Apparatus and methods for rotary traveling wave oscillators (RTWOs) are disclosed. In certain embodiments, an RTWO system include an RTWO ring that carries a traveling wave, a plurality of selectable capacitors distributed around the RTWO ring and each operable in a selected state and an unselected state, and a decoder system that controls selection of the plurality of selectable capacitors based on a frequency tuning code. The frequency tuning code includes a fine tuning code and a coarse tuning code, and the decoder system is operable to maintain a constant number of capacitors that toggle state for each value of the fine tuning code.

The present disclosure relates to an oscillator device (15) comprising an amplifier unit (16) and a tunable waveguide resonator (1) which in turn comprises a rectangular waveguide part (2) having electrically conducting inner walls (3) and a first waveguide port (4). The amplifier unit (16) is arranged to be electrically connected to the waveguide resonator (1) via the first waveguide port (4) by means of a first connector (17). The waveguide resonator (1) comprises at least one tuning element (6) positioned within the waveguide part (2), wherein each tuning element (6) comprises an electrically conducting body (7) and a holding rod (8a, 8b). The holding rod (8a, 8b) is attached to the electrically conducting body (7) and is movable from the outside of the waveguide resonator (1) such that the electrically conducting body (7) can be moved between a plurality of positions within the waveguide part (2) by means of the holding rod (8a, 8b).

A vibration device includes a base including a semiconductor substrate and through electrodes that pass through the portion between first and second surfaces of the semiconductor substrate, and a vibrator fixed to the first surface via an electrically conductive joining member. The following components are placed at the second surface: an oscillation circuit that is electrically coupled to the vibrator via the through electrodes and generates an oscillation signal by causing the vibrator to oscillate, a temperature sensor circuit, a temperature compensation circuit that performs temperature compensation on the oscillation signal, and an output buffer circuit that outputs a clock signal based on the oscillation signal. Dsx1<Dbx1, a distance between the output buffer circuit and one of the through electrodes is Dbx1, a distance between the temperature sensor circuit and the other through electrode is Dsx1.

A voltage controlled oscillator (VCO) circuitry includes a varactor array. The varactor array includes a first varactor unit including a first varactor, a second varactor, and first switch circuitry. The first varactor is connected to a first node and a second node, and the second varactor is connected to the second node and a third node. The second node receives a voltage control signal. The first switch circuitry is electrically coupled to the first node and the third node, and selectively electrically couples a first voltage signal to the first node and the third node based on a first control signal.

Techniques are described that enables controlling the TNULL characteristic of a self-compensated oscillator by controlling the magnitude and direction of the frequency deviation versus temperature, and thus, compensating the frequency deviation.

An oscillator circuit includes an oscillating circuit coupled to a vibrator, and a control circuit that controls the oscillating circuit. The oscillator circuit has a normal operation mode in which the oscillating circuit oscillates in a state where a negative resistance value is a first value, and a start mode in which the oscillator circuit shifts from a state where oscillation is stopped to the normal operation mode. In the start mode, the control circuit controls the negative resistance value to increase from a second value which is smaller than the first value.

A phased-locked loop (PLL) circuit with an injection locked digital digitally controlled oscillator (ILD) that has an ILD control input element, an ILD injection input element and an ILD output element. The PLL circuit also includes an adaptive control unit (ACU), wherein the ACU is configured to receive an error signal and is configured to output an ILD control word. The ILD control input element is configured to receive the ILD control word, and the ILD control word may set a natural oscillation frequency of the ILD. The ILD is further configured to output a first output signal from the ILD output element, where the natural oscillation frequency may set a frequency of the first output signal.

A device includes a MEMS resonator and oscillator circuit coupled to the MEMS resonator. The circuit includes a first transistor having a first control terminal and first and second current terminals, and a second transistor having a second control terminal and third and fourth current terminals. The circuit includes a resonator coupling network configured to inductively couple MEMS resonator terminals to the first and third current terminals, and to couple the first and third current terminals. The circuit includes a control terminal coupling network configured to couple the first and second control terminals, and to reduce a voltage swing at the first and second control terminals relative to a voltage swing at the first and third current terminals. The circuit includes a second terminal coupling network configured to couple the second and fourth current terminals. A second terminal coupling network resonant frequency is approximately that of MEMS resonator.

An aspect of the present disclosure improves the linearity of a semiconductor switch. In an embodiment, a capacitor providing variable capacitance is provided between an input terminal and an output terminal of the switch, which results in such a benefit. According to another aspect, the capacitor is realized by multiple varactors connected in series between the input terminal and the output terminal. A biasing network is designed to cause a respective desired voltage to be applied across each varactor for obtaining the variable capacitance.

A voltage controlled oscillator (VCO) circuitry includes a varactor array. The varactor array includes a first varactor unit including a first varactor, a second varactor, and first switch circuitry. The first varactor is connected to a first node and a second node, and the second varactor is connected to the second node and a third node. The second node receives a voltage control signal. The first switch circuitry is electrically coupled to the first node and the third node, and selectively electrically couples a first voltage signal to the first node and the third node based on a first control signal.