Vector modulator having attenuators with continuous input...

Details Vector modulator having attenuators with continuous input... Vector modulator having attenuators with continuous input...

2005-04-07

2008-01-29

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S284000

Reexamination Certificate

active

07323933

ABSTRACT:
Variable attenuation systems having continuous input steering may be used to implement vector or quadrature modulators and vector multipliers. Discrete implementations of attenuators with continuous input steering may have two outputs which may be cross-connected to provide four-quadrant operation. A symmetrically driven center tap may provide improved zero-point accuracy.

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U.S. Appl. No. 10/887,461, filed Jul. 7, 2004 entitled Variable Attenuation System Having Continuous Input Steering by Barrie Gilbert.
Paul R. Gray and Robert G. Meyer,Analysis and Design of Analog Integrated Circuits(Third Edition), pp. 545-547 and pp. 582-583.
Editor: M.J.B. Scanlan,Modern Radar Techniques, pp. 63-69.
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Tyco Electronics M/A-COM, Inc.,High IP3 PIN Diode Variable Attenuator 0.060-1.2 GHz, pp. 1-5, published 2003.
Centellax, Inc., UVD50SC DC to 50 GHz MMIC Low Power Voltage Controlled Attenuator Data Sheet, published 2003, 8 pages.

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