Back to results
US 8,299,835 B2Granted
Radio-frequency switch circuit with separately controlled shunt switching device
AssigneeSensor Electronic Technology, Inc.
InventorsAlexei Koudymov, Grigory Simin, Michael Shur, Remis Gaska
Life of this patent
Estimating the term…
Abstract
A switch circuit is provided that includes at least one main switching device and at least one shunt switching device. Each main switching device is connected in series with a conductor that carries an RF signal between an input circuit and an output circuit. Each shunt switching device is connected between a controlling terminal of the main switching device and a high frequency ground. The switch circuit can provide substantially improved OFF state isolation over other approaches.
Claims20
A circuit comprising:
- a main switching device including:
- a main controlling terminal;
- a first main supplying terminal electrically connected to an input conductor of a signal line;
- and
- a second main supplying terminal electrically connected to an output conductor of the signal line;
- a first control circuit having a first voltage output electrically connected to the main controlling terminal;
- a shunt switching device for the main controlling terminal, wherein the shunt switching device is electrically isolated from the signal line, the shunt switching device including:
- a first shunt supplying terminal electrically connected to the main controlling terminal;
- and
- a second shunt supplying terminal electrically connected to a high frequency ground;
- and
- a second control circuit, distinct from the first control circuit, having a second voltage output electrically connected to a shunt controlling terminal of the shunt switching device, wherein the shunt switching device is configured to provide a low impedance path from the main controlling terminal to the high frequency ground when the main switching device is in an off state.
9 more elements
A circuit comprising:
- an input circuit including an input conductor;
- an output circuit including an output conductor;
- a common high frequency ground for the input circuit and the output circuit;
- a main field effect transistor including:
- a main controlling terminal;
- a first main supplying terminal electrically connected to the input conductor;
- and
- a second main supplying terminal electrically connected to the output conductor;
- a first control circuit having a first voltage output electrically connected to the main controlling terminal;
- a shunt switching device for the main controlling terminal, wherein the shunt switching device is electrically isolated from the input conductor and the output conductor, the shunt switching device including:
- a first shunt supplying terminal electrically connected to the main controlling terminal;
- and
- a second shunt supplying terminal electrically connected to the common high frequency ground, wherein the shunt switching device is one of:
- a field effect transistor or a bipolar junction transistor;
- and
- a second control circuit, distinct from the first control circuit, having a second voltage output electrically connected to a shunt controlling terminal of the shunt switching device, wherein the shunt switching device is configured to provide a low impedance path from the main controlling terminal to the common high frequency ground when the main switching device is in an off state.
13 more elements
A circuit comprising:
- a main switching device including:
- a main controlling terminal;
- a first main supplying terminal electrically connected to an input conductor of a signal line;
- and
- a second main supplying terminal electrically connected to an output conductor of the signal line;
- a first control circuit having a first voltage output electrically connected to the main controlling terminal;
- a shunt switching device for the main controlling terminal, wherein the shunt switching device is electrically isolated from the signal line, the shunt switching device including:
- a first shunt supplying terminal electrically connected to the main controlling terminal;
- and
- a second shunt supplying terminal electrically connected to a high frequency ground, wherein the main switching device and the shunt switching device are monolithically integrated;
- and
- a second control circuit, distinct from the first control circuit, having a second voltage output electrically connected to a shunt controlling terminal of the shunt switching device, wherein the shunt switching device is configured to provide a low impedance path from the main controlling terminal to the high frequency ground when the main switching device is in an off state.
9 more elements
Dependencies are inferred from the claim text.