Laser trimmable integrated noise circuit

Details Laser trimmable integrated noise circuit Laser trimmable integrated noise circuit

1995-07-27

1996-10-15

Grimm, Siegfried H.

Oscillators

Electrical noise or random wave generator

331182, H03B 2900

Patent

active

055658180

ABSTRACT:
Method and apparatus for an integrated noise circuit for generating broadband gaussian noise with specified spectral flatness, matching impedance, and power output characteristics. A diode section operated in an avalanche breakdown mode is the primary noise source. A resistor network is selected to provide the specified matching impedance. Additional series resistor sections in the circuit are laser trimmed in production for specified spectral flatness and output power. The integrated noise circuit may be packaged for surface mounting on a printed circuit board.

REFERENCES:
patent: 3600703 (1971-08-01), Geissler
patent: 3675148 (1972-07-01), Edwards
patent: 3967187 (1976-06-01), Edwards
patent: 5331217 (1994-07-01), Mellissinos
Drexler, "Noise Measurement Using the Y Factor", RF Design, Oct. 1988, pp. 84, 85, 87-91.

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