Amplifier, filter using the same, and radio communication...

Details Amplifier, filter using the same, and radio communication... Amplifier, filter using the same, and radio communication...

2007-10-30

2008-08-19

Choe, Henry K (Department: 2817)

Amplifiers

Sum and difference amplifiers

C330S295000

Reexamination Certificate

active

07414468

ABSTRACT:
An amplifier includes an amplification unit which amplify a first difference between first and second input signals, a second difference between second and third input signals and a third difference between third and first input signals by a differential mode gain, and amplify an average of the first, second and third input signal by a common mode gain, for outputting a first output signal corresponding to a sum of the amplified first difference and the amplified average, a second output signal corresponding to a sum of the amplified second difference and the amplified average, and a third output signal corresponding to a sum of the amplified third difference and amplified average; first, second; and a reduction circuit which reduces the common mode gain less than the differential mode gain.

REFERENCES:
patent: 3325653 (1967-06-01), Husher et al.
patent: 5041795 (1991-08-01), Bowers
patent: 6563380 (2003-05-01), Huijser
patent: 6781459 (2004-08-01), Brown
patent: 2007/0026835 (2007-02-01), Yamaji et al.
patent: 2001-339989 (2001-12-01), None
Koyama, et al., A 2.5-V Active Low-Pass Filter Using All-n-p-n Gilbert Cells with a 1-Vp-p Linear Input Range, IEEE Journal of Solid State Circuits, vol. 28, No. 12, pp. 1246-1253, Dec. 1993.
Itakura, et al., A 2.7-V, 200 kHz, 49-dBm, Stopband-IIP3, Low-Noise, Fully Balanced Gm-C Filter IC, IEEE Journal of Solid State Circuits, vol. 34, No. 8, pp. 1155-1159, Aug. 1999.

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