Crosstalk suppression in differential AC coupled multichannel IC amplifiers
First Claim
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1. A multichannel IC amplifier, comprising a plurality of amplifier circuits formed on an IC substrate, each amplifier circuit defining a channel and each amplifier circuit coupled to respective inputs via a pair of capacitors, the capacitors being configured so as to substantially equalize like sense and unlike sense coupling between adjacent channels.
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Abstract
A multichannel parallel IC amplifier includes a plurality of amplifier circuits formed on an IC substrate. Each amplifier circuit is coupled to respective inputs via a pair of capacitors. The capacitors are configured so as to substantially equalize like sense and unlike sense coupling between adjacent channels, leading to cancellation of crosstalk signals.
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Citations
9 Claims
- 1. A multichannel IC amplifier, comprising a plurality of amplifier circuits formed on an IC substrate, each amplifier circuit defining a channel and each amplifier circuit coupled to respective inputs via a pair of capacitors, the capacitors being configured so as to substantially equalize like sense and unlike sense coupling between adjacent channels.
- 6. A method of suppressing crosstalk between adjacent channels in a multichannel IC amplifier, comprising coupling substantially equal crosstalk signals to each capacitor of a pair of capacitors for a given channel.
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8. A method of suppressing crosstalk between adjacent channels in a multichannel IC amplifier, comprising:
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providing a substrate;
forming a plurality of amplifier circuits on the substrate, each amplifier circuit defining a channel;
forming a pair of inputs for each amplifier circuit; and
coupling each pair of inputs for each amplifier circuit to the amplifier circuit via a pair of capacitors configured so as to substantially equalize like sense and unlike sense coupling between adjacent channels.
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9. A multichannel IC amplifier, comprising:
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at least first and second amplifier circuits formed on an IC substrate, each amplifier circuit defining a channel and each amplifier circuit coupled to respective inputs via a pair of capacitors, the capacitors being configured so as to substantially equalize like sense and unlike sense coupling between adjacent channels;
wherein the two pair of capacitors comprise a coplanar arrangement of four capacitor plates, each corresponding to a respective DC-blocking capacitor, the four plates respectively corresponding to a left-channel positive-sense capacitor, a left-channel negative-sense capacitor, a right-channel positive-sense capacitor and a right-channel negative-sense capacitor, the plate corresponding to the left-channel positive-sense capacitor and the plate corresponding to the right-channel positive-sense capacitor defining therebetween a first shared edge region having a length U, the plate corresponding to the left-channel negative-sense capacitor and the plate corresponding to the right-channel positive sense capacitor defining therebetween a second shared edge region having a length 2U, and the plate corresponding to the left-channel negative-sense capacitor and the plate corresponding to the right-channel negative-sense capacitor defining therebetween a third shared edge region having a length U.
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Specification