Semiconductor integrated circuit

Details Semiconductor integrated circuit Semiconductor integrated circuit

2005-04-12

2005-04-12

Scott, James R. (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

C336S232000, C257SE27046

Reexamination Certificate

active

06879234

ABSTRACT:
Electrically conductive layers1aand2aconnected to each other via a contact form one inductor, while electrically conductive layers1band2bconnected to each other via other contact form the other inductor. Since the areas defined by the loops forming these two inductors are equal to each other, the inductances of the inductors are also equal to each other. Between both the inductors, the lengths in the loop of the portions (the conductive layers1aand1b) formed on a lower interlayer insulating film are equal to each other, while the lengths in the loop of the portions (the conductive layers2aand2b) formed on an upper interlayer insulating film are also equal to each other. This allows external disturbances such as parasitic capacitance to affect both the inductors equally. Accordingly, a voltage controlled oscillator incorporating the invention can stably provide undistorted sinusoidal oscillation signals.

REFERENCES:
patent: 5610433 (1997-03-01), Merrill et al.
patent: 6380835 (2002-04-01), Lee
patent: 1998-020010 (1998-06-01), None
patent: 2001-0011350 (2001-02-01), None
Craninckx et al., “A 1.8-GHz Low-Phase-Noise CMOS VCO Using Optimized Hollow Spiral Inductors,”IEEE Journal of Solid-State Circuits, vol. 32, No. 5, May 1997, pp. 736-744.
Ham et al., “Concepts and Methods in Optimization of Integrated LC VCOs,”IEEE Journal of Solid-State Circuits, vol. 36, No. 6, Jun. 2001, pp. 896-909.
Tiebout, “Low-Power Low-Phase-Noise differentially Tuned Quadrature VCO Design in Standard CMOS,”IEEE Journal of Solid-State Circuits, vol. 36, No. 7, Jul. 2001, pp. 1018-1024.

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