Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1993-10-19
1995-02-14
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, H03F 345
Patent
active
053898931
ABSTRACT:
To improve the regulation (gain control) characteristics of a controllable amplifier, a negative feedback network in a differential amplifier is subdivided into individual networks supplied each with its own control current. In order to reduce distortion caused by non-linear sections contained in the networks or to increase intermodulation resistance, the individual control currents are reduced with an increasing input voltage. To obtain a dB-linear regulation characteristic the control currents may be proportioned, for example, in accordance with tangential-hyperbolic characteristic curves.
REFERENCES:
patent: H965 (1991-09-01), Davis et al.
patent: 4429416 (1984-01-01), Page
patent: 5313172 (1994-05-01), Vagher
Itri Sossio
Rieger Martin
Coalter Richard G.
Deutsche Thomson-Brandt GmbH
Emanuel Peter M.
Mottola Steven
Tripoli Joseph S.
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