Class AB differential current conveyor input stage for a fully differential current feedback amplifier
AssigneeNational Semiconductor Corporation
InventorRobert A. Malone
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Abstract
Disclosed herein is technology for, among other things, a current feedback fully differential amplifier. The amplifier includes an input stage operable to sense an input current at a first terminal and a second terminal. The input stage includes a first buffer having an input coupled with the first terminal and an output coupled with said the terminal. The input stage further includes a second buffer having an output coupled with the first terminal and an input coupled with the second terminal.
Claims26
A current feedback fully differential amplifier, comprising:
- an input stage operable to sense a differential input current at a first terminal and a second terminal, said input stage comprising:
- a first buffer having an input coupled with said first terminal and an output coupled with said second terminal;
- and
- a second buffer having an output coupled with said first terminal and said input of said first buffer, said second buffer also having an input coupled with said second terminal and said output of said first buffer:
- wherein said first buffer increases a first current and decreases a second current in response to said differential input current increasing, and wherein further said first buffer decreases said first current and increases said second current in response to said differential input current decreasing.
A current feedback fully differential amplifier, comprising:
- an input stage operable to sense a differential input current at a first terminal and a second terminal, said input stage comprising:
- a first sinh transconductor coupled with said first and second terminals and comprising a first plurality of transistors;
- and
- a second sinh transconductor coupled with said first and second terminals and said first sinh transconductor and comprising a second plurality of transistors complementary to said first plurality of transistors, wherein a PNP transistor and an NPN transistor are complementary to each other.
An amplifier, comprising:
- an input stage comprising a differential current input to a differential current output, wherein said differential current output is a reflection of the applied differential input current, wherein further said differential current output does not include a first order component due to a common mode voltage at said differential current input, and wherein further said input stage is operable to sense a first differential current and generate a second differential current based on said first differential current at said fully differential output;
- a transimpedance stage coupled with said input stage and operable to receive said second differential current and generate a first differential voltage based on said second differential current;
- and
- an output stage coupled with said transimpedance stage and operable to receive said first differential voltage and generate a second differential voltage.
A current feedback fully differential amplifier, comprising:
- an input stage operable to sense a differential input current at a first terminal and a second terminal, said input stage comprising:
- a first buffer having an input coupled with said first terminal and an output coupled with said second terminal;
- and
- a second buffer having an output coupled with said first terminal and said input of said first buffer, said second buffer also having an input coupled with said second terminal and said output of said first buffer;
- wherein said amplifier is operable at frequencies up to 2 GHz.
Dependencies are inferred from the claim text.