Methods and systems described herein relate to broadcasting on a wireless channel. An example method includes generating, based on data, a data signal including one or more data packets, where each of the one or more data packets is a non-connectable and non-scannable data packet. The method further includes generating a plurality of RF signals of different frequencies using an oscillator circuit, directly modulating at least one of the RF signals, based on the data signal, to generate a modulated RF signal, amplifying the modulated RF signal, and broadcasting the amplified modulated RF signal on the wireless channel.

A method and a circuit for exciting a crystal oscillation circuit are disclosed herein. The crystal oscillation circuit comprising: charging, with a charging circuit, a voltage-controlled oscillator; providing, with the voltage-controlled oscillator, an exciting signal; blocking, with a direct current blocking capacitor, direct current from the voltage-controlled oscillator to the crystal oscillation circuit; and exciting, with the exciting signal, the crystal oscillation circuit. The circuit for exciting a crystal oscillation circuit, comprising: a charging circuit; a voltage-controlled oscillator coupled to the charging circuit and configured to provide an exciting signal to the crystal oscillation circuit; and a direct current blocking capacitor connected between the voltage-controlled oscillator and the crystal oscillation circuit and configured to block direct current from the voltage-controlled oscillator.

A temperature compensated oscillator includes a resonator element, an oscillation circuit, and a temperature compensation circuit. Assuming an observation time as T, an MTIE value at 0.1 s<1 s is 1.3 ns or less, an MTIE value at 1 s<10 s is 1.3 ns or less, an MTIE value at 10 s<100 s is 1.8 ns or less, an MTIE value at 100 s<1000 s is 2.9 ns or less, a TDEV value at 0.1 s<10 s is 47 ps or less, a TDEV value at 10 s<100 s is 65 ps or less, and a TDEV value at 100 s<1000 s is 94 ps or less.

In accordance with an embodiment, a method of operating a voltage controlled oscillator (VCO) includes generating a first oscillating signal in a first VCO core and generating a second oscillating signal in a second VCO core, such that the first oscillating signal and the second oscillating signal have a same frequency and a fixed phase offset. The VCO includes the first VCO core and the second VCO core, and each VCO core includes a pair of transistors. The VCO also includes a transformer having a first winding coupled between control nodes of the pair of transistors of the first VCO core and a second winding coupled between control nodes of the pair of transistors of the second VCO core.

A synchronous oscillation circuit has multiple oscillators, a grounding unit and a common floating grounding unit. Each of the oscillators has a ground terminal. The grounding unit has a first terminal and a second terminal, wherein the second terminal is grounded. The common floating grounding unit is electrically connected between the ground terminals of the oscillators and the first terminal of the grounding unit. The oscillators are grounded through the common floating grounding unit and the grounding unit, so that the oscillators interfere with each other. When the oscillation signals generated by the oscillators reach a steady state, the oscillation frequencies of the oscillators are synchronized.

A wireless communication device is presented for use with a sensor. The wireless communication device includes: an antenna, a driver circuit and a bias circuit. The driver circuit is electrically coupled to the antenna and includes at least one pair of cross-coupled transistors. The bias circuit is electrically coupled to the driver circuit. In a transmit mode, the bias circuit biases the driver circuit with a first bias current. In response to the first bias current, the driver circuit oscillates the antenna. In a receive mode, the bias circuit biases the driver circuit with a second bias current, such that the first bias current differs from the second bias current. In response to the second bias current, the bias circuit amplifies a signal received by the antenna.

A differential Colpitts voltage-controlled oscillator according to example embodiments includes a feedback circuit constituting a Colpitts oscillator structure, a negative resistance circuit including a first negative resistance transistor and a second negative resistance transistor cross-coupled to each other and connected to the feedback circuit, a resonance circuit including a first inductor and a variable capacitor connected to both ends of the first inductor to generate differential output signals base on outputs of the feedback circuit, and a phase noise reduction circuit coupled to the feedback circuit to remove phase noise.

Aspects of this disclosure relate to a first die includes an LC resonant circuit including a first capacitive element, such as a capacitor or a varactor, and an inductive element. The LC resonant circuit is configured to generate a signal having a frequency of oscillation. The first die includes bump pads electrically coupled to both ends of the first capacitive element. A second die can be flip chip mounted on the first die. Bumps can electrically connect a second capacitive element of the second die in parallel with the first capacitive element of the first die. This can increase the Q factor of the LC resonant circuit.

A high-power transmitter with a fully-integrated phase Iocking capability is disclosed and characterized. Also provided herein is a THz radiator structure based on a return-path gap coupler, which enables the high-power generation of the disclosed transmitter, and a self-feeding oscillator suitable for TS use with the transmitter.

An oscillator includes a front side voltage divider, a rear side voltage divider, and an oscillation unit. The front side voltage divider includes a first resistor connected between a first and second potential sources, and a first output terminal configured to changeably connect to a connection position in the first resistor so as to vary an obtained output voltage. The rear side voltage divider includes a second resistor connected between the first output terminal and a third potential source; and a second output terminal configured to changeably connect to a connection position in the second resistor so as to vary an obtained output voltage. The oscillation unit includes a variable capacitance element with a capacitance varied according to the output voltage from the second output terminal. The oscillation unit varies an output frequency based on a variation in a resonance point associated with a variation in the capacitance.