Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1993-01-29
1996-01-23
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330 84, 330145, 330284, H03G 330
Patent
active
054867916
ABSTRACT:
A programmable gain amplifier including first and second gain elements are connected by an impedance selector which allows programmability of the gain of both gain elements. The impedance selector is connected in series with the output of the first gain element. The impedance selector places an impedance in the feedback path of the first gain element or the input path of the second gain element. Errors introduced in the signal path due to the switches are attenuated by the open loop gain of the first gain element. The gain may be equally divided between both stages of the amplifier to allow for optimum band width. Optimum noise performance may be obtained by placing most of the gain in the first stage. An instrumentation amplifier may also be made which further includes a third gain element connected to the gain element with a second impedance selector in a manner similar to the connection of the first gain element to the second gain element.
REFERENCES:
patent: 3355670 (1967-11-01), Pastoriza
patent: 3579138 (1971-05-01), Harris et al.
patent: 4091333 (1978-05-01), Thrap
patent: 4132957 (1979-01-01), Hekimian et al.
patent: 4354159 (1982-10-01), Schorr et al.
patent: 4396890 (1983-08-01), Kato et al.
patent: 4473802 (1984-09-01), Min et al.
patent: 4523155 (1985-06-01), Walczak et al.
patent: 4599574 (1986-07-01), Chambers
patent: 4628276 (1986-12-01), Mizutani
patent: 4918397 (1990-04-01), Kidger
Analog Devices Product Data Sheet for AD75062 and AD75068, Rev. 0 (Norwood, Mass.: Analog Devices, 1991).
Analog Devices, "Linear Databook", pp. 4-7, 4-11, 4-37, 4-43. (Norwood, Mass.: Analog Devices, 1990/1991).
M. J. Hynes et al., "A CMOS Digitally Controlled Audio Attenuator for Hi-Fi Systems", IEEE Journal of Solid-State Circuits, vol. SC-16, Feb. 1981, No. 1, New York, pp. 15-20.
A. Kaniel, "Flexible PGA designs require few components", EDN Electrical Design News, vol. 32, No. 2, 22 Jan. 1987, Newton, Mass., US, pp. 181-187.
Mallinson Martin
Spitalny Paul
Analog Devices Inc.
Mullins James B.
LandOfFree
Programmable gain 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 Programmable gain amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable gain amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1507149