varactor diode

The varicap or varactor diode is used in many appliances.

A varactor diode is specifically designed for this purpose.

Figure 1 shows a direct frequency modulator which uses a varactor diode.

Varactor diodes are symmetrically introduced, which results in dynamic tunability for the whole structure.

The tuning necessary to select different stations is done by varactor diodes across the Lecher line.

A varactor diode's capacitance is controlled by the voltage across the diode.

A varactor diode acts like a variable:

This is due to several factors, but the primary restriction is the limited capacitance range of varactor diodes.

Using simple tools, you can just reduce to audio to the varactor diode to about the half of the setting as adjusted for VHF.

Special-purpose variable capacitance varactor diodes are available with well-characterized wide-ranging values of capacitance.

The oscillation frequency was controlled by the bias voltage, Vb, applied to a varactor diode (SMV770).

The system enabled tuning to be made using just one single variable capacitance (using a single varactor diode) hence avoiding tracking problems.

The voltage used to bias the varactor diodes in modern tuners is often derived from the LOPT.

Radio frequency VCOs are usually made by adding a varactor diode to the tuned circuit or resonator in an oscillator circuit.

The classical varactor parametric oscillator consists of a semiconductor varactor diode connected to a resonant circuit or cavity resonator.

A later method used a potentiometer supplying a variable voltage to varactor diodes in the local oscillator and tank circuits of front end tuner, for electronic tuning.

The early paramps varied inductances, but other methods have been developed since, e.g., the varactor diodes, klystron tubes, Josephson junctions and optical methods.

Since a varactor diode has only two connections, it can only be a part of an LC network with four eigenvectors with nodes at the connections.

The heterostructure barrier varactor (HBV) is a semiconductor device which shows a variable capacitance with voltage bias, similar to a varactor diode.

Studies have examined the ability to control the response of individual particles using tunable devices such as varactor diodes, semiconductor materials, and barium strontium titanate (BST) thin films.

By introducing a varactor diode as a nonlinear element within each resonator, the frequency of the electric mode stop band is shifted by changing the incident power without affecting the magnetic response.

I. T. Ho and A. E. Siegman, "Passive phase-distortionless parametric limiting with varactor diodes," IRE Trans.

Polarization and radiation pattern reconfigurability, and frequency tunability, are usually achieved by incorporation of III-V semiconductor components, such as SPST switches or varactor diodes.

In September 1961, using an infrared image converter microscope recently brought in from Japan, they discovered all of the GaAs varactor diodes and tunnel diodes they had manufactured at the time emitted light.

Later electronic types utilized the varactor diode as a voltage controlled capacitance in the tuned circuit, to receive a number of preset voltages from the rack of buttons tuning the device instantly to local stations.