摘要:
A packaged RF amplifier device includes a transistor and an output circuit. The transistor includes a control terminal and first and second current carrying terminals. The output circuit is coupled between the first current carrying terminal and an output lead. The output circuit includes first and second inductive elements coupled in series. The first inductive element, which may be a first bondwire array or an integrated inductance, is coupled between the first current carrying terminal and a node. The second inductive element, which includes a second bondwire array, is coupled between the node and the output lead. The device also includes a shunt circuit with a shunt capacitor and a third bondwire array coupled between the first current carrying terminal and the shunt capacitor. The first and second inductive elements and the third bondwire array are configured to have a desired mutual inductance.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
The embodiments described herein provide class F amplifiers and methods of operation. So implemented, the class F amplifiers can be used to provide high efficiency amplification for a variety of applications, including radio frequency (RF) applications. In general, the class F amplifiers are implemented with at least one transistor and an output matching network, where the output matching network includes a plurality of resonant circuits configured to facilitate class F amplifier operation. In addition to facilitating class F amplifier operation, the plurality of resonant circuits can also be implemented with other circuit elements to provide output impedance transformation in a way that facilitates efficient amplifier operation.
摘要:
A packaged RF amplifier device includes a transistor and an output circuit. The transistor includes a control terminal and first and second current carrying terminals. The output circuit is coupled between the first current carrying terminal and an output lead. The output circuit includes first and second inductive elements coupled in series. The first inductive element, which may be a first bondwire array or an integrated inductance, is coupled between the first current carrying terminal and a node. The second inductive element, which includes a second bondwire array, is coupled between the node and the output lead. The device also includes a shunt circuit with a shunt capacitor and a third bondwire array coupled between the first current carrying terminal and the shunt capacitor. The first and second inductive elements and the third bondwire array are configured to have a desired mutual inductance.