Distributed circuit
AssigneeNippon Telegraph and Telephone Corporation
InventorsTeruo Jo, Munehiko Nagatani, Hideyuki Nosaka
Life of this patent
Estimating the term…
Abstract
A distributed amplifier includes: a transmission line having an input end that an input signal is input to; a transmission line having an output end that an output signal is output from; an input termination resistor connected to an end terminal of the transmission line; a plurality of unit cells arranged along the transmission lines, and having input terminals connected to the transmission line and output terminals connected to the transmission line; and a variable current source having one end connected to the end terminal of the transmission line and another end connected to a power supply voltage, and capable of adjusting a current amount between the transmission line and the power supply voltage.
Claims13
A distributed circuit comprising:
- a first transmission line having an input end configured to receive an input signal;
- a second transmission line having an output end configured to output an output signal;
- a termination resistor connected to an end terminal of the first transmission line;
- an output termination resistor connecting an input end of the second transmission line to ground;
- a plurality of unit cells arranged along the first and second transmission lines, each of the plurality of unit cells having an input terminal connected to the first transmission line and output terminal connected to the second transmission line;
- and
- a first variable current source having a first end connected to the end terminal of the first transmission line and a second end connected to a power supply voltage,
- wherein:
- the first variable current source is configured to adjust an amount of current between the first transmission line and the power supply voltage, and
- the first variable current source comprises a plurality of variable current sources arranged at a position downstream of a final-stage unit cell of the plurality of unit cells and upstream of the termination resistor along the first transmission line, each of the plurality of variable current sources having a first end connected to the first transmission line and a second end connected to the power supply voltage, and each of the plurality of variable current sources being configured to adjust the amount of current between the first transmission line and the power supply voltage.
A method comprising:
- receiving, by an input end of a first transmission line, an input signal, wherein a termination resistor is connected to an end terminal of the first transmission line;
- outputting, by an output end of a second transmission line, an output signal, wherein:
- an output termination resistor connects an input end of the second transmission line to ground;
- and
- a plurality of unit cells is arranged along the first and second transmission lines, each of the plurality of unit cells having an input terminal connected to the first transmission line and output terminal connected to the second transmission line;
- and
- adjusting, via a first variable current source, an amount of current between the first transmission line and a power supply voltage, the first variable current source having a first end connected to the end terminal of the first transmission line and a second end connected to the power supply voltage,
- wherein the first variable current source comprises a plurality of variable current sources arranged at a position downstream of a final-stage unit cell of the plurality of unit cells and upstream of the termination resistor along the first transmission line, each of the plurality of variable current sources having a first end connected to the first transmission line and a second end connected to the power supply voltage, and each of the plurality of variable current sources being configured to adjust the amount of current between the first transmission line and the power supply voltage.
Dependencies are inferred from the claim text.