Topic
FET amplifier
About: FET amplifier is a research topic. Over the lifetime, 7048 publications have been published within this topic receiving 77549 citations.
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TL;DR: A high-speed small-area DRAM sense amplifier with a threshold-voltage (V/sub T/) mismatch compensation function is proposed, which eliminates the sensitivity degradation and the area overhead increase that are expected in gigabit-scale DRAM arrays.
Abstract: A high-speed small-area DRAM sense amplifier with a threshold-voltage (V/sub T/) mismatch compensation function is proposed. This sense amplifier features a novel hierarchical data-line architecture with a direct sensing scheme that uses only NMOS transistors in the array, and simple V/sub T/ mismatch compensation circuitry using a pair of NMOS switching transistors. The layout area of the sense amplifier is reduced to 70% of that of a conventional CMOS common I/O sense amplifier due to the removal of PMOS transistors from the array. The readout time is improved to 35% of that of a conventional CMOS sense amplifier because of direct sensing and a 1/10 reduction in V/sub T/ mismatch. This sense amplifier eliminates the sensitivity degradation and the area overhead increase that are expected in gigabit-scale DRAM arrays. >
30 citations
Patent•
01 Jun 1993TL;DR: In this article, a low power consumption amplifier that is essentially insensitive to the process used to fabricate the active devices of the amplifier employs feedback to minimize variations in electrical characteristics of the devices.
Abstract: A low power consumption amplifier that is essentially insensitive to the process used to fabricate the active devices of the amplifier employs feedback to minimize variations in electrical characteristics of the devices. For weight-sensitive microwave applications, a high electron mobility transistor (HEMT) or a pseudomorphic high electron mobility transistor (PHEMT) may be selected as an active device for each stage of the amplifier. HEMTs and PHEMTs typically exhibit greater device gain than do MESFETs, especially at the upper portion of X-band and above, so that a HEMT- or PHEMT-based stage of an amplifier where additional overall gain is required, can be achieved without significantly adversely affecting power consumption demands, and attendant electrical energy storage/generation requirements while achieving and/or maintaining an overall flat gain characteristic of the amplifier.
30 citations
Patent•
NEC1
TL;DR: In this paper, a composite differential amplifier with a lower voltage and a lower power consumption of the circuit thereof is presented, in which an output of a differential amplifier is inputted into an emitter-follower and is delivered as a DC voltage from each of transistors of the emitter to a non-inverting input terminal or an operational amplifier.
Abstract: There is provided a composite differential amplifier with a lower voltage and a lower power consumption of the circuit thereof. An output of a differential amplifier is inputted into an emitter-follower and is delivered as a DC voltage from an emitter of each of transistors of the emitter-follower to a non-inverting input terminal or an operational amplifier. Then, an output of the operational amplifier is supplied to a variable current source. The variable current source at its current drain side is connected to a resistance side of the differential amplifier so that an external control voltage inputted to the non-inverting input side of the operational amplifier is equal to the DC output voltage of the differential amplifier.
30 citations
Patent•
13 Nov 2002
TL;DR: In this paper, a sensing amplifier is provided in the feedback loop to sense the oscillator amplitude and draw current away only when the positive peak voltage Is above a certain value, which is called peak positive input (PPI).
Abstract: A VCO having an automatic amplitude control circuit In the form of a sensing amplifier provided in the feedback loop to sense the oscillator amplitude and draw current away only when the positive peak voltage Is above a certain value. In general, any amplifier may be used in the feedback loop that outputs current proportional to a peak positive input (in a non-linear and asymmetric fashion with respect to the changing voltage). In one example, the amplifier in the feedback loop comprises first and second transistors that are set nominally in cut off and behave as class C amplifiers. The advantage of this amplifier transistor configuration is that the amplifier they form has a low load on the LC tank circuit and a high input impedance.
30 citations
Patent•
11 Jun 1992TL;DR: In this paper, an all-optical gain-switchable optical fiber amplifier which can be remotely gain switched is presented. But the amplifier/feedback-loop system has a finite number, greater than one, of stable gain operation states.
Abstract: This invention is an all-optical gain-switchable optical fiber amplifier which can be remotely gain switched. In an embodiment of the invention a feedback loop is connected between the output port (72) and the input port (71) of an optical fiber amplifier (78). A nonlinear lossy material (74) is placed in the feedback loop. When so connected, the amplifier/feedback-loop system has a finite number, greater than one, of stable gain operation states. The system can be switched from one state to another by injecting into the amplifier optical energy of appropriate wavelength and power. In a specific embodiment, the optical fiber amplifier and/or the nonlinear medium may comprise an erbium-doped optical fiber.
30 citations