moriwaki
Life of this patent
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Abstract
A semiconductor device includes a current-driven differential driver and a control circuit. The current-driven differential driver is configured to generate a pair of signals having levels relative to each other from a serial signal input therein and output a current from a current source included therein through an output node according to each of the signals. The control circuit controls the current-driven differential driver to pass the current from the current source as a throwaway current therein during a second predetermined time after an input of the serial signal stops and to block the throwaway current after the second predetermined time passes.
Claims11
A semiconductor device, comprising:
- a current-driven differential driver configured to generate a pair of signals having levels relative to each other from a serial signal input therein and to output a current generated by a current source included therein through an output node according to each of the signals;
- and
- a control circuit configured to control the current-driven differential driver,
- wherein the current-driven differential driver is controlled to pass the current as a throwaway current which is not for an operation therein during a second predetermined time after an input of the serial signal therein starts, then stops, and to block the throwaway current after the second predetermined time passes, and wherein the control circuit has a measuring part configured to measure the second predetermined time when the input of the serial signal stops and the current-driven differential driver is controlled to block the throwaway current when the measuring part outputs a signal indicating that the second predetermined time has passed.
A semiconductor device, comprising:
- a current-driven differential driver configured to generate a pair of signals having levels relative to each other from a serial signal input therein and to output a current generated by a current source included therein through an output node according to each of the signals;
- and
- a control circuit configured to control the current-driven differential driver,
- wherein the current-driven differential driver is controlled to pass the current as a throwaway current which is not for an operation therein during an externally settable second predetermined time after an input of the serial signal therein starts, then stops, and to block the throwaway current after the second predetermined time passes, wherein the control circuit further comprises a register in which the second predetermined time is set.
A method of controlling a current-driven differential driver configured to generate a pair of signals having conflicting levels from a serial signal input therein and output a current from a current source included therein through an output node according to each of the signals, the method comprising:
- passing the current from the current source as a throwaway current which is not for an operation therein during a second predetermined time after an input of the serial signal stops,
- determining that the second predetermined time has passed by measuring a period of time after the input of the serial signal stops;
- and
- blocking the throwaway current after determining that the second predetermined time has passed.
Dependencies are inferred from the claim text.