Temperature and frequency variable gain attenuator

Details Temperature and frequency variable gain attenuator Temperature and frequency variable gain attenuator

2007-05-08

2007-05-08

Jones, Stephen E. (Department: 2817)

Wave transmission lines and networks

Attenuators

C333S02800T, C338S216000

Reexamination Certificate

active

11107557

ABSTRACT:
A temperature and frequency variable gain attenuator comprises a temperature variable attenuator and a temperature variable filter network whose resistances changed to c generate different responses that vary over temperature and frequency. At least three different thick film thermistors are used, with two of these used on the attenuator and a third one used on the filter network. The temperature coefficients of the thermistors are different and are selected so that the attenuator and filter network attenuation change at a controlled rate with changes in temperature while the impedance of the gain equalizer remains within acceptable levels. Substantially any temperature coefficient of resistance can be created for each resistor by properly selecting and mixing different inks when forming the thick film thermistors. Furthermore, the attenuator can have either a negative temperature coefficient of attenuation or a positive temperature coefficient of attenuation.

REFERENCES:
patent: 5332981 (1994-07-01), Mazzochette et al.
patent: 7119632 (2006-10-01), Blacka et al.
patent: 2006/0028289 (2006-02-01), Blacka

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