Sabtu, 06 Agustus 2011

Step Recovery Diode (SRD)

Diodes are one of passive electronic components. Diodes have two pole pieces of leg and foot anode cathode. Diodes made ​​from semi-conductor type P and N type semi-conductors that are connected together.

Due to the nature of the diode that works as a conductor if we give forward bias and works as an insulator in reverse bias, then .. often used as a rectifier diode (rectifier) alternating current. Examples of its use is on the circuit adapter, DC power supply (Power Supply DC) and so on.

To determine the diode is in good condition or damaged we can measure it using a multimeter or ohmmeter. Because nature is only able to drain diode direct current only, the installation of the multimeter to the diode must be done as follows:
Positive terminal (+) multimeter in diode cathode connected to the leg.
Negative terminal (-) multimeter diode anode connected to the leg.

Step Recovery Diodes have relatively little capacitance change under reverse bias and are used for higher efficiency applications. These diodes do not require idler circuits to enhance efficiency. The use of these diodes results in:
High Efficiency
High and Low Order Multiplication
Narrow Bandwidth
Comb Generation

Absolute Maximum Ratings
Storage Temperature: -65C to +200C
Operating Temperature: -65C to + 175C

Step Recovery Diode (SRD) has long been used to build high order frequency multiplier circuits. An approximate design procedure for the SRD frequency multiplier can be found in Hewlett Packard application note 920.

While this 1960's era technology is still in fairly wide use, there's still no other computer program to aid in the design process and no nonlinear model of a true SRD known to the author. At least one manufacturer of step recovery diodes does publish approximate SPICE models of their parts, though SPICE cannot represent the diode's transition time.

Step-Recovery Diodes By reducing the doping level near the junction of the plant can make the step-recovery diode devices that use charge storage. During the forward conduction diodes behave as usual and when dibias diode reverse diode conduction while the layer is being set up and then emptying all of a sudden reverse flow becomes zero. In these circumstances as if the diode suddenly snapped open (snaps open) such as switches, and this is why the step-recovery diode is often called the snap diode. Step-recovery diodes are used in pulse and digital circuits to produce a very rapid pulse. Snap-off that suddenly can result in switching on-off less than 1 ns. This particular diode is also used in frequency multipliers.

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