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US 7,446,626 B2Granted
Directional couplers for RF power detection
AssigneeSTMicroelectronics S.r.l.
InventorOleksandr Gorbachov
Life of this patent
Estimating the term…
Abstract
Very small size true directional couplers have a coupling coefficient that is independent on load VSWR. The coupler uses coupled inductors with a compensation circuit including a resistor and a capacitor, or just a capacitor. Wideband operation is suitable for many portable applications such as power detection and control for GSM, DCS-PCS, CDMA/WCDMA, Bluetooth, and WLAN systems.
Claims25
An RF coupler comprising:
- an input port;
- a coupling port;
- a load port;
- a ballast resistor port;
- a compensation circuit coupled between the input port and the coupling port;
- and
- a coupled inductor having a first terminal coupled to the input port, a second terminal coupled to the coupling port, a third terminal coupled to the load port, and a fourth terminal coupled to the ballast resistor port.
4 more elements
An RF coupler comprising:
- a GSM input port;
- a power detector port;
- a DCS-PCS input port;
- a GSM output port;
- a ballast resistance port;
- a DCS-PCS output port;
- a first compensation circuit coupled between the GSM input port and the power detector port;
- a second compensation circuit coupled between the power detector port and the DCS-PCS input port;
- and
- a coupled inductor having a first terminal coupled to the GSM input port, a second terminal coupled to the power detector port, a third terminal coupled to the DCS-PCS input port, a fourth terminal coupled to the GSM output port, a fifth terminal coupled to the ballast resistance port, and a sixth terminal coupled to the DCS-PCS output port.
7 more elements
An RF coupler comprising:
- an input port;
- a power detector port;
- an output port;
- a ballast resistor port;
- a compensation circuit coupled between the input port and the power detector port;
- a coupled inductor having a first terminal coupled to the input port, a second terminal coupled to the power detector port, a third terminal, and a fourth terminal coupled to the ballast resistor port;
- a shunt resistor coupled between the third terminal of the coupled inductor and ground;
- a series resistor coupled between the third terminal of the coupled inductor and the output port.
5 more elements
Dependencies are inferred from the claim text.