BB148,135

The BB148 and BB135 are two models of variable capacitance diodes, also known as Varicaps, or Varactors. This type of diode is specifically designed to produce a varying capacitance with respect to a control voltage. This makes them very useful in many different applications.

The basic internal structure of the BB148 and BB135 are similar. The main difference is that the BB148 has an additional anode contact, allowing it to be used in a single-ended or differential configuration. The advantage of the BB148 is its extremely low leakage current.

The basic operating principle of a variable capacitance diode is based on the effect of the reverse-biased voltage on the depletion region. The voltage causes the width of the depletion region to change, resulting in a change in the capacitance of the diode. This change in capacitance can be used to control the characteristics of an electronic circuit.

These diodes can be used in a variety of circuit configurations. Some examples include auto-zeroing circuits, frequency tuning circuits, automatic gain control circuits, and amplitude modulation circuits. They are also used in many RF and microwave applications, such as mixers, oscillators, and frequency multipliers.

The BB148 and the BB135 are widely used in the industry, due to their low leakage current, low cost, and reliable performance. As a result, they are used in a variety of applications, including consumer electronics, automotive, and industrial control systems.

In conclusion, the BB148 and BB135 are two models of variable capacitance diodes, or Varicaps, or Varactors. These diodes are specifically designed to produce a varying capacitance with respect to a control voltage. They are widely used in the industry, due to their low leakage current, low cost, and reliable performance. As a result, they are used in a variety of applications, including consumer electronics, automotive, and industrial control systems.

The use of these diodes in electronic circuits allows for precision tuning and control, making them a vital component for many different applications.