Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-03-28
2006-03-28
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000
Reexamination Certificate
active
07019590
ABSTRACT:
A circuit for providing a self-stabilizing, differential load circuit with well controlled impedance to an amplifier is described. According to one embodiment, two pairs of transistors in a cross-coupled configuration and a degeneration resistor for each transistor provide the self-stabilizing, differential load. Small signal analysis of the circuit illustrates an impedance of the load circuit to be substantially equal to a combination of resistor values with substantially little dependence on transconductances and incremental resistances of the transistors. By employing well matched resistors, impedance of the load to the amplifier may be well controlled, and common mode feedback loops avoided, because a current source is not employed as a load. Furthermore, due to use of transistors, a low voltage headroom may be increased and an integrated circuit area decreased.
REFERENCES:
patent: 5764086 (1998-06-01), Nagamatsu et al.
patent: 5854574 (1998-12-01), Singer et al.
patent: 5994939 (1999-11-01), Johnson et al.
patent: 6476656 (2002-11-01), Dally et al.
patent: 6650182 (2003-11-01), Kim et al.
Branch John W.
Darby & Darby PC
National Semiconductor Corporation
Nguyen Patricia
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