Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Reexamination Certificate
2006-07-04
2006-07-04
Shingleton, Michael B. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
C330S310000, C330S098000, C330S151000, C330S152000, C327S560000, C327S574000
Reexamination Certificate
active
07071784
ABSTRACT:
Variable gain amplifiers offering high frequency response with improved linearity and reduced power dissipation are provided. An amplifier is disclosed that is constructed from a one-stage topology with multiple signal paths and compensation networks for improved linearity and stable operation. In this amplifier, improved performance is obtained by replacing single transistor components with enhanced active devices which incorporate local negative feedback. One embodiment of the invention is a transconductance enhancement circuit that improves transconductance and input impedance relative to the prior art. A further development is an enhanced active cascode circuit that provides improved linearity. A high frequency bipolar transistor switch is also disclosed that incorporates lateral PNP transistors as high frequency switches with improved OFF-state to ON-state impedance ratio to realize a variable gain function. These circuits are combined in an amplifier circuit that provides variable gain and high frequency performance, with improved linearity, gain, and input impedance.
REFERENCES:
patent: 4728905 (1988-03-01), Zhiwei
patent: 6278328 (2001-08-01), Yamamoto
Sedra et al. “Microelectronic Circuits” 5thedition Oxford University Press 2004 pp 801-807 and 864-865.
Sedra, Adel S. et al., “Microelectronic Circuits”, p. 744, Oxford University Press, New York, 1998.
Fish & Neave IP Group of Ropes & Gray LLP
Linear Technology Corporation
Morris Robert W.
Mullen Jeffrey D.
Shingleton Michael B.
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