Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Reexamination Certificate
2006-07-03
2010-10-26
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
C330S254000
Reexamination Certificate
active
07821342
ABSTRACT:
Devices (1,2) comprising feedback-less amplifiers (16,19,26,29) that are gain controlled introduce linear relationships between output signals and input signals of the feedback-less amplifiers (16,19,26,29) by providing the feedback-less amplifiers (16,19,26,29) sub-circuits in the form of first transistors (33) operated in their triode regions for receiving input signals and second sub-circuits in the form of second transistors (34) for receiving control signals and third sub-circuits in the form of resistors (35) for generating output signals, whereby the respective first and second and third sub-circuits form a serial path. Second circuits (4) receive gain signals and convert the gain signals into the control signals. The control signals are copies of the gain signals. The second circuits (4) comprise current sources (6) and third and fourth transistors (41,42). The current sources (6) comprise fifth and sixth transistors (61,62). The second circuits (4) further comprise voltage sources (9) further current sources. Third circuits (8) compensate common mode currents.
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Sanduleanu Mihai Adrian Tiberiu
Stikvoort Eduard F.
Nguyen Khiem D
Pascal Robert
ST-Ericsson SA
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