ZMV834BTA Discrete Semiconductor Products

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Variable capacitance diodes, known as varicaps or varactors, are diodes whose capacitance depends on the voltage across the junction. It has excellent dynamic characteristics, low cost and wide band of operation, making them attractive for use in amateur radio, RF sensing, high speed switching and automatic gain control. ZMV834BTA is a typical varicap diode which provides high capacitance at low voltages and is suitable for use in AM, FM and switching circuits.

Balanced diode – ZMV834BTA

The ZMV834BTA is a balanced varicap diode, which contains two PN junctions in the same package with equal capacitance and opposite polarities. The capacitance of each diode is equal, with the total capacitance being equal to the sum of the two individual diodes. The varicap diode is ideal for use in balanced varicap systems with small signal levels. The ZMV834BTA offers an easy way to adjust tuning characteristics in circuits.

Features

• Bidirectional capacitance characteristics
• Very small capacitance shift with temperature change
• Low distortion and high isolation
• High reliability
• Available in leads-in-glass
• Compatible with automated equipments

Application Field

The ZMV834BTA is a high performance balanced varicap diode, which is commonly used in various radio applications such as AM, FM, and switching circuits as well as in television and communication systems for frequency control and tuning. The device is suitable for high-speed automatic frequency control, precision tuning, and switching circuits. Additionally, it can be used for RF sensing for inductance-capacitance (LC) oscillator tuning circuits and automatic gain control, wideband frequency modulation, industrial measurement, and communications applications.

Working Principle

The variable capacitance of varicaps is due to the tunneling effect, which occurs when electrons tunnel through the barrier of the varicap at low voltages and higher voltages, respectively. The gate-source voltage will affect the p-n junction’s tunneling effect and cause an increase or decrease in the ratio of the junction’s capacitance to the total depletion width. The varicap’s junction capacitance is inversely proportional to the gate-source applied voltage. This means that it will decrease when the voltage is increased and vice versa.

For ZMV834BTA, its capacitance ranges from 3.5 to 7.5 pF with a reverse voltage of 0.6V. It features a low capacitance shift with temperature variation due to its constant depletion width, making it ideal for use in precision circuitry. Moreover, the balanced varicap has low distortion and high isolation, making it suitable for radio applications with high signal levels such as FM and AM.

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