Topic
FET amplifier
About: FET amplifier is a research topic. Over the lifetime, 7048 publications have been published within this topic receiving 77549 citations.
Papers published on a yearly basis
Papers
More filters
Patent•
26 Jul 1996TL;DR: In this paper, a method and an amplifier circuit for conditioning a signal was proposed, which includes a field effect transistor (22) having a sub-harmonic termination (21) connected to a drain of the field effect transistors (22).
Abstract: A method and amplifier circuit (20) for conditioning a signal. The amplifier circuit (20) includes a field effect transistor (22) having a sub-harmonic termination (21) connected to a drain of the field effect transistor (22). In addition, an output impedance termination (24) is connected to the drain of the field effect transistor (22) and an input impedance termination (23) is connected to the gate of the field effect transistor (22). The sub-harmonic termination (21) reduces a non-linear component of an interference signal.
20 citations
Patent•
28 Jun 2002TL;DR: In this article, a high efficiency amplifier arrangement consistent with certain embodiments of the invention has an amplifier ( 104 ) that receives an input signal and amplifies the input signal to produce an output signal that drives a load ( 108 ).
Abstract: A high efficiency amplifier arrangement consistent with certain embodiments of the invention has an amplifier ( 104 ) that receives an input signal and amplifies the input signal to produce an output signal that drives a load ( 108 ). A variable impedance transformer ( 300 ) is disposed between the amplifier ( 104 ) and the load ( 108 ) to presents a varying load impedance to the output of the amplifier ( 104 ). A control mechanism, such as a programmed processor ( 604, 504 ), controls the variable impedance transformer ( 300 ) with a control signal so that the load impedance seen by the amplifier ( 104 ) varies in accordance with an envelope of the input signal. The control signal varies the load impedance in a manner that keeps the output of the amplifier ( 104 ) near a peak value. The arrangement may further include a circuit for controlling a DC input bias ( 420 ) of the amplifier ( 104 ) to keep the amplifier ( 104 ) operating within a predetermined class of operation throughout a range of input signals. The control signal may be calculated, looked up in a lookup table ( 610 ) or derived from an envelope detector ( 404 ).
20 citations
TL;DR: In this paper, an 8.2-W GaAs FET amplifier with 38.5 dB gain over a 17.7-19.1 GHz frequency band has been developed.
Abstract: An 8.2-W GaAs FET amplifier with 38.6+-0.5-dB gain over a 17.7-19.1 GHz frequency band has been developed. This amplifier combines the outputs of eight multistage amplifier modules utilizing a radial combiner. This state-of-the-art power level has been achieved with AM/PM of less than 2°/dB. The third-order intermodulation products at 1-dB gain compression were 20 dBc, and variation in group delay over the frequency band was less than +-0.25 ns. Tests show that the amplifier is unconditionally stable and follows the graceful degradation principle.
20 citations
Patent•
06 Apr 1999TL;DR: In this article, an antenna switch includes at least one signal path, including an amplifier device and a switch, and the amplifier is voltage supplied via a second inductor, which is grounded.
Abstract: An antenna switch includes at least one signal path, including an amplifier device and a switch. The amplifier device includes an amplifier connected to a first inductor and to a first capacitor, which is grounded. The amplifier is voltage supplied via a second inductor. The switch includes a receiving isolation device, which is connected to a bypass capacitor connected to an antenna via a low pass filter. A first microstrip is connected to the bypass capacitor and to a DC switch. The first inductor and the first capacitor together with a shorted output transistor of the amplifier form a high impedance in receiving mode, thereby not affecting the receiving signal. The receiving isolation device is a signal wire.
20 citations
Patent•
18 Jan 2000
TL;DR: In this paper, the photodetector is switched by sharing an amplifier by switching two kinds of photodeteectors, linking directly with the amplifier by installing input transistors of the amplifier of the same number as the photodeectors so that the performance may not be impaired with a parasitic capacitance and resistor of the switching circuit.
Abstract: PROBLEM TO BE SOLVED: To solve the disadvantage, such as the increase in chip size and power consumption when amplifiers are connected to each photodetector in the conventional manner, in order to fill the requests for a correspondence to two wavelengths, a band exceeding 100 MHz, reduction in area, and a low power, which are required at next-generation DVD/CD SOLUTION: The photodetector is switched by sharing an amplifier by switching two kinds of photodetectors, linking directly with the photodetector by installing input transistors of the amplifier of the same number as the photodetectors so that the performance of the amplifier may not be impaired with a parasitic capacitance and resistor of the switching circuit and cutting off the transistors other than the selected input The amplifier can be shared and the miniaturization and the low power consumption of the DVD/CD optical head amplifier circuit is enabled by switching the photodetector without impairing the performance of the amplifier
20 citations