Large swing wide band high order programmable active filters

Details Large swing wide band high order programmable active filters Large swing wide band high order programmable active filters

1996-02-15

1998-03-31

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327553, 327103, 327336, 327563, 327561, 330107, 330260, 330252, H03K 500, H03F 345

Patent

active

057342946

ABSTRACT:
A wide band, high-order, programmable video filter is implemented using transimpedance-based active integrators. An input voltage which may for instance represent a composite video signal is converted to a current in a linear manner using resistors and provided to a current amplifier at low impedance virtual ground nodes. The current is multiplied by a gain factor .beta..sub.R within the current amplifier and supplied to integrating capacitors connected in a feedback configuration around a high input impedance differential amplifier to establish an integrated differential voltage output. The transimpedance-based active integrators may be interconnected to realize wide-band, high-order video filters suitable for use in accordance with CCIR 601 standards. Input voltage swings are not restricted by a transistor's limited range of linear operation or voltage swing limitations of internal nodes but rather may allowed to swing as long as the bias currents sustain input current excursions. Thus, pre-filter attenuation and post-filter amplification is not required, thereby allowing CCIR 601 standard compliant video filters to be fabricated, in accordance with the present invention, as a single chip IC.

REFERENCES:
patent: 4571507 (1986-02-01), Collings
patent: 4872209 (1989-10-01), Blanken
patent: 5418492 (1995-05-01), Wang et al.
Linear Application Databook, National Semiconductor Corporation, 1986, pp. 813-819.

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