Wide frequency deviation voltage controlled crystal oscillator having plural parallel crystals

A wide frequency deviation oscillator for providing an output signal throughout a continuous range of frequencies, said oscillator comprising:

• a crystal or ceramic bandpass filter, said bandpass filter containing a plurality of crystal or ceramic resonators and a plurality of parallel conduction paths, one of said crystal or ceramic resonators being connected in each of said parallel conduction paths;
• a phase shifting means;
• and
• an amplifier;
• said bandpass filter, said phase shifting means and said amplifier being connected in series in a loop, said oscillator not containing an inductive element in parallel with said parallel conduction paths;
• said oscillator providing an output throughout said continuous range of frequencies.

A method of generating an oscillating voltage signal within a continuous range of frequencies, said method comprising the steps of:

• providing a plurality of parallel conduction paths, each of said conduction paths containing a crystal, each of said conduction paths having a resonant frequency, said resonant frequencies differing from one another by selected intervals and each of said resonant frequencies lying within said continuous range of frequencies;
• connecting said parallel conduction paths in a series loop with a phase shifting means;
• and
• applying a supply voltage to said loop.

A method of generating an oscillating voltage signal within a continuous range of frequencies, said method comprising the steps of:

• providing a multiple section crystal bandpass filter, said bandpass filter comprising a plurality of crystals, each of said crystals having a resonant frequency, said resonant frequencies differing from one another by one or more selected intervals and each of said resonant frequencies lying within said continuous range of frequencies;
• connecting said multiple section crystal bandpass filter in a series loop with a phase shifting means;
• and
• applying a supply voltage to said loop.

A method of generating an oscillating voltage signal within a continuous range of frequencies, said method comprising the steps of:

• providing a multiple section ceramic bandpass filter, said bandpass filter comprising a plurality of ceramic resonators, each of said ceramic resonators having a resonant frequency, said resonant frequencies differing from one another by one or more selected intervals and each of said resonant frequencies lying within said continuous range of frequencies;
• connecting said multiple section ceramic bandpass filter in a series loop with a phase shifting means;
• and
• applying a supply voltage to said loop.

A method of perpetuating an oscillating signal, said oscillating signal being at a frequency within a continuous range of frequencies, said method comprising the steps of:

• providing a plurality of parallel conduction paths, each of said conduction paths comprising a crystal, a resistor an a capacitor, each of said conduction paths having a resonant frequency, said resonant frequencies differing form one another by one or more selected intervals and each of said resonant frequencies lying within said continuous range of frequencies;
• connecting one end of each of said conduction paths to an input terminal of a summing amplifier;
• and
• supplying said oscillating signal to the other end of each of said conduction paths.

A wide frequency deviation oscillator for providing an output signal within a continuous range of frequencies, said oscillator comprising:

• an amplifier;
• a phase shifting means;
• and
• a multiple-section crystal or ceramic bandpass filter, said multiple-section bandpass filter containing a plurality of crystal or ceramic resonators;
• said amplifier, said phase shifting means, and said bandpass filter being connected in series in a loop.

A wide frequency deviation oscillator comprising:

• an amplifier;
• a phase shifting means;
• and
• a multiple section crystal or ceramic bandpass filter, said multiple section bandpass filter containing N crystal or ceramic elements and N parallel conduction paths, one of said crystal or ceramic elements being connected in each of said parallel conduction paths, each of said conduction paths having a resonant frequency, said resonant frequencies differing from one another by one or more selected intervals within a range of frequencies;
• wherein said amplifier, said phase shifting means and said bandpass filter are connected in series in a loop and wherein each of said crystal or ceramic elements has substantially the same resonant frequency and at least N-1 of said conduction paths contain a capacitive means connected to the crystal or ceramic element in said conduction path to form a combination with said crystal or ceramic element.

A wide frequency deviation oscillator comprising:

• an amplifier;
• a phase shifting means;
• and
• a multiple section crystal or ceramic bandpass filter, said multiple section bandpass filter containing a plurality of crystal or ceramic elements and a plurality of parallel conduction paths, one of said crystal or ceramic elements being connected in each of said parallel conduction paths, each of said conduction paths having a resonant frequency, said resonant frequencies differing from one another by one or more selected intervals within a range of frequencies;
• wherein said amplifier, said phase shifting means and said bandpass filter are connected in series in a loop and wherein each of said parallel conduction paths includes a driving transistor for driving the crystal or ceramic element in said conduction path.

A wide frequency deviation oscillator comprising:

• an amplifier;
• a phase shifting means;
• and
• a multiple section crystal or ceramic bandpass filter, said multiple section bandpass filter containing a plurality of crystal or ceramic elements and a plurality of parallel conduction paths, one of said crystal or ceramic elements being connected in each of said parallel conduction paths, each of said conduction paths having a resonant frequency, said resonant frequencies differing from one another by one or more selected intervals within a range of frequencies;
• wherein said amplifier, said phase shifting means and said bandpass filter are connected in series in a loop and wherein each of said parallel conduction paths includes a summing transistor.

A wide frequency deviation oscillator comprising:

• an amplifier;
• a phase shifting means;
• and
• a multiple section crystal or ceramic bandpass filter, said multiple section bandpass filter containing a plurality of crystal or ceramic elements and a plurality of parallel conduction paths, one of said crystal or ceramic elements being connected in each of said parallel conduction paths, each of said conduction paths having a resonant frequency, said resonant frequencies differing from one another by one or more selected intervals within a range of frequencies;
• wherein said amplifier, said phase shifting means and said bandpass filter are connected in series in a loop and wherein said conduction paths share a common driving transistor for driving said crystals and a common summing transistor.

A wide frequency deviation oscillator comprising:

• an amplifier;
• a phase shifting means;
• and
• a multiple section crystal or ceramic bandpass filter, said multiple section bandpass filter containing a plurality of crystal or ceramic elements;
• wherein said amplifier, said phase shifting means and said bandpass filter are connected in series in a loop;
• and
• wherein said phase shifting means comprises an inductance for providing a lag current to a first transistor, a capacitance for providing a lead current to a second transistor, means for adjusting the current flow through at least one of said first and second transistors, and means for summing respective outputs from said first and second transistors.

An oscillator comprising a resonant circuit, said resonant circuit comprising:

• a plurality of crystals and a plurality of parallel conduction paths, one of said crystals being connected into each of said conduction paths;
• a summing amplifier, one end of each of said conduction paths being connected to an input of said summing amplifier;
• a voltage amplifier, the other end of each of said conduction paths being connected to an output of said voltage amplifier;
• and
• a phase shifting means connected between an output of said summing amplifier and an input of said voltage amplifier.

A method of perpetuating a color burst comprising the steps of:

• providing a plurality of parallel conduction paths, each of said conduction paths comprising a crystal, a resistor and a capacitor, the respective conduction paths having resonant frequencies at selected intervals within a selected range of frequencies;
• connecting one end of each of said conduction paths to an input terminal of a summing amplifier;
• and
• supplying said color burst to the other end of each of said conduction paths.