The circuit further comprises a tunable frequency generator and a spectrum analyzer, the circuit being tunable to allow a resonant frequency.

The clock signal (CLK) at the clock input (14) of the comparison signal device (10) can be derived from said oscillator signal (OSC).

A frequency-hopping arrangement comprises a basic-frequency branch (DIVl), an offset-frequency branch (DIV2, DIV3, SCC), and a controllable frequency converter (SBM, FSC).

This was a digitally tunable frequency-hopping RF filter.

The transform kernal includes a positive scaling factor and a frequency modulation parameter and provides an adjustable time-frequency window based on the positive scaling factor and frequency modulation parameter.

The refrigerating compressor unit (1) is mounted an adjustable frequency motor (1A) and a compressor (1B) with magnetic suspend bearings.

An adjustable frequency oscillator with a wide tuning range which can be voltage or current controlled.

Moreover, there is provision to shoot auto-continuous imaging with adjustable frequency.

An oscillator (100, 200) and a method of adjusting the frequency of oscillation of the oscillator (100, 200) are disclosed for generating a signal with an adjustable frequency in a frequency range from 1GHz to 200GHz.

The fine tuning loop may receive a reference signal at a reference frequency and generate a fine tuning signal at a first frequency adjustable in fine steps.

Each primary winding is driven by it’s own separate oscillator which has adjustable frequency and adjustable Mark/Space ratio, or “Duty Cycle”.

The set of generators of luminous flux is embodied in the form of a set of monochromatic lasers or in the form of a set of variable frequency lasers.

An adjustable frequency drive (10) including a number of power modules (14) and a heat management system (16) is provided.

In another embodiment the optical system includes an interferometer in optical communication with the external-cavity frequency-tuned laser.

The adjustable frequency converter (AFRC) and the filter arrangement (FIL) may form part of an integrated receiver-circuit (IRC) suitable for many different transmission standards.