Amplifiers – With amplifier bypass means
Patent
1997-07-10
1999-05-11
Pascal, Robert
Amplifiers
With amplifier bypass means
330311, H03F1/00;3/68
Patent
active
059031905
ABSTRACT:
Embodiments of the invention include an amplifier having an enhanced feedforward arrangement. In a typical operational amplifier output stage of this type, conventional feedforward arrangements comprise one or more active electrical components coupled between the second stage amplifying transistor and the negative output driver. The enhanced feedforward arrangement includes a resistor connected between the second stage amplifying transistor and the negative voltage source and a second resistor connected between the second stage amplifying transistor and the negative output driver. Alternatively, a capacitor is connected in parallel with the second resistor. In this manner, feedforward arrangements according to embodiments of the invention advantageously provide stable, enhanced frequency response, including high frequency response, e.g., above approximately 10 kHz, using economically advantageous passive rather than active electrical components. Furthermore, feedforward arrangements according to embodiments of the invention typically require less components than conventional feedforward arrangements, making them further advantageous from an economic standpoint.
REFERENCES:
patent: 4173741 (1979-11-01), Kameny
Robert Widlar and Mineo Yamatake, Session XI: Operational Amplifiers And Voltage Regulators, 1985 IEEE International Solid-State Circuits Conference, pp. 140-141, 325.
Embree Milton Luther
Lee Robert Frederick
Harman John M.
Lucent Technologies - Inc.
Nguyen Patricia T.
Pascal Robert
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