Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-12-23
2000-01-25
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, 330253, H03F 345
Patent
active
060182695
ABSTRACT:
A method for producing gain in an electrical signal includes providing a variable resistance system having a plurality of transistors connected in parallel and controlling the resistance of the variable resistance system by applying a voltage to a control node of each of the plurality of transistors to selectively turn each transistor on or off. The method also includes receiving a differential input voltage and applying the differential input voltage across the variable resistance system to produce a signal current. The method also includes providing at least a portion of the signal current to a load resistance system to generate a differential output voltage and setting the ratio of the differential output voltage to the differential input voltage by controlling the voltage applied to the control node of each of the plurality of transistors.
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Rijns, J.J.F., "CMOS Low-Distortion High-Frequency Variable-Gain Amplifier," IEEE Journal of Solid-State Circuits, vol. 31, No. 7, pp. 1029-1034, Jul. 1996.
Brady III Wade James
Donaldson Richard L.
Nguyen Khanh Van
Pascal Robert
Swayze, Jr. W. Daniel
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