Multi-track integrated circuit inductor
First Claim
1. An integrated circuit inductor, comprising:
- a substrate;
an inductor metallization pattern in contact with the substrate and having a planar inductor topology including a layer of multiple tracks side-by-side separated by a gap,wherein starting points of the multiple tracks of the layer are joined together side-by-side and ending points of the multiple tracks of the layer are joined together side-by-side; and
a shield formed within the substrate, the shield including a plurality of diffusion layers interdigitated with a plurality of second gaps, the plurality of diffusion layers being configured and arranged to form a plurality of fingered patterns, whereinthe plurality of fingered patterns are connected together using a ring of conductive material, the ring of conductive material including a cut, the cut being configured to cause a current to flow around the ring of conductive material in one direction to a single ground point.
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Accused Products
Abstract
An integrated receiver with channel selection and image rejection substantially implemented on a single CMOS integrated circuit is described. A receiver front end provides programmable attenuation and a programmable gain low noise amplifier. Frequency conversion circuitry advantageously uses LC filters integrated onto the substrate in conjunction with image reject mixers to provide sufficient image frequency rejection. Filter tuning and inductor Q compensation over temperature are performed on chip. The filters utilize multi track spiral inductors with shields to increase circuit Q. The filters are tuned using local oscillators to tune a substitute filter, and frequency scaling during filter component values to those of the filter being tuned. In conjunction with filtering, frequency planning provides additional image rejection. The advantageous choice of local oscillator signal generation methods on chip is by PLL out of band local oscillation and by direct synthesis for in band local oscillator. The VCOs in the PLLs are centered using a control circuit to center the tuning capacitance range. A differential crystal oscillator is advantageously used as a frequency reference. Differential signal transmission is advantageously used throughout the receiver. ESD protection is provided by a pad ring and ESD clamping structure that maintains signal integrity. Also provided are shunts at each pin to discharge ESD build up. The shunts utilize a gate boosting structure to provide sufficient small signal RF performance, and minimal parasitic loading.
75 Citations
21 Claims
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1. An integrated circuit inductor, comprising:
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a substrate; an inductor metallization pattern in contact with the substrate and having a planar inductor topology including a layer of multiple tracks side-by-side separated by a gap, wherein starting points of the multiple tracks of the layer are joined together side-by-side and ending points of the multiple tracks of the layer are joined together side-by-side; and a shield formed within the substrate, the shield including a plurality of diffusion layers interdigitated with a plurality of second gaps, the plurality of diffusion layers being configured and arranged to form a plurality of fingered patterns, wherein the plurality of fingered patterns are connected together using a ring of conductive material, the ring of conductive material including a cut, the cut being configured to cause a current to flow around the ring of conductive material in one direction to a single ground point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A shield formed within a substrate including a layer of multiple tracks, comprising:
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a plurality of diffusion layers interdigitated with a plurality of gaps, the plurality of diffusion layers being configured and arranged to form a plurality of fingered patterns, wherein the plurality of fingered patterns are connected together using a ring of conductive material, the ring of conductive material including a cut, the cut being configured to cause a current to flow around the ring of conductive material in one direction to a single ground point.
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Specification