Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2007-09-04
2007-09-04
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
Reexamination Certificate
active
11160730
ABSTRACT:
An amplifier has a wide bandwidth and a high gain by using parallel loads. Each load has a load resistor and a load p-channel transistor in parallel. The drain voltages of differential n-channel transistors can be set by the load resistors, while switching current is provided by the load p-channel transistors. The parallel load provides a high impedance to the drain nodes yet still provides driving current. A transconductance stage with a pair of differential transistors and two parallel loads drives a shunt-shunt-feedback stage that has another pair of differential transistors and two more parallel loads. Shunt resistors between the gate and drain of the differential transistors in the shunt-shunt-feedback stage provide shunt feedback and low impedance. Several pairs of transconductance and shunt-shunt-feedback stages can be cascaded together. The cascaded amplifier may be used as a signal repeater.
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Liu Wing Faat
Zhang Michael Y.
Auvinen Stuart T.
g Patent LLC
Pascal Robert
Pericom Semiconductor Corp.
Wong Alan
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