Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1995-07-31
1997-06-24
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330149, H03F 345, H03F 130
Patent
active
056420773
ABSTRACT:
An amplifier comprises an input transistor for receiving an input signal and a current source having a first and a second terminal, coupled to the input transistor at said first terminal and being adapted to be coupled to a direct current (DC) power supply at said second terminal. An active load is coupled to said input transistor, said active load being adapted to be biased by a biasing signal such that a noise signal at said second terminal is substantially attenuated at said first terminal. In accordance with another embodiment of the invention, in an amplifier, a method for providing a constant gain over a substantially wide frequency range, comprises the steps of receiving a differential input signal by a differential input stage of the amplifier so as to generate an output current signal in response to said input signal; transforming said output current signal to an output voltage signal; and substantially attenuating noise signals generated by a direct current (DC) power supply coupled to said amplifier in a manner so as to reduce the noise signal in said output voltage signal.
REFERENCES:
patent: 4710724 (1987-12-01), Connell et al.
patent: 5124666 (1992-06-01), Liu et al.
patent: 5198780 (1993-03-01), Kase
Lucent Technologies - Inc.
Mottola Steven
LandOfFree
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