Abstract:
An application specific integrated circuit (ASIC) can drive semiconductor devices, such as, radio frequency amplifiers, switches, etc. The ASIC can include a supply and reference voltage generation circuit, a digital core, a clock generator, a plurality of analog-to-digital converters, low and high-speed communications interfaces, drain and gate sensing circuits (that can include one or more current sense amplifiers), and a gate driver circuit. The ASIC can be a low voltage semiconductor integrated circuit.
Abstract:
A wideband active antenna system comprising an antenna having N outputs and a nominal bandwidth, each of the N outputs being directly coupled to an associated buffer amplifier, with a distance between the N outputs and a first active stage of each associated buffer amplifier preferably being maintained as short as reasonably possible and preferably no greater than 1/4 wavelength of any transmission and/or receiving frequency of the wideband active antenna system and/or preferably no greater than 0.1 wavelength of any transmission and/or receiving frequency in an extension band of frequencies lower than a lowest frequency in the nominal bandwidth of the antenna.
Abstract:
In some embodiments, circuits for providing Class-E power amplifiers are provided, the circuits comprising: a first switch having a first side and a second side; a first Class-E load network coupled to the first side of the first switch; a second Class-E load network: and a second switch having a first side and a second side, the first side of the second switch being coupled the second side of the first switch and the second Class-E load network. In some embodiments, the circuits further comprise: a third switch having a first side and a second side; a third Class-E load network coupled to the first side of the third switch; a fourth Class-E load network; and a fourth switch having a first side and a second side, the first side of the fourth switch being coupled the second side of the third switch and the fourth Class-E load network.
Abstract:
Embodiments provide a gm-ratioed amplifier. The gm-ratioed amplifier comprises a first input voltage terminal and a second input voltage terminal, a first output voltage terminal and a second output voltage terminal, and an amplifying unit. The amplifying unit may be coupled between the input voltage terminals and the output voltage terminals and may be adapted to supply an output voltage to the output terminals in dependence on an input voltage supplied to the input terminals. The amplifying unit may comprise a gm-load, which comprises a first load branch comprising a first field effect transistor, and a second load branch comprising a second field effect transistor. A first source/drain terminal and a gate terminal of the first field effect transistor may be coupled to the first output voltage terminal, and a first source/drain terminal and a gate terminal of the second field effect transistor may be coupled to the second output voltage terminal. A second source/drain terminal of the first field effect transistor and a second source/drain terminal of the second field effect transistor may be coupled with each other through a first transistor arrangement such that a linearity of response of the output voltage to the input voltage is improved.
Abstract:
In one embodiment, an apparatus comprises an integrated circuit comprising an amplifier. The amplifier can comprise a first transistor over a substrate of the integrated circuit, and a second transistor over the substrate and coupled to the first transistor. The first transistor can comprise a first source terminal, a first drain terminal, and a first gate terminal. The second transistor can comprise a second source terminal, a second drain terminal, and a second gate terminal. An input node of the amplifier can be coupled to the second transistor, such as to the second gate terminal. An output node of the amplifier can be coupled between the first and second transistors, such as by coupling the second drain terminal and the first source terminal together at the output node. In the same or other embodiments, the first and second transistors comprise thin film transistors, and the substrate comprises a flexible substrate. The first transistor comprises a threshold voltage alterable from an initial threshold voltage value to a target threshold voltage value, and the first gate terminal the first source terminal are configured to be selectively coupled together. Other examples and embodiments are described herein.
Abstract:
In one embodiment, an apparatus comprises an integrated circuit comprising an amplifier. The amplifier can comprise a first transistor over a substrate of the integrated circuit, and a second transistor over the substrate and coupled to the first transistor. The first transistor can comprise a first source terminal, a first drain terminal, and a first gate terminal. The second transistor can comprise a second source terminal, a second drain terminal, and a second gate terminal. An input node of the amplifier can be coupled to the second transistor, such as to the second gate terminal. An output node of the amplifier can be coupled between the first and second transistors, such as by coupling the second drain terminal and the first source terminal together at the output node. In the same or other embodiments, the first and second transistors comprise thin film transistors, and the substrate comprises a flexible substrate. The first transistor comprises a threshold voltage alterable from an initial threshold voltage value to a target threshold voltage value, and the first gate terminal the first source terminal are configured to be selectively coupled together. Other examples and embodiments are described herein.
Abstract:
An amplifier includes a Field Effect Transistor (FET) or a Bipolar Junction Transistor (BJT) with "hard saturation."; where the FET or the BJT to has a nearly constant drain or collector current when the drain or collector voltage is greater than the pinchoff voltage. The amplifier further includes a bias network, configured to provide a DC voltage to the FET or the BJT, a means for isolating the DC voltage from the matching network, an electrical load, and a matching network which transforms the electrical load to a resistance between the drain and the source or the collector and emitter which causes the drain or collector voltage to be greater than the pinchoff voltage over the entire cycle of the sinusoidal voltage applied to the gate, whereby the amplifier is linear.