According to one embodiment, an oscillator circuit includes a resonant circuit and first and second negative-resistance circuits. Each of the first and second negative-resistance circuits includes a first power-supply terminal, a second power-supply terminal, an input terminal and an output terminal. The first and second negative-resistance circuits are connected in series between a first power supply and a second power supply at the first and second power-supply terminals, and connected parallel to the resonance circuit at the input and output terminals.

According to one embodiment, an oscillator circuit includes a resonant circuit and first and second negative-resistance circuits. Each of the first and second negative-resistance circuits includes a first power-supply terminal, a second power-supply terminal, an input terminal and an output terminal. The first and second negative-resistance circuits are connected in series between a first power supply and a second power supply at the first and second power-supply terminals, and connected parallel to the resonance circuit at the input and output terminals.

An element which oscillates or detects terahertz waves includes a resonance unit including a differential negative resistance element, a first conductor, a second conductor, and a dielectric body, a bias circuit configured to supply a bias voltage to the differential negative resistance element, and a line configured to connect the resonance unit and the bias circuit to each other. The differential negative resistance element and the dielectric body are disposed between the first and second conductors. The line is a low impedance line in a frequency f.sub.LC of resonance caused by inductance of the line and capacitance of the resonance unit using an absolute value of a differential negative resistance of the differential negative resistance element as a reference.

Embodiments of the present disclosure provide a system for detecting and precisely measuring information content of one or more environmental conditions. The system may include a plurality of oscillator circuits that are coupled together. The coupling of the oscillator circuits generates an output signal having a pattern of amplitude and frequency. The pattern of amplitude and frequency changes as one or more values of the environmental condition(s) change.

Embodiments of the present disclosure provide a system for detecting and precisely measuring information content of one or more environmental conditions. The system may include a plurality of oscillator circuits that are coupled together. The coupling of the oscillator circuits generates an output signal having a pattern of amplitude and frequency. The pattern of amplitude and frequency changes as one or more values of the environmental condition(s) change.

According to one embodiment, an oscillator circuit includes a resonant circuit and first and second negative-resistance circuits. Each of the first and second negative-resistance circuits includes a first power-supply terminal, a second power-supply terminal, an input terminal and an output terminal. The first and second negative-resistance circuits are connected in series between a first power supply and a second power supply at the first and second power-supply terminals, and connected parallel to the resonance circuit at the input and output terminals.

According to one embodiment, an oscillator circuit includes a resonant circuit and first and second negative-resistance circuits. Each of the first and second negative-resistance circuits includes a first power-supply terminal, a second power-supply terminal, an input terminal and an output terminal. The first and second negative-resistance circuits are connected in series between a first power supply and a second power supply at the first and second power-supply terminals, and connected parallel to the resonance circuit at the input and output terminals.