Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-07-31
1999-06-29
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330292, H03F 345
Patent
active
059173793
ABSTRACT:
A compensation scheme for differential- or single-input transconductance amplifiers relies on an active feedback path with a resistive pole-splitting compensation circuit. The resistive compensation circuit causes pole-splitting of the two dominant poles, moving one pole to a slightly lower frequency and the other to a much higher frequency compared to the dominant poles of the uncompensated amplifier. A DC-blocking capacitor may also be placed in series with the resistor of the compensation circuit to allow for proper biasing of the circuit. By selecting appropriate values for the passive elements in the compensation circuit, the compensation scheme of the present invention can cause the amplifier to operate in a stable, linear manner over the same or even a larger bandwidth than an equivalent amplifier without compensation. The present invention does not suffer the problems of standard narrowbanding compensation schemes associated with high frequency cut-off.
REFERENCES:
patent: 3622903 (1971-11-01), Steckler
patent: 4157512 (1979-06-01), Schmoock
patent: 5068621 (1991-11-01), Hayward et al.
patent: 5307024 (1994-04-01), Metz et al.
patent: 5392000 (1995-02-01), Gillig
patent: 5465070 (1995-11-01), Koyama et al.
Ashby Kirk B
Davis Paul C.
Lucent Technologies - Inc.
Nguyen Khank Van
Pascal Robert
LandOfFree
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