BB135,135

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Diodes, also known as variable capacitance (varicaps, varactors) are transistors used in electrical engineering to control and vary the strength of an electronic signal through a variable capacitance. They consist of a semiconductor material sandwiched between a pair of conductive electrodes, which act as a diode for the current passing through it. The diode\'s capacitance is determined by the applied voltage, and it operates on the principle of varying the capacitance of the diode in accordance. A variable capacitance diode (aka varicap or varactor) is an efficient device used for tuning or frequency selection in electronic circuits.

The BB135 is a variable capacitance diode produced by Semiconductor Corporation. It is a PN junction assembly, which is made up of a silicon junction beneith a pair of electrodes. It is the ideal choise for tuning and frequency selections applications requiring high quality distortions free voltage and good stability over frequency range. It produces good stability to temperature and amplitude, minimum noise, and fast switching times. The BB135 has a maximum capacitance of 350pF(min) and a capacitance variation ratio at 0.5V of up to 35%. The diode prevents reverse currents and provides reverse voltage protection of up to 125V.

In practical applications, the BB135 is used in various electronic designs and circuits such as amplitude modulators, tunable oscillators, and frequency doubler circuits. It can be used to produce high quality tone controls, automatic frequency control systems and RF wideband filters for communications. The diode also finds application in voltage controlled oscillators and filters, wideband AM radio receiver demodulators, phase-locked loops and FM radio receiver demodulators. The BB135 is useful in acoustic applications such as audio notch filters and acoustic equalizers.

The working principle of BB135 diode is based on the principle of providing a variable capacitance by maintaining a constant electric field across two electrodes sandwiching a semi-conductor material. When a positive bias is applied to the diode, the depletion region (also known as the depletion layer) between the two electrodes widens due to the electric field created by the voltage difference, thus increasing the capacitance. Conversely, when a negative bias is applied, the depletion layer shrinks, reducing the capacitance. The ratio of the capacitance variation when the bias voltage is changed from 0V to 0.5V is used to quantify the device\'s performance, which in the case of the BB135 is up to 35%.

In conclusion, the BB135 diode is a reliable and convenient device for use in various electronic circuits requiring wide frequency tuning and frequency selections. It operates on the principle of varying the capacitance of the diode in accordance with the applied voltage and provides reverse voltage protection of up to 125V. The BB135 produces distortions free voltage and good stability over wide frequency range, and is thus used in various applications including wideband AM radio receivers, FM radio receivers, acoustic applications, automatic frequency control systems and voltage controlled oscillators.

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