Oscillating circuit with reduced decay and transient times

A circuit arrangement comprising:

• an oscillating circuit including a capacitor and a coil;
• a control unit connected by first and second energizing leads to said oscillating circuit and adapted to selectively energize an oscillation of said oscillating circuit through said energizing leads;
• a controllable variable current source having a source output terminal, and having a source control terminal connected to said control unit;
• and
• a first switching element that is interposed and connected between said source output terminal of said source and said oscillating circuit, and that has a first switch control terminal connected to said control unit;
• wherein said oscillating circuit is a parallel circuit having said capacitor and said coil connected in parallel with each other, said first energizing lead and said second energizing lead are respectively connected to opposite first and second sides of said capacitor and of said coil, and said first switching element is interposed and connected between said source output terminal and said second side of said capacitor and of said coil.

A circuit arrangement comprising:

• an oscillating circuit including a capacitor and a coil;
• a control unit connected by first and second energizing leads to said oscillating circuit and adapted to selectively energize an oscillation of said oscillating circuit through said energizing leads;
• a current source having a source output terminal, and having a source control terminal connected to said control unit;
• and
• a first switching element that is interposed and connected between said source output terminal of said source and said oscillating circuit, and that has a first switch control terminal connected to said control units;
• wherein said oscillating circuit is a parallel circuit having said capacitor and said coil connected in parallel with each other, said first energizing lead and said second energizing lead are respectively connected to opposite first and second sides of said capacitor and of said coil, and said first switching element is interposed and connected between said source output terminal and said second side of said capacitor and of said coil;
• and
• wherein said control unit is adapted to control said first switching element via said first switch control terminal so as to connect said source output terminal of said current source to said second side of said coil and of said capacitor when said control unit is not energizing said oscillation through said energizing leads, and so as to disconnect said source output terminal of said current source from said second side of said coil and said capacitor when said control unit is energizing said oscillation through said energizing leads.

A circuit arrangement comprising:

• an oscillating circuit including a capacitor and a coil;
• a control unit connected by first and second energizing leads to said oscillating circuit and adapted to selectively energize an oscillation of said oscillating circuit through said energizing lead;
• a voltage source having a source output terminal, and having a source control terminal connected to said control unit;
• and
• a first switching element that is interposed and connected between said source output terminal of said source and said oscillating circuit, and that has a first switch control terminal connected to said control unit;
• wherein said oscillating circuit is a parallel circuit having said capacitor and said coil connected in parallel with each other, said first energizing lead and said second energizing lead are respectively connected to opposite first and second sides of said capacitor and of said coil, and said first switching element is interposed and connected between said source output terminal and said second side of said capacitor and of said coil.

A circuit arrangement comprising:

• an oscillating circuit including a capacitor and a coil;
• a control unit connected by first and second energizing leads to said oscillating circuit and adapted to selectively energize an oscillation of said oscillating circuit through said energizing leads;
• an electrical source having a source output terminal, and having a source control terminal connected to said control unit;
• and
• a first switching element that is interposed and connected between said source output terminal of said source and said oscillating circuit, and that has a first switch control terminal connected to said control unit;
• wherein said oscillating circuit is a series circuit having said capacitor and said coil connected in series with each other, whereby an intermediate node is provided therebetween, said first energizing lead is connected to a first side of said coil opposite said intermediate node, said second energizing lead is connected to a second side of said capacitor opposite said intermediate node, and said first switching element is interposed and connected between said source output terminal and said intermediate node.

A method of operating a circuit arrangement including:

• an oscillating circuit including a capacitor and a coil;
• a control unit connected by first and second energizing leads to said oscillating circuit and adapted to selectively energize an oscillation of said oscillating circuit through said energizing leads;
• a current source having a source output terminal, and having a source control terminal connected to said control unit;
• and
• a first switching element that is interposed and connected between said source output terminal of said source and said oscillating circuit, and that has a first switch control terminal connected to said control unit;
• for reducing at least a start-up transient time of said oscillation, wherein said method comprises the steps:
• a) operating said control unit to energize said oscillation of said oscillating circuit through said energizing leads, and to open said first switching element so as to disconnect said source output terminal of said current source from said oscillating circuit;
• b) operating said control unit to cease said energizing of said oscillation of said oscillating circuit through said energizing leads, to close said first switching element so as to connect said source output terminal of said current source to said oscillating circuit and thereby to drive a current from said current source through said coil;
• and
• c) repeating said step a) and b).

A method of operating a circuit arrangement including:

• an oscillating circuit including a capacitor and a coil;
• a control unit connected by first and second energizing leads to said oscillating circuit and adapted to selectively energize an oscillation of said oscillating circuit through said energizing leads;
• a voltage source having a source output terminal, and having a source control terminal connected to said control unit;
• a first switching element that is interposed and connected between said source output terminal of said source and said oscillating circuit, and that has a first switch control terminal connected to said control unit;
• and
• a second switching element that is arranged and connected between said coil and said capacitor so as to selectively connect and disconnect said coil and said capacitor relative to each other and that has a second switch control terminal connected to said control unit;
• for reducing at least a start-up transient time of said oscillation, wherein said method comprises the steps:
• a) operating said control unit to energize said oscillation of said oscillating circuit through said energizing leads, to open said first switching element so as to disconnect said source output terminal of said voltage source from said oscillating circuit, and to close said second switching element so as to connect said coil and said capacitor relative to each other;
• b) operating said control unit to cease said energizing of said oscillation of said oscillating circuit through said energizing leads, to close said first switching element so as to connect said source output terminal of said voltage source to said oscillating circuit and thereby to apply a voltage from said voltage source to said capacitor, and to open said second switching element so as to disconnect said coil from said capacitor;
• and
• c) repeating said steps a) and b).