Amplifiers – Combined with automatic amplifier disabling switch means
Reexamination Certificate
2000-11-13
2004-02-24
Choe, Henry (Department: 2817)
Amplifiers
Combined with automatic amplifier disabling switch means
C330S12400D, C330S134000
Reexamination Certificate
active
06696892
ABSTRACT:
FIELD OF THE INVENTION
The present invention in general encompasses the field of analog integrated circuit design, and in particular embodiments, analog circuit design of programmable gain amplifiers in low power supply environments.
BACKGROUND OF THE INVENTION
As integrated circuit voltages continue to decrease, relatively high input signals can turn on devices within circuits at times when they should not be turned on. There is therefore a need in the art for circuitry which is less sensitive to accidental turn on of components.
SUMMARY OF THE INVENTION
The invention discloses embodiments of programmable gain attenuators (PGAs). In an example PGA an input receives an input signal to be amplified. A plurality of impedances divide the signal into a plurality of voltage levels. A plurality of amplifiers receive the voltage levels. Only the selected amplifier is provided with power and the others are disconnected from power.
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Broadcom Corporation
Choe Henry
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