Optics: measuring and testing – Photometers – Photoelectric
Patent
1984-06-05
1987-01-27
McGraw, Vincent P.
Optics: measuring and testing
Photometers
Photoelectric
250214P, 330 59, 330308, 354410, 354425, 356226, G01J 144, G01J 146
Patent
active
046391347
ABSTRACT:
To amplify an input current present at the input of a circuit arrangement with a feedback-coupled operational amplifier, two virtually equal potentials are built up in two different current paths with a common summing point. By means of the potentials, a current flow is produced for each current path. The current flow in one current path is determined by the input current, and the current in the second current path determined by a suitable choice of the impedances on the first and second current paths. The current in the second current path is greater by a multiple than the current in the first current path.
REFERENCES:
patent: 4247186 (1981-01-01), Uchidoi et al.
patent: 4309090 (1982-01-01), Yamada
patent: 4459007 (1984-07-01), Nemoto et al.
Sedra and Smith, "Micro-Electronic Circuits", CBS College Publishing, 1982, pp. 84-85.
Ernst Leitz Wetzlar GmbH
McGraw Vincent P.
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