US 12,633,886 B2Granted

Active biasing and termination approach for distributed amplifier circuit

AssigneeAnalog Devices, Inc.

InventorChristopher Eugene Hay

Life of this patent

Estimating the term…

Loading patent…

Abstract

An integrated distributed amplifier circuit can include an input transmission line structure comprising first unit cells including a first reactive circuit element and a first active circuit element, an output transmission line structure comprising second unit cells including a second reactive circuit element and a second active circuit element, and a termination circuit coupled to an end of the input transmission line structure. The termination circuit can include a current mirror circuit to establish a specified bias current for biasing respective first active circuit elements of the input transmission line structure. Such an approach can provide one or more of a broadband termination impedance and stable biasing conditions across different frequencies and power output levels.

Claims20

Dependent claims

A distributed amplifier circuit, comprising:

an input transmission line structure comprising first unit cells, a respective one of the first unit cells comprising a first reactive circuit element and a first active circuit element, the first reactive circuit element coupled to an input node of the first active circuit element, an input port of the input transmission line structure defining a signal input port of the distributed amplifier circuit;
an output transmission line structure comprising second unit cells, a respective one of the second unit cells comprising a second reactive circuit element and a second active circuit element, the second reactive circuit element coupled to an output node of the second active circuit element, an output port of the output transmission line structure defining an amplified signal output port of the distributed amplifier circuit;
and
a termination circuit coupled to an end of the input transmission line structure, the termination circuit configured to establish a specified termination impedance, the termination circuit comprising a current mirror circuit to establish a specified bias current for biasing respective first active circuit elements of the input transmission line structure;
and
wherein the respective first active circuit elements are coupled with respective second active circuit elements to form respective amplifier circuits, the respective amplifier circuits coupled with each other in a cascaded manner using respective first reactive circuit elements and respective second reactive circuit elements.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/221,329Filed 12 Jul 2023
Published: US 2025/0023527 A116 Jan 2025
Granted: 19 May 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H03F 3/245
Of transmitter output stages: with semiconductor devices only
H03F 3/607
Distributed amplifiers: using FET's
H03F 1/223
By use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively: with mosfet's
H03F 1/342
Negative-feedback-circuit arrangements with or without positive feedback: in field-effect transistor amplifiers