Method and arrangement for increasing the dynamic range at an in

Details Method and arrangement for increasing the dynamic range at an in Method and arrangement for increasing the dynamic range at an in

1986-12-15

1989-02-14

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

250214A, 330 59, H04B 900

Patent

active

048052361

ABSTRACT:
The invention relates to a method and arrangements for increasing the dynamic range at an input stage of an optical receiver, which input stage comprises a photodiode acting as a photodetector and an amplifying means the input of which is connected to one terminal of the photodiode. The input of the amplifier is connected to a diode attenuator the dynamic resistance of which is adjusted by means of a direct current proportional to the received optical level and substantially greater than the peak value of the detected signal current. At low levels of the optical signal the diode attenuator is brought into a high-impedance state.

REFERENCES:
patent: 3611173 (1971-10-01), Goulding
patent: 3968361 (1976-07-01), Bungardner
patent: 4027152 (1977-05-01), Brown et al.
patent: 4415803 (1983-11-01), Muoi
patent: 4473745 (1984-09-01), Chown
patent: 4498197 (1985-02-01), Chown
patent: 4608542 (1986-08-01), Siegel
Haas et al-Low Noise Optical Receiver-IBM Tech. Disclosure Bulletin-vol. 23 #8 Jan. 1981, p. 3845.

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