Amplifiers – Combined with automatic amplifier disabling switch means
Reexamination Certificate
2006-04-25
2006-04-25
Shingleton, Michael B. (Department: 2817)
Amplifiers
Combined with automatic amplifier disabling switch means
C330S285000, C330S298000, C330S129000, C330S288000
Reexamination Certificate
active
07034610
ABSTRACT:
An upstream amplifier is integrated on a substrate with a digital-to-analog converter (DAC) to form an integrated circuit. In an embodiment, a low-pass filter is also integrated on the substrate. The output signal level of the upstream amplifier is controllable. In embodiments, fine adjustments are made to the output signal level of the upstream amplifier by varying a bias current of the DAC. A software control bit is used to switch between a power-on mode of operation and a power-down mode of operation. The upstream amplifier transmits in a burst mode. The power consumption of the upstream amplifier scales with the amplifier's output signal level. A high degree of matching is attained between the positive and negative paths of the upstream amplifier. This provides high immunity from common-mode disturbances such as substrate noise, clock spurs, and glitches caused by a gain change.
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Burns Lawrence M.
Jantzi Stephen A.
McMullin Donald G.
Song Jungwoo
Tammineedi Anilkumar V.
Broadcom Corporation
Shingleton Michael B.
Sterne Kessler Goldstein & Fox PLLC
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