An analytical formula for the power gain in the OHC's parametric amplifier has been developed. The proposed model has direct physical interpretation and all its elements have their physical counterparts in the actual structure of the cochlea. The numerical values of the individual elements of the ...
Efficiency h of an amplifier is defined as the ratio of ac output power power delivered to load to dc input power . By formula : As we will see, certain amplifier configurations have much higher efficiency ratings than others. This is primary consideration when deciding which type of power ...
Use 1% tolerance or better gain-setting resistors if not using input coupling capacitors. In the single-ended input application an input capacitor, CI, is required to allow the amplifier to bias the input signal to the proper dc level. In this case, CI and RI form a high-pass filter ...
The power level of a signal output for transmission is affected by adjusting the signal amplitude input to an RF amplifier with the TPC signal using a pre-driver stage, a variable gain amplifier, an attenuator or the like. However, the gain and bias of the amplifier remain fixed. Therefore...
Gain, resonance frequency, bandwidth are parameters that characterize the performance of an antenna. Assuming an unobstructed space and isotropic transmitting source, the spreading of the waves in all directions is uniform. Thus, the power per unit area at a distance from the source is inversely pr...
The circuit approximates switch action by varying the transconductance of an amplifier, the maximum gain of which is unity. At low transconductance, amplifier gain is nearly zero, and essentially no signal is passed. At maximum transconductance, signal passes at unity gain. The amplifier and its ...
The slave amplifier is a unity gain buffer. Thus, the output voltages of the two amplifiers are equal. If the two sense resistors connected to the load are equal, the amplifiers share current equally. More slaves may be added as desired. The additional resistor and capacitor on the slave ...
This article presents a new broadband three-way series Doherty power amplifier (DPA) topology, which enables a broadband output power back-off (OBO) efficiency enhancement of up to 10 dB or higher. The proposed DPA topology achieves Doherty load modulation and three-way power combining through a...
Class D power amplifiers, one of the most critical devices for application in sound systems, face severe challenges due to the increasing requirement of smartphones, digital television, digital sound, and other terminals. The audio power amplifier has de
Voltage and current can be amplified. The strange term "power amplifier" has become understood to mean an amplifier that is intended to drive a load such as a loudspeaker. We call the product of current gain and voltage gain "power amplification". ...