BB174LXX

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Capacitance @ Vr, F:	2.22pF @ 28V, 1MHz
Capacitance Ratio:	10.9
Capacitance Ratio Condition:	C1/C28
Voltage - Peak Reverse (Max):	30V
Diode Type:	Single
Q @ Vr, F:	--
Operating Temperature:	-55°C ~ 125°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	2-XDFN
Supplier Device Package:	2-DFN1006D (0.6x1.0)

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Variable Capacitance (Varicaps, Varactors)

Introduction

The BB174LXX is a Varicap diode, also known as a varactor or Varactor diode. It is a semiconductor device that functions similarly to a voltage sensitive capacitor. The BB174LXX is applied in various fields for varied purposes, these include: radio frequency applications, broadband systems, surface acoustic wave (SAW) filters, and local oscillators. Its main characteristic feature is its relatively high capacitance-to-voltage ratio, making it an ideal choice for changes in electrical and radio frequency applications.

Application Field

The BB174LXX possesses a wide array of applications, these include radio frequency, surface acoustic wave frequency filters, oscillators, and mixers. The device has a wide range of values for the capacitance-to-voltage and can be used to expand the range of operating frequencies, by allowing small ranges of frequency to be tweaked. Additionally, it is used in mixers and oscillators and can be plugged into crystal oscillators even to increase the power output.

The BB174LXX is particularly useful in radio frequency (RF) applications. It is used extensively in RF devices, particularly in receivers, as the device can be modified to attain the desired frequency. For instance, in amplified television (AMTV) applications, the device can be used to compensate for the amplification of the signal by using capacitance tuning. Additionally, the device is used in AM radio as a tuning element, used to finely adjust the frequency of a radio signal.

Back reflector is also a great application for the BB174LXX. It is used in systems such as radar, LIDAR, and satellite dish pointing. The BB174LXX is able to convert electrical signals the the back reflector, allowing for superior accuracy of the reflector.

Working Principle

The working principle behind the BB174LXX is a relatively simple one. The device is able to control the capacitance of a given circuit, by changing the voltage input to the device. This is done by changing the electric field which extends across the reverse bias terminals of the device. In this way, the altered electric field causes a change in the parasitic capacitance of the device and thus a variation of capacitance in the circuit.

In more technically terms, the BB174LXX works by using two semiconductor layers and their capacitance is remodulated, primarily by altering voltages. The operation is such that when the reverse bias voltage is increased, the junction capacitance decreases and vice versa. The device is designed to convert electrical signals to a voltage which can then be used to alter the capacitance of the junction.

Additionally, the BB174LXX can also affect the impedance of an associated circuit, primarily by employing varactor-induced reactance. The capacitance of the device is able to alter the complex electrical network by affecting the impedance of the circuit.

Conclusion

The BB174LXX is a very applicable device, and is used for a variety of purposes. It is most commonly for use in radio frequency applications, as it allows for small and precise alterations of the frequencies. Additionally, its use can be found in surface acoustic wave filters, oscillators, and mixers, allowing for flexibility and ease in implementation. Finally, it also works by changing the electric field between the two conductor layers and thus influencing changes in capacitance.

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