Amplifiers – With semiconductor amplifying device – Including plural stages cascaded
Reexamination Certificate
2005-03-01
2005-03-01
Nguyen, Khanh V. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural stages cascaded
C330S098000
Reexamination Certificate
active
06861908
ABSTRACT:
There is disclosed an improved 2-stage large bandwidth amplifier (20) comprised of two stages formed by first and second bipolar transistors (Q1,Q2) configured in common emitter that are connected in series with their emitters connected to a first supply voltage (Gnd). The input signal (Vin) is applied to the base of said first transistor via an input terminal (11), while the output signal (Vout) is available at an output terminal (12) connected to the collector of said second transistor. A parallel feedback structure (13′) is provided. It consists, in a first branch, of two diodes (D1,D2) in series connected between a second supply voltage (Vcc) and the collector of the second bipolar transistor, and in another branch of a third bipolar transistor (Q3) configured in emitter follower with a resistor (Rf) in the emitter. The base and the collector of said third bipolar transistor are respectively connected to the common node of said diodes and to said second supply voltage. The resistor is connected to the common node of said first and second transistors to inject the feedback signal (Vf). Because, the two bodies have a low internal resistance and reduce the collector capacitance of the second transistor, the overall bandwidth of the improved amplifier is significantly extended in the very high frequencies (e.g. 20 GHz and above).
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“Tunable Linearity Characteristics of a DC-3 GHz InP HBT Active Feedback Amplifier”, Kobayashi, et al., IEEE Oct. 1999, pp. 291-294.
High-Bit-rate, High-Input-Sensitivity Decision Circuit Using Si Bipolar Technology by K.Ishii et al, IEEE Journal of Solid-State Circuits, vol. 29, No. 5, May 1994, pp. 546-549.
Gabillard Bertrand
Girard Philippe
Rivier Michel
Voisin Fabrice
International Business Machines - Corporation
Nguyen Khanh V.
Ulrich Lisa J.
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