Amplifiers – Signal feedback – Phase shift means in loop path
Patent
1995-06-07
1997-08-26
Mottola, Steven
Amplifiers
Signal feedback
Phase shift means in loop path
330109, H03F 134
Patent
active
056614357
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.
REFERENCES:
patent: 3628129 (1971-12-01), Riley
patent: 4091333 (1978-05-01), Thrap
patent: 4152659 (1979-05-01), Gordon
patent: 4218613 (1980-08-01), Blerz
patent: 4275357 (1981-06-01), Nakayama et al.
patent: 4415803 (1983-11-01), Muoi
patent: 4429281 (1984-01-01), Ito et al.
patent: 4535233 (1985-08-01), Abraham
patent: 4543546 (1985-09-01), Hariharan
patent: 4558292 (1985-12-01), Sasaki et al.
patent: 4559502 (1985-12-01), Huijsing
patent: 4595884 (1986-06-01), Miller, Jr.
patent: 4623786 (1986-11-01), Rodwell
patent: 4626678 (1986-12-01), Morita et al.
patent: 4628303 (1986-12-01), Boyle
patent: 4761549 (1988-08-01), Mealer et al.
patent: 4827119 (1989-05-01), Gaboury
patent: 4868401 (1989-09-01), Erickson et al.
patent: 4879521 (1989-11-01), Bredemann et al.
patent: 4889985 (1989-12-01), Allsop et al.
patent: 5012202 (1991-04-01), Taylor
patent: 5023951 (1991-06-01), Kahn
patent: 5027081 (1991-06-01), Baum
patent: 5075633 (1991-12-01), Bowers
patent: 5117103 (1992-05-01), Flamm
patent: 5123732 (1992-06-01), Gross et al.
patent: 5155447 (1992-10-01), Huijsing et al.
patent: 5317277 (1994-05-01), Cavigelli
patent: 5486790 (1996-01-01), Huijsing et al.
patent: 5504456 (1996-04-01), Coleman
McGraw-Hill Encyclopedia of Electronics and Computers, 1984, pp. 28-30, pp. 340-341.
Mottola Steven
Murphy Joseph F.
PSC Inc.
LandOfFree
Low noise wide band amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low noise wide band amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low noise wide band amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1990970