Abstract:
In accordance with an embodiment, a switchable capacitance circuit includes a plurality of capacitance-switch cells that each have a capacitance circuit having a capacitance between a first terminal and a second terminal of the capacitance circuit, and a semiconductor switching circuit including a first terminal coupled to the first terminal of the capacitance circuit, a plurality of series connected radio-frequency (RF) switch cells having a load path and a common node. Each of the plurality of series connected RF switch cells has a switch transistor and a gate resistor having a first end coupled to a gate of the switch transistor and a second end coupled to the common node. The switchable capacitance circuit also includes a resistance circuit having a first end coupled to the common node and a second end coupled to a control node.
Abstract:
A circuit includes a switching element with a first terminal, a second terminal and a control terminal. The circuit also includes an impedance network coupled between the control terminal and a switching node. The circuit also includes a first accelerating element coupled between the control terminal and a first node. The first node is different from the switching node. The circuit is configured to temporarily activate the first accelerating element when a switching state of the switching element is to be changed.
Abstract:
An antenna tuning circuit is provided. The antenna tuning circuit includes an antenna, an inductor and a variable capacitance. The antenna includes a first terminal, which serves as a feed terminal, and a second terminal, which is separate from the first terminal. The inductor and the variable capacitance are coupled to the second terminal, to tune the antenna.
Abstract:
A radio frequency switch includes a first transistor and a second transistor coupled together to establish a switchable RF path, and a first compensation network coupled between the body terminal of the first transistor and the drain terminal of the second transistor, wherein the first compensation network establishes a path for current flowing between the body terminal of the first transistor and the drain terminal of the second transistor in a first direction and blocks current flowing in a second direction opposite to the first direction.
Abstract:
A radio frequency switch includes a first transistor and a second transistor coupled together to establish a switchable RF path, and a first compensation network coupled between the body terminal of the first transistor and the drain terminal of the second transistor, wherein the first compensation network establishes a path for current flowing between the body terminal of the first transistor and the drain terminal of the second transistor in a first direction and blocks current flowing in a second direction opposite to the first direction.
Abstract:
A radio frequency, RF, switch device includes a plurality of switch units, wherein the switch units are coupled in series between a first series terminal and a second series terminal to establish a switchable RF path; and a plurality of ballasting capacitor units, wherein each ballasting capacitor unit is coupled in parallel to a respective switch unit, to provide a selectable capacitance in parallel to a signal path of the respective switch unit, wherein each ballasting capacitor unit includes at least one ballasting capacitor switch element to switch the capacitance of the ballasting capacitor unit between a first capacitance value and a second capacitance value, wherein the second capacitance value is larger than the first capacitance value.
Abstract:
An RF switch includes series-coupled RF switch cells coupled between an RF input and ground, a transistor including a first current node coupled to a first load resistor, a second current node coupled to ground, and a control node coupled to an internal switch node, and a filter having an input coupled to the first current node of the first transistor and an output for providing a DC voltage corresponding to the RF power present at the internal switch node.
Abstract:
In accordance with an embodiment, a circuit includes an RF switch, a leakage compensation circuit having a bias port and a reference port, a replica resistor coupled between a reference node and the reference port of the leakage compensation circuit, and a bias resistor coupled between the bias port of the leakage compensation circuit and a load path of the RF switch. The leakage compensation circuit configured to mirror a current from the bias port to the reference port, and apply a voltage from the reference port to the bias port.
Abstract:
In accordance with an embodiment, a method of testing an integrated circuit, includes receiving a supply voltage on the integrated circuit via a first input pin, providing power to circuits disposed on the integrated circuit via the first input pin, comparing the supply voltage to an internally generated voltage, generating a digital output value based on the comparing, and applying the digital output value to a pin of the integrated circuit.
Abstract:
In accordance with an embodiment, an integrated circuit includes a substrate, an amplifier MOSFET, and a bias voltage terminal configured to generate a potential difference of the substrate relative to at least one load terminal of the amplifier MOSFET.