FET amplifier

About: FET amplifier is a research topic. Over the lifetime, 7048 publications have been published within this topic receiving 77549 citations.

Co-integration of multi-gate fet with other fet devices in cmos technology

Abstract: The present invention relates to a CMOS circuit device on a SOI substrate with an oriented silicon surface, comprising on a first substrate region a FET that has a FET channel region of a first conductivity type, and comprising on a second substrate region a FinFET that has a FinFET channel region of a second conductivity type which is opposite to the first conductivity type The invention also relates to a method for fabricating such a CMOS circuit device The fabrication of the multi-gate planar FET comprises, at an intermediate step, forming a FET channel stack with an alternating sequence of layers of a FET material and of a sacrificial material and containing main FET -channel faces, which have the same orientation as the oriented silicon surface According to the invention, a co-integration of multi-gate FET devices is achieved that ensures high carrier mobilities for both NMOS and PMOS FETs

High power doherty amplifier using multi-stage modules

Abstract: A high power Doherty RF amplifier utilizes multi-stage amplifier modules for both the main amplifier and the peak amplifiers. In one embodiment of a two way two stage amplifier, the first stage of each amplifier module can include signal pre-distortion whereby the first stage compensates for distortion in both the first and second stages. The design is simple and results in a high efficiency amplifier with high gain. In one embodiment, a commercially available CREE PFM19030SM power module is used in both the main amplifier and the peak amplifier.

Common-emitter fT doubler amplifier employing a feed forward amplifier to reduce non-linearities and thermal distortion

Abstract: An improved common-emitter cascode f T doubler amplifier is provided with a feed-forward amplifier circuit to compensate for non-linearities and thermal distortion. The feed forward amplifier senses distortion at the emitters of the f T doubler amplifier transistors and injects a correction current into a pair of output nodes. The amplifier is also provided with a common-base transistor output stage.

Active pixel sensor cell with differential amplifier and array including same

Abstract: An active pixel sensor cell array in which a differential amplifier (whose output is fed back to one of its inputs) amplifies the output of each cell. By using such differential amplifiers, fixed pattern noise in the image data generated by reading the array is reduced. Part of the differential amplifier for each cell is within the cell itself and a current source and tail current sink for the differential amplifier are implemented outside the cell and shared by all cells connected along a column of the array. Preferably, the output amplifier circuitry within each cell includes no PMOS transistor (although it typically includes NMOS transistors). Another aspect of the invention is an active pixel sensor cell including part of a differential amplifier (having an output fed back to one of its inputs, and configured to assert an amplified signal indicative of a sampled output voltage of the cell's photodiode), and circuitry (physically separate from the cell) implementing a remaining portion (e.g., a current source and tail current sink) of the differential amplifier.

Drive circuit with limited signal transition rate for RFI reduction

Abstract: An amplifier applies turn-on bias to the gate electrode of an output field-effect transistor in response to a first level of an input signal applied to the amplifier. A switched power source supplies operating current to the amplifier for developing the turn-on bias when the amplifier input signal is at the first level. A feedback-controlled bypass circuit diverts a portion of the operating current from the amplifier during an initial turn-on period and gradually reduces the magnitude of the diverted operating current as the output transistor turns on thereby producing a "soft" turn-on of the output transistor so as to minimize a potential for creating radio frequency interference in nearby RFI sensitive devices such as the tuner in a television or radio receiver. Complementary circuits include dual current supply and diversion circuits providing controlled rise and fall times for complementary field-effect output transistors.