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Tunable balanced loss compensation in an electronic filter

Inactive Publication Date: 2007-08-23
SKYWORKS SOLUTIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] An object of various embodiments of the invention is to provide a balanced loss compensation for unbalanced and balanced losses in electronic filters.
[0009] Another object of various embodiments of the invention is to provide tunable balanced loss compensation in the electronic filters.

Problems solved by technology

The inductors and capacitors in electronic filters have a resistive component that causes losses in the electronic filter during transmission.
These losses result in a decrease in the quality of the frequency response provided by the electronic filter.
Moreover, these losses in the electronic filter may vary with the process, temperature and other factors.
However, the cross-coupled pair of transistors, when used for loss compensation in an unbalanced structure, results in the development of even-order harmonics.
These even-order harmonics are undesirable since they distort the frequency response of the electronic filter.

Method used

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  • Tunable balanced loss compensation in an electronic filter
  • Tunable balanced loss compensation in an electronic filter
  • Tunable balanced loss compensation in an electronic filter

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Embodiment Construction

[0015] Various embodiments of the invention provide a system for loss compensation in an electronic filter. The loss in an electronic filter may be a balanced loss or an unbalanced loss. The type of loss depends on the type of the electronic filter, such as a series LC resonator, a shunt LC resonator, or a combination thereof. The system includes a first set and a second set of transconductors. The first set of transconductors includes at least two cross-connected balanced transconductors, and the second set of transconductors includes at least two self-connected balanced transconductors. The at least two self-connected balanced transconductors compensate the balanced loss across the electronic filter. The at least two self-connected balanced transconductors and the at least two cross-connected balanced transconductors compensate the unbalanced loss across the electronic filter. Further, the at least two cross-connected balanced transconductors and the at least two self-connected ba...

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Abstract

The invention provides a system for providing tunable balanced loss compensation in an electronic filter. Tunable balanced loss compensation is provided by using cross-connected balanced transconductors and self-connected balanced transconductors. The cross-connected balanced transconductors and the self-connected transconductors compensate the unbalanced loss across the electronic filter. The self-connected balanced transconductors compensate the balanced loss across the electronic filter. Further, the cross-connected and the self-connected balanced transconductors are tunable by adjusting the values of their transconductances, thereby providing tunable balanced loss compensation.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates generally to the field of electronic filters. More specifically, the present invention relates to a system providing tunable, balanced loss compensation for an unbalanced electronic filter. [0003] 2. Description of the Related Art [0004] In communication systems, electronic filters are used for signal processing. Electronic filters eliminate unwanted frequencies from an electronic signal. Different types of electronic filters, such as low-pass filters, band-pass filters, high-pass filters, active filters and passive filters, may be used for this purpose. An electronic filter is usually a combination of inductors and capacitors, referred to as an LC circuit. The electronic filter may include one or more LC circuits and may consist of balanced and unbalanced structures. Examples of balanced structures include balanced LC oscillators and shunt LC resonators. Examples of unbalanced structur...

Claims

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Application Information

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IPC IPC(8): H03K5/00
CPCH03H11/1291H03H11/04
Inventor BAYRUNS, JOHN THOMAS
Owner SKYWORKS SOLUTIONS INC
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