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Audio Signal Processing

Differential-transimpedance-amplifier

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Differential transimpedance amplifier

Details

Inventors: Giacomini, Joseph D.;
Assignee: VTC, Inc. (Bloomington, MN)
Primary Examiner: Mottola; Steven
Assistant Examiner:
Attorney, Agent or Firm: Kinney & Lange, P.A.

A differential transimpedance amplifier with reduced input impedance and increased bandwidth having a pair of input contacts, a pair of summing transistors, a pair of feedback transistors, a pair of output resistors, a pair of feedback resistors, a first and a second node and a pair of output contacts. The input contacts each being connected to one or more sources of current that are to be summed and are connected to the pair of summing transistors. The pair of feedback transistors are connected to the pair of input contacts, the pair of feedback resistors and to the first node for differentially reducing the input impedance of the pair of summing transistors and to overcome voltage excursions at the pair of input contacts to increase the operational bandwidth of the transimpedance amplifier. The pair of output resistors are connected to the pair of summing transistors for converting the current sum for each input contact into a voltage level that is transmitted differentially by the pair of output contacts that are connected to the pair of summing transistors.

DETAILED DESCRIPTION The present invention reduces the input impedance and increases the bandwidth of a differential transimpedance amplifier.
The invention comprises a pair of input contacts, summing means, negative feedback means, a pair of output resistors and a pair of output contacts.
The input contacts are connected to one or more sources of current that are to be summed as well as to the summing means which maintains the flow of current through the input contacts.
The negative feedback means are connected differentially to the input contacts and the summing means for reducing the input impedance of the summing means and to overcome voltage excursions at the input contact which increases the operational bandwidth of the transimpedance amplifier.
The pair of output resistors are connected to the summing means for converting the current sum for each input contact into a voltage level that is transmitted differentially by the pair of output contacts which are connected to the summing means.

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