Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-10-16
1999-07-20
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
327359, H03F 345
Patent
active
059260688
ABSTRACT:
A variable gain amplifier has a plurality of amplifying stages. Each amplifying stage has a pair of cascode transistors that provide a low impedance path to signal currents when operating in the signal transmission mode and a high impedance to unwanted feedforward current when operating in a blocking mode. In a preferred embodiment, a pair of cascode transistors can also be shared among a plurality of amplifying stages of the variable gain amplifier. Further, when different pairs of input signals are provided to different amplifying stages, the circuit can be used as an analog multiplexer.
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Kabushiki Kaisha Toshiba
Nguyen Patricia
Pascal Robert
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