In some diodes there is a sharp point at which breakdown occurs, very much akin to the curve of a Zener diode, and this is where avalanche breakdown occurs. Also as the voltage on the diode increases, it is likely that specific voltage supplies for the circuits driving the varactor diodes will be required. Some may even operate up to as much as 60 volts, although at the top end of the range comparatively little change in capacitance is seen. Again a good margin should be left to accommodate variations in the parameters between devices.ĭiodes typically operate with reverse bias ranging from around a couple of volts up to 20 volts or possibly higher.
#VARACTOR DIODE DATASHEET DRIVER#
It is also necessary to ensure that the minimum capacitance specification is achievable with the maximum driver voltage. By ensuring there is sufficient margin, the circuit is less likely to fail.
the rail voltage of the driver circuit, and the reverse breakdown voltage of the diode in the specification datasheet. In view of the high voltages that may need to be applied, it is wise to choose a varactor diode that has a margin between the maximum voltage it is likely to expect, i.e. Typical voltage capacitance curve for a varactor diode To achieve the required minimum capacitance and the overall capacitance range it may be necessary to apply some relatively high voltages. The capacitance decreases with increasing reverse bias, although as voltages become higher the decrease in capacitance becomes smaller. The reverse breakdown voltage, V B of a varactor diode is an important specification because the voltages which can be used to drive these diodes to provide the required range of capacitance can be quite high in some instances. However there are several other specifications that are unique to the operation of the varactor diode.Īs the varactor requirements can be a balance between several competing factors it is necessary to understand the specifications and what they mean. In view of the fact that the varactor diode is a semiconductor diode, many parameters are the same as those of other diodes. When choosing a varactor diode from the information on the datasheet, the varactor specifications need to be carefully assessed to see whether its performance meets the needs for the circuit in which it is intended for uses. Varactor / varicap Abrupt & hyperabrupt varactors Varactor specifications (datasheet) Varactor diode circuits Varactor / Varicap Diode Tutorial Includes: Understanding Varactor Diode Specifications: specs & parameters Key specifications and parameters for defining the performance ofvaractor diodes or varicap diodes: Q, reverse voltage, capacitance range, etc.
0 kommentar(er)
