Abstract:
In an example embodiment, an apparatus includes an LC circuit having a capacitive circuit and an inductive circuit connected in a circuit loop. In a first mode, a switching circuit in the inductive circuit provides a charge voltage across the LC circuit and prevents oscillation of the LC circuit by opening a switch in the circuit loop. In a second mode, the switching circuit enables the oscillation of the LC circuit by closing the switch in the circuit loop. The adjustable capacitive circuit includes capacitive branch circuits configured to contribute a first amount of capacitance when enabled. For each capacitive branch circuit, an initialization circuit couples the set of capacitors to a respective reference voltage in response to the capacitive branch circuit being disabled and the switching circuit operating in the first mode.
Abstract:
A resonator for a high frequency electric oscillator is disclosed. The resonator is and integrated capacitor and inductor. The capacitance and inductance of the resonator are continuously and simultaneously adjustable. The resonator includes a coaxial portion and a conductor portion. The coaxial portion has an inner dielectric with a longitudinal aperture and an outer conductive sheath or outer conductor. The conductor portion has a straight section slidable in the aperture and a V shaped bent or oblique section.
Abstract:
A microwave oscillator having at least one transistor (1), which may be bipolar or otherwise. A tunable reactive circuit (13, 15, 16) suitable for adjusting the transistor's zone of potential instability is inserted in the emitter circuit of the transistor (1) (or in the source circuit of an FET). The reactive circuit comprises a series length of transmission line (13) and a parallel capacitance (15, 16) constituted, at least in part, by a conducting slab (15) of adjustable size.
Abstract:
A first pair of NPN transistors operate to amplify and limit an input signal. A second pair of NPN transistors, gated on by the first pair, function to provide the circuit output when an input is applied, and function together in conjunction with an RLC tank to oscillcate a predetermined frequency when no input is applied.