Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2005-05-17
2005-05-17
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S283000
Reexamination Certificate
active
06894563
ABSTRACT:
A technique for automatically controlling the gain of an amplifier by using a transistor as a voltage controlled variable degeneration resistor. The apparatus and method may be advantageously adapted for use in either voltage-to-current amplifiers or voltage-to-voltage amplifiers, single-ended or differential designs. One benefit of this technique is that, since the bias current is constant, the transistors operate in the correct region (i.e. the transistors are not biased out of the operating region). Additionally, the control mechanism is well-bounded.
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Loinaz, Marc J. and Wooley, Bruce A.,A CMOS Multichannel IC for Pulse Timing Measurements with 1-mV Sensitivity, IEEE Journal of Solid-State Circuits, vol. 30, No. 12, Dec. 1995.
Atheros Communications Inc.
Carpenter John W.
Nguyen Patricia
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