BB153,135

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A varactor or varicap diode is a special type of diode designed specifically to work as a voltage-controlled capacitance. It is a three-terminal device in which two terminals are anode and cathode, and the third terminal is a gate. Varactors are used in many applications such as radio receivers, analog-to-digital converters and tuning resonant circuit elements. BB153,135 is one type of varactor diodes which is widely used in many applications. This article will discuss the application field and working principle of BB153,135.

BB153,135 is a commonly used varacter diode. It is a wideband low power voltage-variable device used in RF tuning circuits. BB153,135 is a silicon semiconductor which can be biased to vary the capacitance one order of magnitude. The junction capacitance can be varied eight times by applying reverse bias voltage to adjust the capacitance of the diode. BB153,135 has an extremely high linearity between the biases voltage and capacitance variation. It has excellent instantaneous capacitance tracking response which makes the device fit for wideband tuning applications.

BB153,135 can be used in various applications, such as television, stereo receivers, FM tuners, filters, antennas and measurement applications. Television can use varicap diodes as main tuning elements. The most common application of the diode is to tune thereception frequency of television, radio and other receivers. Varactors are used to tune the resonant frequency of tank circuits in FM tuners, antennas and radio receivers. Varactors also offer a good linear tuning of resonant circuits due to its high linearity between bias voltage and capacitance variation. Furthermore, BB153,135 can be used for IF Filtering in stereo receivers, FM systems and other measurement applications.

The working principle of BB153,135 is based upon the depletion region capacitance. The diode is made of a P-type and N-type silicon semiconductor junction. When a reverse bias is applied to the gate or third terminal, the depletion region width of that junction changes depending on the gate voltage. The gate voltage controls the depletion width and hence the capacitance of the diode. This voltage-variable capacitive effect of the P-N junction in a semiconductor diode is used for creating varicaps for RF tuning applications. This device can also be used for RF amplifiers and oscillators.

The gate voltage of BB153,135 is of utmost importance. The diode has a low power rating which requires the gate voltage to stay within its voltage rating. BB153,135 cannot handle high voltage or high current and the voltage rating should not be exceeded to avoid any unnecessary damage or catastrophic failure.

In conclusion, BB153,135 is a commonly used varicap or varactor diode which is used in various applications. It has an extremely high linearity between the bias voltage and capacitance variation which makes it suitable for widely tunning applications such as television, stereo receivers, FM tuners, filters, antennas and measurement applications. The working principle of BB153,135 is based upon the depletion region capacitance which varies the capacitance of the diode. It is important to stay within its voltage rating to avoid damage or catastrophic failure.

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