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US 6,472,940 B1Granted
Gigabit ethernet transceiver with analog front end
AssigneeBroadcom Corporation
InventorsArya R. Behzad, Klaas Bult, Ramon A. Gomez, Chi-Hung Lin, Tom W. Kwan, Oscar E. Agazzi, John L. Creigh, Mehdi Hatamian, David E. Kruse, Arthur Abnous, Henry Samueli
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Abstract
Circuitry to remove switches from signal paths in integrated circuit programmable gain attenuators. Programmable gain attenuators and programmable gain amplifiers commonly switch between signal levels using semi-conductors switches. Such switches may introduce non-linearities in the signal. By isolating the switches from the signal path linearity of the PGA can be improved.
Claims4
A method for providing a control signal for a programmable gain attenuator (PGA), the method comprising:
- setting a value for a fine control portion of a programmable gain attenuator;
- operating a coarse AGC portion of a control loop that compares an average absolute value of the signal controlled to a reference value;
- terminating the operation of the coarse AGC portion of the control loop;
- and
- operating the fine control portion of the programmable attenuator.
2 more elements
Dependencies are inferred from the claim text.