Photo-feedback preamplifier circuit

Details Photo-feedback preamplifier circuit Photo-feedback preamplifier circuit

1979-11-23

1981-08-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including combined diverse-type semiconductor device

330293, 330308, H03F 134, H03F 316

Patent

active

042849608

ABSTRACT:
A light emitting diode is modulated by the output signal of a F.E.T. amplifier, and the resulting light signal is fed back to the amplifier input via an optical fiber and a light detecting photo diode. Thus, current feedback is achieved with very flat frequency response over a full frequency band by modulating a light emitting diode with the preamplifier output signal, reconverting the resultant radiation to an electrical signal, which is then fed back to the preamplifier input.

REFERENCES:
patent: 3611173 (1971-10-01), Goulding et al.
patent: 4053847 (1977-10-01), Kumahara et al.
Koeblitz, "Photocell in Feedback Circuit Regulates Output," Electronic Design, Jun. 21, 1963, pp. 76, 77.
Galetto et al., "Optical Closed-Loop Analog Amplifier and Detector," IBM Tech. Disclosure Bulletin, pp. 2848-2849, Mar. 1975.
Lyk, "A Low-Noise Preamplifier for Semiconductors with Optoelectronic Feedback," Instruments and Experimental Techniques, vol. 18, No. 2, PT..sup.2, pp. 491-492, Mar.-Apr. 1975.

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