1SV311(TPH3,F) Discrete Semiconductor Products

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Variable capacitance diodes, also known as varicaps, varactors and var regulators, are four layer, semiconductor diodes which present capacitance varying with the reverse bias voltage applied to the junction. 1SV311(TPH3,F) is a type of low-capacitance varicaps and is used for intermediate frequency (IF) tuning and signal level control in receivers, transmitters and TV sets.

The working principle of 1SV311(TPH3,F) is based on a diode structure with a third junction formed by using a folded PN junction. This third junction presents a junction capacitance which is essentially dependent on the reverse bias voltage across the third junction. Varying the voltage alters the capacitance which in turn controls the transfer of electronic signals. This feature makes the varicap applicable to tune ceramic resonators and crystals to specific frequencies.

The variable capacitance function is the most important fact of 1SV311(TPH3,F). Since it is an ideal variable resistor, the varicap can be used to modulate frequency of the IF part of television and radio receivers, and to modulate FM sound carrier frequency in television sets. Additionally, this device can also be utilized in an oscillator to adjust frequency. In some TV sets, the varicap is utilized as an AGC (automatic gain control) circuit.

Other application fields of 1SV311(TPH3,F) include medical equipments. It is used as an automatic-gain-control diode pinch-off regulator in the lowest-noise stages of medical ultrasounds. The device can also be used in oscillator-tuning circuits for sonography and some other applications though such uses require DC-insensitivity.

The self-capacitance of 1SV311(TPH3,F) may also be utilized at times. The self-capacitance is an AC capacitance which may be applicable to some oscillator circuits, filter circuits, and stability-resistor/capacitor circuits. It is also possible to use the varicaps in addition to other components when building circuits that need both resistors and capacitors for improved performances.

High-capacitance varicaps can also be used as voltage multipliers. A voltage multiplier is a DC circuit that produces an output voltage which is high in relation to the input voltage. The basic operating principle of a voltage multiplier is to use a device, such as a varicap, to collect the charge from a capacitor diode and create an oscillator with two diodes and a capacitor. Variations of this circuit are often used in AC powered power supplies to produce multiple voltages as an output.

1SV311(TPH3,F) variable capacitance diodes have a much better temperature stability than other types of variable capacitance diodes. It can also achieve good tolerance and a higher capacitance range than other low-capacitance varicaps. This makes 1SV311(TPH3,F) a useful component when the precision and temperature stability of the output is of great importance. It is therefore a very valuable component in many receivers, transmitters and TV sets for intermediate frequency (IF) tuning and signal level control.

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