Differential transimpedance amplifier

A differential transimpedance amplifier comprising:

• a pair of input contacts;
• a pair of output contacts;
• a pair of summing transistors connected to the input contacts;
• a pair of output resistors connected to the output contacts and to the pair of summing transistors:
• a differential pair of feedback transistors which adjust base voltages of the summing transistors as a function of voltage levels at the input contacts;
• and
• a pair of feedback resistors connected to the pair of feedback transistors for setting the adjustment of the base voltages of the summing transistors as a function of voltage levels at the input contacts.

A differential transimpedance amplifier for providing a differential output voltage between a first and a second output contact as a function of a first input current through a first input contact and second input current through a second input contact, the amplifier comprising:

• first summing means connected to the first input contact for maintaining the flow of the first input current through the first input contact;
• second summing means connected to the second input contact for maintaining the flow of the second input current through the second input contact;
• a first feedback transistor having a base connected to the first input contact and the first summing means, an emitter connected to a first node and a collector connected to the first summing means for reducing the input impedance of the first summing means and to differentially overcome voltage excursions at the first input contact increasing the operational bandwidth of the amplifier;
• a first feedback resistor connected between the collector of the first feedback transistor and a second mode;
• second negative feedback means connected to the second input contact, the second summing means and the first node for reducing the input impedance of the second summing means and to differentially overcome voltage excursions at the second input contact increasing the operational bandwidth of the amplifier;
• a first output resistor connected between the second node and the first summing means for converting the first input current into a first voltage provided to the first output contact;
• and
• a second output resistor connected between the second node and the second summing means for converting the second input current into a second voltage provided to the second output contact.

A differential transimpedance amplifier, the amplifier comprising:

• a first and a second input contact that a first and a second input current flows through respectively;
• a first and a second summing transistor, wherein an emitter of the first summing transistor is connected to the first input contact and an emitter of the second summing transistor is connected to the second input contact;
• a first and a second node;
• a first and a second output resistor, wherein the first output resistor is connected between the second node and a collector of the first summing transistor and the second output resistor is connected between the second node and a collector of the second summing transistor;
• a first and a second feedback transistor, wherein a base and a collector of the first feedback transistor is connected to the emitter and a base of the first summing transistor, respectively, and a base and a collector of the second feedback transistor is connected to the emitter and a base of the second summing transistor, respectively;
• a first and a second feedback resistor, wherein the first feedback resistor is connected between the collector of the first feedback transistor and the second node and the second feedback resistor is connected between the collector of the second feedback transistor and the second node;
• a first and a second output contact, wherein the first output contact is connected to the collector of the first summing transistor and the second output contact is connected to the collector of the second summing transistor.

A transimpedance amplifier, the amplifier comprising:

• a first input contact connected to one or more sources of current;
• a first summing transistor having an emitter connected to the first input contact;
• a first and a second node;
• a first output resistor connected between the second node and a collector of the first summing transistor;
• a first feedback transistor having a base and a collector that are connected to the emitter and a base of the first summing transistor, respectively;
• a first feedback resistor connected between the second node and the collector of the first feedback transistor;
• and
• a first output contact connected to the collector of the first summing transistor.