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US 8,283,982 B2Granted
Decision feedback equalizer circuit
AssigneeBroadcom Corporation
InventorsDavid Kyong-Sik Chung, Afshin Momtaz
Life of this patent
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Abstract
An equalization circuit adjusts (e.g., equalizes) an input signal according to the value of one or more adjustment signals (e.g., equalization coefficients) without a multiplication operation. For example, the circuit may add or subtract a value of a coefficient signal to the amplitude of an input signal. Here, whether the coefficient is added or subtracted may depend on the sign of a control signal.
Claims17
A current mode summer circuit comprising:
- a first differential transistor pair configured to provide a differential current signal at a first node and a second node in accordance with a differential input signal;
- at least one programmable current source configured to provide at least one current signal in accordance with the product of at least one equalization coefficient signal and a transconductance associated with the first differential transistor pair;
- and
- at least one switch configured to combine the at least one current signal and the differential current signal in accordance with at least one control signal.
1 more element
A method comprising:
- providing a differential current signal at a first node and a second node in accordance with a differential input signal;
- providing at least one current signal in accordance with the product of at least one equalization coefficient signal and a transconductance associated with the differential current signal;
- and
- combining the at least one current signal and the differential current signal in accordance with at least one control signal.
1 more element
Dependencies are inferred from the claim text.