Do amplifiers change frequency?
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| Papers (8) | Insight |
|---|---|
58 Citations | It is shown that phase shifts contributed by imperfect operational amplifiers are virtually eliminated over an extended frequency range. |
14 Citations | This is at least an order of magnitude better than the figures known up to date for high-frequency (0.1–1 GHz) amplifiers. |
| This paper can be used to inspect the nonlinearity of RF amplifiers under large-signal modulated excitations in both the frequency and time domains. | |
20 May 2001 48 Citations | This paper describes an improved technique to model envelope memory effects for amplifiers exhibiting both high and low frequency memory. |
15 Apr 2012 | Large signal (RF pulsed and two tone intermodulation) confirm the impact of those parasitic effects on performances of Power Amplifiers. |
23 Citations | These results correlate well with laboratory observations of gain-induced oscillation in such amplifiers. |
15 Citations | These are clear performance advantages over previous published works and commercially available amplifiers at a similar frequency band and power level. |
29 Citations | The approach is suitable for the experimental characterization of existing amplifiers |
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How wideband of amplifier affect signal?4 answersWideband amplifiers have a significant impact on signal transmission. They can enlarge wideband signals, improving signal strength and increasing the speed of signal transmission. Wideband amplifiers with controllable gain and high flatness offer the advantage of adjustable gain and high flatness, making them suitable for a wide range of applications. In certain applications, wideband amplifiers provide advantages over oscillators, such as targeted heating of specific plasma layers in fusion plasma heating. These amplifiers have demonstrated tunability over a wide range of frequencies, making them suitable for long pulse to continuous wave operation. Additionally, wideband amplifiers can support small input level signals by implementing readily adjustable gain, making them suitable for wideband signal communication circuits. Overall, wideband amplifiers play a crucial role in enhancing signal transmission and enabling various applications.
How does an amplifier works?5 answersAn amplifier works by taking an input signal and increasing its amplitude to produce an amplified output signal. It achieves this through various components and circuits. The amplifying circuit is connected to the input circuit and power supply circuit, allowing it to receive and amplify the input signal using an amplifying gain. The amplifier circuit includes an amplification transistor, bias circuit, inductor, and variable resistance circuit. The amplification transistor amplifies the high-frequency signal, while the bias circuit supplies a bias current to control the transistor. The inductor and variable resistance circuit are connected to the transistor to further enhance the amplification. Another amplifier design includes a biasing unit, amplifying unit, and Schmitt trigger. The biasing unit generates a bias current independent of the power supply, increasing power supply rejection ratio. The amplifying unit receives an input voltage and generates an amplified voltage based on the biasing current. The Schmitt trigger then generates and outputs a modified voltage. Additionally, an amplifier circuit can have two-stage amplifiers that provide high gain in high-gain mode and switch to single-stage amplification in low-gain mode by turning off the second-stage amplifier and coupling the first-stage amplifier to the output end through a signal isolation element. Finally, an amplifier circuit may include a voltage offset providing circuit and a voltage control capacitor to compensate for the amplifier circuit. The voltage offset providing circuit creates an offset voltage, and the voltage control capacitor adjusts the capacitance value based on the output voltage of the amplifier.
Literature reviews on how does an amplifier works?3 answersAn amplifier is a device that increases the amplitude of an input signal to produce a larger output signal. Different types of amplifiers have been developed using various technologies such as Complementary to Metal Oxide Semiconductor (CMOS), Gallium Nitride Monolithic Microwave integrated circuit (GaN MMIC), Gallium Nitride high electron mobility transistor Doherty (GaN HEMT Doherty), Aluminum Gallium Nitride (AlGaN), high electron-mobility transistor (HEMT), Gallium Nitride Metal Semiconductor Field Effect Transistor (GaN MESFET), Silicon Carbide Metal Semiconductor Field Effect Transistor (SiC MESFET), BiCMOS, Metal Oxide Semiconductor (MOS), BiFET, and Gallium Arsenide Pseudomorphic (GaAsP) HEMT. These amplifiers have been used in various applications such as Global System for Mobile Communications (GSM), Enhanced data for global evolution (EDGE), successive approximation, analog-to-digital converter (ADC), flash analog-to-digital converter (ADC), comparator, voltage-controlled oscillator (VCO), and mixer circuits. However, existing literature on power amplifiers has identified several issues that need to be addressed. The amplifier structure typically consists of a voltage source, first amplifying unit, and second amplifying unit. The first amplifying unit amplifies the input signals to generate a first amplified signal, while the second amplifying unit amplifies the input signals to generate a second amplified signal. The output signal is then generated based on the first and second amplified signals. An amplifier also includes a biasing unit, amplifying unit, and Schmitt trigger. The biasing unit generates a bias current independent of the power supply to increase power supply rejection ratio. The amplifying unit receives an input voltage and generates an amplified voltage based on the biasing current. The Schmitt trigger generates and outputs a modified voltage. An amplifier circuit consists of a first series circuit, a second series circuit, and an amplifier stage. The first series circuit includes a current source, a first tap, and a first component configured as a diode. The second series circuit includes a controlled path between a first connection and a second connection of a first transistor and a second tap. The amplifier stage is coupled to the second tap to set the operating point of the amplifier stage.
Amplifier in audio system5 answersAudio amplifiers are devices used to increase the amplitude of an audio signal, thereby increasing its loudness when played through speakers. They are an essential component of sound systems and have evolved over time. Class D power amplifiers, such as those based on GaN devices, are becoming popular due to their high power efficiency and fidelity. The audion, developed in the early 20th century, was one of the first amplifiers used for radio signals. Recent advancements include the development of high-fidelity and high-efficiency digital class-D audio power amplifiers, which utilize closed-loop negative feedback and loop-filtering technologies to minimize distortion. Different audio amplifiers, such as LM386, LM358N, and LM3886, have been analyzed for their efficiency and power gain factor. Additionally, there have been efforts to control the power consumption and temperature generated by audio amplifiers using advanced control algorithms and integrated circuits.
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