Differential CMOS current amplifier with controlled bandwidth and common mode distortion
AssigneeAdvanced Micro Devices, Inc.
InventorYi Cheng
Life of this patent
Estimating the term…
Abstract
A differential current amplifier operating at a low power while maintaining high linearity includes a bridge arrangement of current mirrors connected to each input node of the amplifier, and a common mode feedback circuit. Opposite legs of the bridge are controlled commonly, but complementary to the other legs. An integrated resistor network of the current amplifier balances delay of the output current and controls amplifier bandwidth.
Claims30
A line driver comprising:
- a plurality of input terminals,
- first and second output terminals, and
- a plurality of current mirror circuits coupled to said plurality of input terminals, said plurality of current mirror circuits including a first pair of current mirror circuits connected to said first output terminal, and a second pair of current mirror circuits connected to said second output terminal, said first and second output terminals being connected with each other to arrange the current mirror circuits into a bridge configuration.
A method of operating a line driver having a plurality of current mirror circuits coupled to a plurality of input terminals, said plurality of current mirror circuits including a first and a second pair of the current mirror circuits respectively coupled to first and second output terminals connected with each other to arrange the current mirror circuits in a bridge configuration, the method comprising the steps of:
- inputting input signals to the input terminals;
- simultaneously controlling the current mirror circuits in the first pair of the current mirror circuits;
- simultaneously controlling the current mirror circuits in the second pair of the current mirror circuits, wherein said first and second pairs of the current mirror circuits are controlled complementary to each other;
- and
- supplying an amplified current via the first and second output terminals.
An amplifier comprising:
- a first pair of current mirror circuits being commonly controlled;
- a second pair of current mirrors circuit being commonly controlled;
- and
- driver circuitry for controlling said first and second pairs of current mirror circuits in a complementary manner.
Dependencies are inferred from the claim text.