Abstract:
A device includes multiple ceramic capacitors and a current path structure. A first ceramic capacitor includes a first ceramic material between first and second electrodes. A second ceramic capacitor includes a second ceramic material between third and fourth electrodes. The second ceramic material has a higher Q than the first ceramic material. The current path structure includes a lateral conductor located between the first and second ceramic materials, and first and second vertical conductors that extend from first and second ends of the lateral conductor to a device surface. The device may be coupled to a substrate of a packaged RF amplifier device, which also includes a transistor. For example, the device may form a portion of an output impedance matching circuit coupled between a current carrying terminal of the transistor and an output lead of the RF amplifier device.
Abstract:
Embodiments include packaged semiconductor devices and methods of manufacturing packaged semiconductor devices. A semiconductor die includes a conductive feature coupled to a bottom surface of the die. The conductive feature only partially covers the bottom die surface to define a conductor-less region that spans a portion of the bottom die surface. The die is encapsulated by attaching the encapsulant material to the bottom die surface (e.g., including over the conductor-less region). The encapsulant material includes an opening that exposes the conductive feature. After encapsulating the die, a heatsink is positioned within the opening, and a surface of the heatsink is attached to the conductive feature. Because the heatsink is attached after encapsulating the die, the heatsink sidewalls are not directly bonded to the encapsulant material.
Abstract:
An amplifier module includes a module substrate. Conductive interconnect structures and an amplifier device are coupled to a top surface of the module substrate. The interconnect structures partially cover the module substrate top surface to define conductor-less areas at the top surface. The amplifier device includes a semiconductor substrate, a transistor, a conductive feature coupled to a bottom surface of the semiconductor substrate and to at least one of the interconnect structures, and a filter circuit electrically coupled to the transistor. The conductive feature only partially covers the semiconductor substrate bottom surface to define a conductor-less region that spans a portion of the bottom surface. The conductor-less region is aligned with at least one of the conductor-less areas at the module substrate top surface. The filter circuit includes a passive component formed over a portion of the semiconductor substrate top surface that is directly opposite the conductor-less region.
Abstract:
Embodiments of semiconductor devices (e.g., RF devices) include a substrate, an isolation structure, an active device, a lead, and a circuit. The isolation structure is coupled to the substrate, and includes an opening. An active device area is defined by a portion of the substrate surface that is exposed through the opening. The active device is coupled to the substrate surface within the active device area. The circuit is electrically coupled between the active device and the lead. The circuit includes one or more elements positioned outside the active device area (e.g., physically coupled to the isolation structure and/or under the lead). The elements positioned outside the active device area may include elements of an envelope termination circuit and/or an impedance matching circuit. Embodiments also include method of manufacturing such semiconductor devices.
Abstract:
Embodiments of an RF amplifier include a transistor with a control terminal and first and second current carrying terminals, and a shunt circuit coupled between the first current carrying terminal and a ground reference node. The shunt circuit includes a first shunt inductance, a second shunt inductance, and a shunt capacitor coupled in series. The second shunt inductance and the shunt capacitor form a series resonant circuit in proximity to a center operating frequency of the amplifier, and an RF cold point node is present between the first and second shunt inductances. The RF amplifier also includes a video bandwidth circuit coupled between the RF cold point node and the ground reference node.
Abstract:
An embodiment of an amplifier has a bandwidth defined by low and upper cutoff frequencies. The amplifier includes an input impedance matching circuit and a transistor. The transistor has a gate, a first current conducting terminal coupled to an output of the amplifier, and a second current conducting terminal coupled to a reference node. The input impedance matching circuit has a filter input coupled to an input of the amplifier, a filter output coupled to the gate of the transistor, and a multiple pole filter coupled between the filter input and the filter output. A first pole of the filter is positioned at a first frequency within the bandwidth, and a second pole of the filter is positioned at a second frequency outside the bandwidth. The input impedance matching circuit is configured to filter the input RF signal to produce a filtered RF signal at the filter output.
Abstract:
Apparatus are provided for amplifier systems and related circuits are provided. An exemplary circuit includes a main amplifier arrangement, first impedance matching circuitry coupled between the output of the main amplifier arrangement and a first output of the circuit, a peaking amplifier arrangement, and second impedance matching circuitry coupled between the output of the peaking amplifier arrangement and a second output of the circuit. In one exemplary embodiment, the first impedance matching circuitry and the second impedance matching circuitry have different circuit topologies and different physical topologies.
Abstract:
A radio frequency (RF) power transistor circuit includes a power transistor and a decoupling circuit. The power transistor has a control electrode coupled to an input terminal for receiving an RF input signal, a first current electrode for providing an RF output signal at an output terminal, and a second current electrode coupled to a voltage reference. The decoupling circuit includes a first inductive element, a first resistor, and a first capacitor coupled together in series between the first current electrode of the power transistor and the voltage reference. The decoupling circuit is for dampening a resonance at a frequency lower than an RF frequency.
Abstract:
Embodiments of RF amplifiers and packaged RF amplifier devices each include a transistor, an impedance matching circuit, and a video bandwidth circuit. The impedance matching circuit is coupled between the transistor and an RF I/O (e.g., an input or output lead). The video bandwidth circuit is coupled between a connection node of the impedance matching circuit and a ground reference node. The video bandwidth circuit includes a plurality of components, which includes an envelope inductor and an envelope capacitor coupled in series between the connection node and the ground reference node. The video bandwidth circuit further includes a first bypass capacitor coupled in parallel across one or more of the plurality of components of the video bandwidth circuit.
Abstract:
An embodiment of an amplifier has a bandwidth defined by low and upper cutoff frequencies. The amplifier includes an input impedance matching circuit and a transistor. The transistor has a gate, a first current conducting terminal coupled to an output of the amplifier, and a second current conducting terminal coupled to a reference node. The input impedance matching circuit has a filter input coupled to an input of the amplifier, a filter output coupled to the gate of the transistor, and a multiple pole filter coupled between the filter input and the filter output. A first pole of the filter is positioned at a first frequency within the bandwidth, and a second pole of the filter is positioned at a second frequency outside the bandwidth. The input impedance matching circuit is configured to filter the input RF signal to produce a filtered RF signal at the filter output.