Filter circuit providing low distortion and enhanced...

Details Filter circuit providing low distortion and enhanced... Filter circuit providing low distortion and enhanced...

2006-11-21

2006-11-21

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

C330S278000, C330S282000

Reexamination Certificate

active

07138873

ABSTRACT:
A low distortion filter circuit implementing variable gain amplification (VGA). An aspect of the present invention increases the degrees of freedom (number of components which can be independently programmed/changed to corresponding desired values) to achieve a desired combination of D.C. gain and filter characteristics (e.g., corner frequency, Q-factor, notch frequency, etc.). Such additional degrees of freedom are attained by including additional components in either on input block or a feedback block (implemented with reference to an operational amplifier), and by redesigning the other block using principles such as admittance concellation to remove the effects of such additional components. The blocks are designed such that a terminal of the programmable components is connected to a fixed/constant voltage (e.g., ground). Embodiments implementing bi-quad single amplifier with and without notch are disclosed.

REFERENCES:
patent: 3701037 (1972-10-01), Holsinger
patent: 4745622 (1988-05-01), Gupta
patent: 5481225 (1996-01-01), Lumsden et al.
patent: 5880634 (1999-03-01), Babanezhad
patent: 6492876 (2002-12-01), Kamal et al.
patent: 6977541 (2005-12-01), Kurose et al.
Bruce Carter and L.P.Huelsman, “Handbook of Operational Amplifier Active RC Networks—TI Application Report SBOA093A”, from Texas Instruments, Inc., Dallas, Texas, www.ti.com, pp. 1-84, Oct. 2001.

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