Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2000-11-13
2004-05-04
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S552000, C327S308000, C333S08100R
Reexamination Certificate
active
06731160
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to analog circuits in an integrated circuit environment and, in particular embodiments, to low voltage integrated circuits having both digital and analog components.
BACKGROUND OF THE INVENTION
As higher levels of circuit integration are achieved more analog functions are being mixed with digital functions on the same integrated circuit. In addition, as circuit dimensions shrink, integrated circuit supply voltages decrease. There is therefore a need in the art for techniques to facilitate the use of lower voltages in mixed integrated circuits.
SUMMARY OF THE INVENTION
The invention discloses apparatus for providing an adjustable bandwidth high pass filter while minimizing the effect on signal amplitude. A highpass filter has an input capacitor in series with a resistive ladder. The resistive ladder comprises a plurality of resistors coupled in series. The coupling between the capacitor and the first resistor of the resistive ladder defines a first tap and successive couplings between resistors form successive taps. The last resistor of said resistive ladder is coupled to a ground. A plurality of bandwidth adjusting resistors, each having a first side coupled to the first tap, are included. A plurality of switches, each providing coupling for a second side or a corresponding bandwidth adjusting resistor to said ground are also included.
REFERENCES:
patent: 3963993 (1976-06-01), Hoffman et al.
patent: 4132957 (1979-01-01), Hekimian et al.
patent: 4191995 (1980-03-01), Farrow
patent: 4274117 (1981-06-01), Tomita
patent: 4546651 (1985-10-01), Merrick
patent: 4785253 (1988-11-01), Hughes
patent: 5006735 (1991-04-01), Taylor
patent: 5157323 (1992-10-01), Ali et al.
patent: 5361001 (1994-11-01), Stolfa
patent: 5463346 (1995-10-01), Brooks
patent: 5541554 (1996-07-01), Stengel et al.
patent: 5563557 (1996-10-01), Sasaki
patent: 5880618 (1999-03-01), Koen
patent: 5909645 (1999-06-01), Abramsky et al.
patent: 6101376 (2000-08-01), Bell
patent: 358200623 (1983-11-01), None
patent: 359018421 (1984-01-01), None
U.S. patent application Ser. No. 09/712,415, Behzad, filed Nov. 13, 1999.
U.S. patent application Ser. No. 09/712,410, Behzad, filed Nov. 13, 1999.
Broadcom Corporation
Le Dinh T.
Sterne Kessler Goldstein & Fox P.L.L.C.
LandOfFree
Adjustable bandwidth high pass filter for large input... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adjustable bandwidth high pass filter for large input..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adjustable bandwidth high pass filter for large input... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3238620