Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-02-03
1993-02-16
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330253, H03F 345
Patent
active
051874482
ABSTRACT:
A differential amplifier (60,60') enhances common-mode stability by making two nodes (86,87) of a first stage low common-mode impedance nodes and thus shifting a common-mode dominant pole from the two nodes (86,87). The first stage includes an input portion (80,80') and a differential load (110,110'). The input portion (80,80') provides first and second currents respectively to the differential load (110,110') in response to a differential input voltage. The first and second currents have a differential component and a common-mode component. The differential load (110,110') converts the differential and common-mode components of the first and second currents into differential and common-mode voltages, respectively, and provides a high impedance to the differential component and a low impedance to the common-mode component.
REFERENCES:
patent: 4568885 (1986-02-01), McKenzie et al.
patent: 4573020 (1986-02-01), Whatley
patent: 5117199 (1992-05-01), Wang et al.
"Integrated PCM Codec," by Ohri, K. and Callahan, M., in IEEE Journal of Solid State Circuits, vol. SC-14, No. 1, Feb. 1979, pp. 38-46.
Brooks Todd L.
Rybicki Mathew A.
Jones Maurice (Jay)
Motorola Inc.
Mottola Steven
Polansky Paul J.
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