Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1994-02-09
1996-04-02
Mottola, Steven
Amplifiers
Signal feedback
Phase shift means in loop path
330109, 330 59, H03F 136
Patent
active
055044565
ABSTRACT:
An amplifier circuit provides wide bandwidth low noise performance by minimizing the effect of a pole created by the feedback resistor and the capacitance of the input device, such as a photodiode. This is accomplished by shifting the dominant pole to higher frequencies in the amplifier disclosed. A first amplifier stage receives a signal from an input device, such as the photodiode, and feedback from a second amplifier stage. The first amplifier stage is connected to the second amplifier stage such that a lower gain stage is employed to eliminate the phase shift which occurs if the amplifier alone is used in open loop form. The output of the low gain stage is provided to a second amplifier stage with associated gain setting components such that the dominant pole of the overall amplifier is shifted to a higher frequency, typically two decades higher than available from the single stage open loop amplifier. The noise performance of the amplifier is such that it is often unnecessary to apply a capacitor across a feedback resistor from the output of the amplifier to the signal source input, thus improving overall frequency performance.
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"Circuit Options Boost Photodiode Bandwidth"--EDN Electronic Design News! May 21, 1992 pp. 152-162, by Mr. Jerald Graeme of ME Burr-Brown Corp. in Tucson, AZ.
Mottola Steven
Murphy Joseph F.
PSC Inc.
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