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US 7,576,626 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.
Claims20
A radio frequency (RF) directional coupler, comprising:
- a substrate;
- an input port on the substrate;
- a coupling port on the substrate;
- a load port on the substrate;
- a ballast resistor port on the substrate;
- and
- a coupled inductor on the substrate comprising a first inductor having a first terminal coupled to the input port, a second terminal coupled to the load port, a second inductor having a first terminal coupled to the coupling port and a second terminal coupled to the ballast resistor port, wherein the coupled inductor has a footprint less than about 165 microns by about 155 microns.
4 more elements
A radio frequency (RF) directional coupler, comprising:
- a substrate;
- a GSM input port on the substrate;
- a power detector port on the substrate;
- a DOS-PCS input port on the substrate;
- a GSM output port on the substrate;
- a ballast resistance port;
- a DCS-PCS output port on the substrate;
- a coupled inductor on the substrate comprising a first inductor having a first terminal coupled to the GSM input port and a second terminal coupled to the GSM output;
- a second inductor having a first terminal coupled to the power detector port and a second terminal coupled to the ballast resistance port, wherein the second inductor is in a substantially stacked relationship over the first inductor;
- and a third inductor having a first terminal coupled to the DCS-PCS input port and a second terminal coupled to the DCS-PCS output port, wherein the third inductor is in a substantially stacked relationship over the second inductor.
7 more elements
A radio frequency (RF) directional coupler, comprising:
- a substrate;
- an input port on the substrate;
- a coupling port on the substrate;
- a load port on the substrate;
- a ballast resistor port on the substrate;
- and
- a coupled inductor on the substrate comprising a first inductor having a first terminal coupled to the input port and a second terminal coupled to the load port;
- and a second inductor having a first terminal coupled to the coupling port and a second terminal coupled to the ballast resistor port, wherein at least a portion of the first inductor is arranged over the second inductor.
5 more elements
Dependencies are inferred from the claim text.