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Formulations and a Computer-Aided Test Method for the
Formulations and a Computer-Aided Test Method for the

... Fig. 1 illustrates the partitioning of the GEF PA full on-chip circuits on two GaAs HBT ICs. The role of the variable gain RF amplifier section is to amplify the envelope varying RF input signal with a total gain that is adjusted by the amplified feedback error signal (CTRL). It is comprised of: 1) ...
lecture chapter 5
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IOSR Journal of VLSI and Signal Processing (IOSR-JVSP)
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... or Table 3 for the typical VOUTADJ voltage for the desired VOUT DC output offset in each gain setting. The VCC_OUT (E12) test point is an alternative output of VOUT (J3 SMA CONNECTOR). Install a 0Ω resistor or a jumper at R5 will have the VOUT at this VCC_OUT test point. The R7 and C12 footprints ar ...
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... allowed to exceed the negative supply as this will cause large currents to flow which can result in a destroyed unit. Exceeding the negative common-mode limit on either input will cause a reversal of the phase to the output and force the amplifier output to the corresponding high or low state. Excee ...
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Amplifier



An amplifier, electronic amplifier or (informally) amp is an electronic device that increases the power of a signal.It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In this sense, an amplifier modulates the output of the power supply to make the output signal stronger than the input signal. An amplifier is effectively the opposite of an attenuator: while an amplifier provides gain, an attenuator provides loss.An amplifier can either be a separate piece of equipment or an electrical circuit within another device. The ability to amplify is fundamental to modern electronics, and amplifiers are extremely widely used in almost all electronic equipment. The types of amplifiers can be categorized in different ways. One is by the frequency of the electronic signal being amplified; audio amplifiers amplify signals in the audio (sound) range of less than 20 kHz, RF amplifiers amplify frequencies in the radio frequency range between 20 kHz and 300 GHz. Another is which quantity, voltage or current is being amplified; amplifiers can be divided into voltage amplifiers, current amplifiers, transconductance amplifiers, and transresistance amplifiers. A further distinction is whether the output is a linear or nonlinear representation of the input. Amplifiers can also be categorized by their physical placement in the signal chain.The first practical electronic device that amplified was the Audion (triode) vacuum tube, invented in 1906 by Lee De Forest, which led to the first amplifiers. The terms ""amplifier"" and ""amplification"" (from the Latin amplificare, 'to enlarge or expand') were first used for this new capability around 1915 when triodes became widespread. For the next 50 years, vacuum tubes were the only devices that could amplify. All amplifiers used them until the 1960s, when transistors appeared. Most amplifiers today use transistors, though tube amplifiers are still produced.
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