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Is it possible that an amplifier without feedback may oscillate at high frequency?
Wiki User
∙ 14y ago
it all depends on its open loop gain or crossing the zero db point at slope less the -1db
Wiki User
∙ 14y ago
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Why negative feedback is preferred in amplifier?
Because the feedback of an amplifier tends to reduce the gain of an amplifier and also, the bandwidth of feedback increases the gain of an amplifier, so in an high gain amplifier as to be stabilized. BY ENGINEER MUHAMMED OLALEYE OLUWATOSIN TELECOMMUNICATION STUDENT, RUFUS GIWA POLYTECHNIC, OWO
How a triode valve can be used as an oscillator?
An amplifier can be made into an oscillator by feeding back part of the output to the input. A simple oscillator uses a Frequency Determining Network (FDN) in the feedback path to give a predictable frequency of oscillation. There are some simple requirements - the valve must be capable of operating at the desired frequency, and the total gain (loop gain) from output to input must be at least unity. Many oscillators use tuned inductive-capacitive circuits, but it's also possible to use a resistive-capacitive circuit, or a quartz crystal as the FDN.
Is it possible to change the frequency in an electrical substation?
yes, it is possible to change the frequency in substations. frequency changer is a motor-generator set that changes power of an alternating current system from one frequency to one or more different frequencies, with or without a change in the number of phases, or in voltage. Sometimes a converter is used to accomplish this.
Advantages of parametric amplifier over microwave amplifier?
Microwave and audio parametric amplifiers were used as low-noise amplifiers, to process low-level signals. Therefore their non-linearity probably never occurred in use. In principle, Manley-Rowe theory holds for any frequency combination, and should apply also in optics. I am not aware about the application in optics but it is clearly possible. In optical spectrum (frequencies above IR), however, quantum noise prevails above thermal noise, so low-noise amplification is usually not needed or not possible.
What can be used as an amplifier?
Lots of things can be amplifiers. They can be as simple as a single transistor. Picking an amplifier requires a bit of system knowledge. What's the signal to be amplified? What is the output delivered to? Should the "DC" bias levels be decoupled? Here's an example: An audio amplifier is typically a voltage-in, power-out device. So, the input should have high impedance, while the output has low impedance. The device should be powerful enough to handle large currents and power levels. A radio-frequency amplifier is typically power-in, power-out (with impedances matched to 50 Ohms to avoid signal reflection). A typical blood glucose sensor typically has a current output. So, connecting it to a microcontroller and displaying the result would require a current-to-voltage amplifier. For most of these applications, it is possible to adapt an operational amplifier to create the desired amplification (trans-impedance, trans-conductance, etc.). Sometimes, when higher performance is required, it's necessary to build a circuit using OTA's (operational transconductance amplifiers) and transistors (common-source, common-emitter, common-base, mirrors, folded cascodes, etc). It's usually easier to find a special-purpose one to buy (e.g., buy an audio amp, or a RF amp, or an instrumentation amp, etc from Digikey). Hope this helps!
Why negative feedback is preferred in amplifier?
Because the feedback of an amplifier tends to reduce the gain of an amplifier and also, the bandwidth of feedback increases the gain of an amplifier, so in an high gain amplifier as to be stabilized. BY ENGINEER MUHAMMED OLALEYE OLUWATOSIN TELECOMMUNICATION STUDENT, RUFUS GIWA POLYTECHNIC, OWO
What does feedback do?
The purpose of negative feedback in electronic amplifier circuits is to make the performance of the circuit depend as far as possible on well defined passive components like resistors and fixed capacitors, and not on the active devices which have a less well defined performance.
What is the use of oscillators?
Trasmitting stations have their own transmitting frequency. No one can construct an amplifier which amplifies signals over a wide range. So every transmitting frequency has to be changed to one particular frequency. This is known as INTERMEDIATE frequency (IF) This is quite possible by getting beats. So a signal is to generated whose frequency is just more than the incoming frequency by IF This signal is named as local singnal which is generated by the LOCAL oscillator.
What are possible consequences of inadequate feedback?
The possible consequences of inadequate feedback is not knowing where to make improvements. Feedback gives a person or company knowledge of areas they can improve in.
Is feedback possible?
yes
How a triode valve can be used as an oscillator?
An amplifier can be made into an oscillator by feeding back part of the output to the input. A simple oscillator uses a Frequency Determining Network (FDN) in the feedback path to give a predictable frequency of oscillation. There are some simple requirements - the valve must be capable of operating at the desired frequency, and the total gain (loop gain) from output to input must be at least unity. Many oscillators use tuned inductive-capacitive circuits, but it's also possible to use a resistive-capacitive circuit, or a quartz crystal as the FDN.
What is the use of local oscillator?
Trasmitting stations have their own transmitting frequency. No one can construct an amplifier which amplifies signals over a wide range. So every transmitting frequency has to be changed to one particular frequency. This is known as INTERMEDIATE frequency (IF) This is quite possible by getting beats. So a signal is to generated whose frequency is just more than the incoming frequency by IF This signal is named as local singnal which is generated by the LOCAL oscillator.
How can you use a piezo disc to temporarily close a circuit?
by itself no. but by using amplifier it is possible
What is simple frequency distribution table?
The frequency distribution table lists all the possible events and how many times (frequency) they occurred.
How do you correct feedback noise in the car stereo?
A loud "squeal" or "screech" - also known as "feedback noise" - is usually only generated if there is an audio input device for an amplifier, for example a microphone, that is being used too close to an audio output device for the same amplifier, for example a speaker. So maybe a device which has a microphone built into it - such as a mobile phone - was being used with a loudspeaker connection to the car stereo? It might be possible for someone else to give you a better answer than this one if this question could be edited to say what other devices are being used near to the car stereo.
Is relative frequency similar to the concept of probability?
The relative frequency of of an event is one possible measure of its probability.
Why should 1 MHz crystal Oscillator oscillates at a frequency other than 1 MHz?
Heat variances will cause the frequency to oscillate up and down in a rather dramatic way sometimes. Other possible crystal problems are manufacturing/quality-control error, aging, or vibration. Also, the oscillator circuitry can cause the frequency to vary. Crystal manufacturers specify circuit capacitance and circuit resistance values that must be used for correct operation. Incorrect circuitry can also set up unwanted overtone resonances or spurious frequencies.
