Input cancellation circuit

Details Input cancellation circuit Input cancellation circuit

2008-04-24

2009-10-13

Le, Don P (Department: 2819)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

C324S110000, C326S021000

Reexamination Certificate

active

07602169

ABSTRACT:
A system and method are provided for isolating an input without adding significant distortion and without significantly adversely affecting the bandwidth of input circuits. In one embodiment, a single ended signal is substantially cancelled by an arrangement including an input resistance path in parallel with a negative resistance path wherein both paths substantially match in resistance. In another embodiment, a differential signal is substantially cancelled by a pseudo differential arrangement including two independent input resistance paths each in parallel with a corresponding negative resistance path, wherein the resistance paths substantially match the input resistance paths. In yet another embodiment, a differential signal is substantially cancelled by a differential arrangement including two resistance paths wherein a first negative resistance path is coupled between the first differential input and the second differential output and the second negative resistance path is coupled between the second input and the first output. In yet another embodiment, a current controlled current source may provide the negative amplification for the negative resistance path.

REFERENCES:
patent: 3243740 (1966-03-01), Sziklai
patent: 3665476 (1972-05-01), Taylor
patent: 6985035 (2006-01-01), Khorramabadi

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