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Digitally controllable on-chip resistors and methods

A technology of resistors and resistors, which is applied in the direction of adjustable resistors, resistors, circuits, etc., can solve the problem of reducing the available voltage swing, and achieve the effects of reducing parasitic capacitance, good frequency response, and saving costs

Inactive Publication Date: 2010-03-17
OPTIS WIRELESS TECH LLC
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, this method uses a binary weighting structure that results in a non-linear resistance step size
In addition, the transmission gate has a non-linear voltage-to-current ratio characteristic near the extremes of the supply voltage range, which can result in a reduction in the available voltage swing

Method used

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  • Digitally controllable on-chip resistors and methods
  • Digitally controllable on-chip resistors and methods
  • Digitally controllable on-chip resistors and methods

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Embodiment Construction

[0020] The following detailed description of the exemplary embodiments refers to the accompanying drawings. The same reference numbers in different drawings identify the same or similar elements. Also, the following detailed description does not limit the invention. Instead, the scope of the invention is defined by the appended claims.

[0021] According to example embodiments, a highly linear digitally controlled resistor structure with good frequency response can be realized in CMOS technology. The step size of resistance increase associated with the overall resistance of the digitally controlled resistor can be made arbitrarily small regardless of the on-resistance of the switch being effectively "absorbed".

[0022] The term "CMOS" may be used to refer to a particular type of digital circuit design, and / or to the family of processes used to implement circuits on integrated circuits (ie, chips). An exemplary commercial CMOS product is an integrated circuit with millions ...

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Abstract

A digitally controllable resistor includes a substrate and at least one digitally controllable resistance stage formed on the substrate. Each of the stage(s) can include a first resistor connected inseries with a switch and a second resistor connected in parallel with the first resistor and the switch. Each stage can also include a control line connected to the switch for opening and closing theswitch in response to a control bit associated therewith. Multiple resistance stages can be connected in series and the digitally controllable variable resistor can be integrated onto a substrate.

Description

technical field [0001] The present invention relates generally to resistors, and in particular to methods and apparatus associated with fabricating digitally controlled on-chip resistors. Background technique [0002] Resistors play an important role in almost all electronic circuits. In many cases, the performance of a circuit is limited by the precision of the resistors available to implement the circuit. Complementary metal-oxide-semiconductor (CMOS) chip fabrication processes are currently not capable of achieving precise resistance values. For example, the value of a resistor implemented in a CMOS chip can vary by as much as 20-30% of its design value. When implemented in CMOS to combat this probabilistic spread present in CMOS resistor products, digitally controllable resistors rely on transistor switches that change their value according to control signals. However, even in the "on" state, these switches introduce some "on-resistance" into the signal path, which ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C10/50
CPCH01C10/50
Inventor 伊玛德·胡德·丁菲利普·奥德松
Owner OPTIS WIRELESS TECH LLC
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