Amplifiers – Signal feedback – Variable impedance in feedback path varied by separate...
Reexamination Certificate
2008-04-01
2008-04-01
Pascal, Robert J. (Department: 2817)
Amplifiers
Signal feedback
Variable impedance in feedback path varied by separate...
C330S144000
Reexamination Certificate
active
11472138
ABSTRACT:
A dB-linear variable gain amplifier, a method for creation, and a system includes an amplifier; a pair of resistor arrays operatively connected to the amplifier, wherein each resistor array comprises MOS transistor resistive switches; a differential ramp-generator circuit operatively connected to the pair of resistor arrays; and voltage control lines generated by the differential ramp-generator circuit, wherein the voltage control lines are operatively connected to each of the MOS transistor resistive switches in the pair of resistor arrays. The number of the voltage control lines that are operatively connected to the each of the MOS transistor resistive switches is equal to the number of resistors in a particular resistor array. The differential ramp-generator circuit is preferably operable to take an automatic gain control voltage and generate a series of differential ramp voltages and apply the series of differential ramp voltages to one of the MOS transistor resistive switches.
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Harjani, R., “Low-Power CMOS VGA for 50 Mb/s Disk Drive Read Channels,” IEEE Trans. Circuits Syst. II, vol. 42, pp. 370-376, Jun. 1995.
Motamed, A., et al., “A Low-Voltage Low-Power Wide-Range CMOS Variable Gain Amplifier,” IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, vol. 45, No. 7, pp. 800-811, Jul. 1998.
Elwan Hassan
Fahim Amr
Ismail Aly
Youssoufian Edward
Gibb & Rahman, LLC
Newport Media, Inc.
Pascal Robert J.
Rahman, Esq. Mohammad S.
Wong Alan
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