Emphasis circuit and transmitter
AssigneeFujitsu Limited
InventorYukito Tsunoda
Life of this patent
Estimating the term…
Abstract
An emphasis circuit includes: an applying circuit to add an emphasis signal to an input differential signal; a feedback path to feed back a differential output of the applying unit; a comparing circuit to compare a direct current component level of a positive phase signal and of a negative phase signal of the differential signal; a direct current component level controlling circuit to control a direct current component level of at least one of the positive phase signal and the negative phase signal; a delay unit circuit to add a delay to at least one of the fed-backed differential signal to generate the emphasis signal and inputs the emphasis signal into the applying unit; and a dummy load coupled to a positive phase signal output or a negative phase signal output of the applying unit.
Claims14
An emphasis circuit comprising:
- an applying circuit to add an emphasis signal to an input differential signal;
- a feedback path to feed back a differential output of the applying unit;
- a comparing circuit to compare a direct current component level of a positive phase signal and of a negative phase signal of the differential signal;
- a direct current component level controlling circuit to control a direct current component level of at least one of the positive phase signal and the negative phase signal;
- a delay unit circuit to add a delay to at least one of the fed-backed differential signal to generate the emphasis signal and inputs the emphasis signal into the applying unit;
- and
- a dummy load coupled to a positive phase signal output or a negative phase signal output of the applying unit.
A transmitter comprising:
- a pre-emphasis driver to include an emphasis circuit that conducts pre-emphasis and a driver;
- and
- a load coupled to an output of the pre-emphasis driver;
- wherein,
- the pre-emphasis driver includes:
- an applying circuit to add an emphasis signal to an input differential signal;
- a feedback path to feed back a differential output of the applying unit;
- a comparing circuit to compare a direct current component level of a positive phase signal and of a negative phase signal of the differential signal;
- a direct current component level controlling circuit to control a direct current component level of at least one of the positive phase signal and the negative phase signal;
- a delay unit circuit to add a delay to at least one of the fed-backed differential signal to generate the emphasis signal and inputs the emphasis signal into the applying unit;
- and
- a dummy load coupled to a positive phase signal output or a negative phase signal output of the applying unit.
Dependencies are inferred from the claim text.