Wideband low power active isolator
AssigneeHuawei Technologies Co., Ltd.
InventorMelin Ngwar
Life of this patent
Estimating the term…
Abstract
A wideband low power active isolator that may operate with a low voltage supply and provide improved linearity and insertion loss is described. The active isolator includes parallel connected common gate amplifier and common drain amplifier that are implemented using active transistors. A RF choke configured to suppress RF signal is coupled between input to the common gate amplifier and the ground such that the common gate amplifier also functions as a current source biasing the common drain amplifier.
Claims15
An active isolator circuit having an input and an output, the active isolator circuit comprising:
- a first transistor configured as a common gate amplifier;
- a second transistor configured as a common drain amplifier,
- wherein the common gate amplifier and the common drain amplifier are parallel connected between the input and the output;
- and
- a RF signal blocking device coupled between an input terminal of the common gate amplifier and a ground, the RF signal blocking device configured to suppress RF signals such that the common gate amplifier also functions as a current source biasing the common drain amplifier via an output terminal.
A method of providing an active isolator circuit, the method comprising:
- providing a first transistor configured as a common gate amplifier;
- providing a second transistor configured as a common drain amplifier,
- parallel connecting the common gate amplifier and the common drain amplifier between an input of the active isolator circuit and an output of the active isolator circuit;
- and
- connecting an RF signal blocking device between the input of the active isolator circuit and a ground, the RF signal blocking device being configured such that the common gate amplifier also functions as a current source biasing the common drain amplifier.
Dependencies are inferred from the claim text.