Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Q. Frequency response of amplifiers?
All amplifiers exhibit variations of performance as the signal frequency is changed. The frequency response of an amplifier may be defined as the functional dependence of output amplitude and phase upon frequency, for all frequencies. Invariably there is a maximum frequency above which amplification does not occur. Depending on the design of the circuit, there may also be a lower frequency limit below which amplification disappears. The range of frequencies over which significant amplification of themagnitude is obtained is known as the passband, which is bounded by the upper cutoff frequency and the lower cutoff frequency (if one exists).Dc-coupled amplifiers, in which the stages are coupled together for all frequencies down to zero, have no low-frequency limit. On the other hand, circuits containing coupling capacitors that couple stages together for ac while isolating them for dc are limited in their low-frequency response. The high-frequency deterioration of the voltage gain is due to the effect of capacitances that are internal to the transistor.
Figure shows a typical frequency response of a voltage amplifier.While most often the magnitude of the gain is discussed (because it defines the frequency range of useful gain), the phase response becomes important for transient calculations. The midband region is the range of frequencies where gain is nearly constant. Amplifiers are normally considered to operate in this useful midband region. The bandwidth of an amplifier is customarily defined as the band between two frequencies, denoted by ωH and ωL, which corresponds to the gain falling to 3 dB below the midband constant gain. Thus,
W3dB = ωH - ωL
which is shown in Figure. When both ωL and ωH have significant values, the amplifier is known as a bandpass amplifier. A narrow-bandpass amplifier is one in which W3dB is small relative to the center frequency of the midband region. In a low-pass unit (dc amplifier) there is no low 3-dB frequency.
Lack of Accountability - High Technical Usage In huge, complex and widespread ST&D networks such as ours, the subsequent factors pose problems in arriving at reasonable estima
Constant Frequency System In this system chopping period T is kept constant but the on time T om is varied. This system is also referred to pulse with modulation or time
compound generator drawback
Voltage regulator: A voltage regulator is an electrical regulator intended to automatically keep a constant voltage level. A voltage regulator is an instance of a negative fee
Q. Find load resistance and voltage? Let the amplifier block be connected to a current source at the input terminals, as shown in Figure(a), and to a load resistance R L at it
Q. What do you mean by Transconductance? The control that the gate voltage has over the drain current is measured by transconductance and is similar to the transconductance of
what is FPGA ..
Q. Write short notes on the Stability Factor of Biasing circuits. The degree of success achieved in stabilizing Ic in the face of variations in Ico is expressed in terms of sta
Q. Adiodewith the i-v characteristic shown in Figure is used in series with a voltage source of 5 V (forward bias) and a load resistance of 1 k. (a) Determine the current and t
Estimate the software tasks required for developing the product. These are likely to include the development of various software routines, associated documentation and verification
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd