A precision diode is a diode with 0V (or near 0V) voltage drop when forward biased, unlike a normal diode which has a finite forward voltage drop of typically 0.2 to 0.8V depending on diode technology.
It is typically implemented with an Operational Amplifier that has a normal diode somewhere in it's feedback path. The circuit utilizes the gain of the Op-Amp to compensate for the finite voltage drop of the diode. Several variations of the implementation exists.
Some applications for precision diodes are
A simple rectifier circuit uses a diode and there is a turn ON voltage for the diode. The input voltage has to exceed the turn ON voltage (0.6V for ordinary Si diode) before rectification is achieved. A precision rectifier is an active circuit using an opamp and a diode in the feedback loop. This overcomes the turn-on "knee" voltage. The op amp reduces the turn-on voltage of a diode in its feedback loop by a factor equal to the open-loop gain of the op amp. For practical op amp gains this reduces the forward voltage to a fraction of a mV, thus giving a "precision" or near ideal diode characteristic for the rectifier function.
zener diode :zener diode operates under reverse bias voltageideal diode :ideal diode operates under forward bias voltage
yes, diode can be used as rectifier diode to convert ac to dc
zener resistance of a zener diode is the resistance of the zener diode but which is the resistance of a diode
silicon diode is preferred more when compared with germanium diode because in silicon diode the operating voltage is 0.7v where as in germanium diode the operating voltage is 0.3v , germanium is temperature sensitive so it can be easily destroyed by increasing temperature hence silicon diode is preferred more
A simple rectifier circuit uses a diode and there is a turn ON voltage for the diode. The input voltage has to exceed the turn ON voltage (0.6V for ordinary Si diode) before rectification is achieved. A precision rectifier is an active circuit using an opamp and a diode in the feedback loop. This overcomes the turn-on "knee" voltage. The op amp reduces the turn-on voltage of a diode in its feedback loop by a factor equal to the open-loop gain of the op amp. For practical op amp gains this reduces the forward voltage to a fraction of a mV, thus giving a "precision" or near ideal diode characteristic for the rectifier function.
zener diode :zener diode operates under reverse bias voltageideal diode :ideal diode operates under forward bias voltage
yes, diode can be used as rectifier diode to convert ac to dc
Laser diode
The read type diode are called impatt diode
A diode is used primarily as a Rectifier
zener resistance of a zener diode is the resistance of the zener diode but which is the resistance of a diode
Laser diode
A light Emitting Diode.... Light Resistat Diode ...
Diode for what?
In a rectifier made of just diodes, the diodes have a voltage drop, resulting in a lower DC output voltage. By introducing an Op-amp, this voltage drop can be overcome. Since there is no voltage drop caused by the diodes, the rectified signal is not changed by the rectifier, so it is called a precision rectifier.
Zener diode is heavily doped pn junction diode.