Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-11-24
2000-01-18
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330292, 330300, H03F 345, H03F 114, H03F 316
Patent
active
060160772
ABSTRACT:
A method is disclosed for modifying the operational bandwidth of a signal amplification circuit, comprising the steps of providing an amplification circuit for amplifying the electrical signal, providing circuitry to selectably modify capacitive loading within the amplification circuit and coupled to the amplification circuit, and using the circuitry to selectively modify capacitive loading to alter a dominant pole of the amplification circuit, resulting in a modification of the operational bandwidth of the amplification circuit. A user switchable circuit 220 is coupled to an amplification portion (202, 204, 206, 208, 210, 216, 218) of the amplification circuitry such that a user may selectively activate or deactivate the switchable circuitry, effecting a corresponding and balanced increase or decrease of the capacitive loading within the amplification circuitry. The balanced nature of the capacitive loading changes, effected by the user switchable circuitry, provides the advantage of minimizing the effects of common mode noise and instability in the amplifier circuitry.
REFERENCES:
patent: 5227681 (1993-07-01), Koyama et al.
patent: 5293169 (1994-03-01), Baumgartner et al.
patent: 5578962 (1996-11-01), Rastegar
Mayfield Glenn C.
Ranmuthu Indumini W.
Brady III Wade James
Donaldson Richard L.
Nguyen Patricia T.
Pascal Robert
Swayze, Jr. W. Daniel
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