Oscillator circuits, electronic devices, and methods are disclosed. In one embodiment, an oscillator circuit includes a plurality of oscillator transistors comprising a plurality of gates, a plurality of adjustment transistors coupled to the plurality of gates, a differential output coupled to the plurality of oscillator transistors, a plurality of current transistors configured to receive one or more mixed bias current outputs, and generate a main current based on the one or more mixed bias current outputs, the one or more mixed bias current outputs and the main current being substantially constant over a range of temperatures, and one or more switches configured to set an oscillation frequency of the differential output by driving a first portion of a main current through at least one of the plurality of oscillator transistors, and driving a second portion of the main current through at least one of the plurality of adjustment transistors.

The present disclosure relates to a multi-mode voltage controlled oscillation device and a wireless transceiver. The multi-mode voltage controlled oscillation device includes an oscillation core circuit and at least four resonance circuits. Each of the resonance circuits includes two input ends and one power supply end. The two input ends of each of the resonance circuits are respectively connected to an output end of the oscillation core circuit, and the power supply end of each of the resonance circuits is configured to be connected to a power supply. The multi-mode voltage controlled oscillation device provided by the present disclosure is formed by connecting the oscillation core circuit with each resonance circuit and connecting the resonance circuits with each other, with a simple structure, a tight connection, and a small area.

A tank circuit (200) includes a tunable resonator subcircuit (210) having a first control input and having an effective parallel resistance that varies with tuning of the tunable resonator subcircuit (210). The tank circuit (200) further comprises a variable negative-resistance subcircuit (250) having a second control input and coupled in parallel to the tunable resonator subcircuit (210), where the variable negative-resistance subcircuit (250) is configured to provide a variable negative resistance, responsive to the control input, so as to increase the effective parallel resistance of the tank circuit (200).

A device for OOK modulating an input signal, comprising at least: an injection-locked oscillator comprising a power supply input, an injection signal input and an output to which the OOK modulated signal is to be delivered; a first controlled switch comprising a control input to which the input signal is to be applied, and configured to couple or not a power supply source to the power supply input of the injection-locked oscillator in dependence on the value of the input signal; a periodic signal providing device configured to deliver, on an output which is electrically coupled to the injection signal input of the injection-locked oscillator, a periodic injection signal whose frequency and amplitude trigger locking of the injection-locked oscillator at the frequency of the injection signal or a multiple of this frequency.

A voltage controlled oscillator (VCO) and buffer circuit includes a voltage controlled oscillator (VCO), a buffer circuit configured to receive a signal generated by the VCO, the buffer circuit comprising a first transistor having a parasitic gate-source capacitance (Cgs), and a second transistor coupled across the first transistor, wherein a gate of the first transistor is coupled to a drain and a source of the second transistor, and a gate of the second transistor is coupled to a source of the first transistor.

Disclosed herein is a fine capacitance tuning circuit for a digitally controlled oscillator. The tuning circuit has low and high frequency tuning banks formed by varactors that have their top plates connected to one another. A controller initially sets states of switches selectively connecting the bottom plates of the varactors of the low frequency bank to a low voltage, a high voltage, or to an RC filter, in response to an integer portion of a control word. A sigma-delta modulator initially sets the states of switches selectively connecting the bottom plates of the varactors of the high frequency bank to either the low voltage or the high voltage, in response to a fractional portion of the control word. The controller modifies the states of the switches of the tuning banks in a complementary fashion, based upon comparisons between the fractional portion of the control word and a series of thresholds.

An LC oscillator capable of temperature compensation includes a differential voltage supplier providing a positive differential voltage to a positive node and a negative differential voltage to a negative node and a differential oscillation frequency signal output unit outputting a positive oscillation frequency signal using the positive differential voltage provided to the positive node by the differential voltage supplier and a negative oscillation frequency signal using the negative differential voltage provided to the negative node by the differential voltage supplier.

A differential crystal oscillator includes a source follower configured to receive an oscillatory signal and output a regenerated signal; a resonant network having a crystal and configured to terminate the oscillatory signal and determine an oscillation frequency of the oscillatory signal; a regenerative network configured to regenerate the regenerated signal; and a capacitive feedback network configured to provide a feedback from the regenerated signal to the oscillatory signal.

An analog computing system with coupled non-linear oscillators can solve complex combinatorial optimization problems using the weighted Ising model. The system is composed of a fully-connected LC oscillator network with low-cost electronic components and compatible with traditional integrated circuit technologies. Each LC oscillator, or node, in the network can be coupled to each other node in the array with a multiply and accumulate crossbar array or optical interconnects. When implemented with four nodes, the system performs with single-run ground state accuracies of 98% on randomized MAX-CUT problem sets with binary weights and 84% with five-bit weight resolutions. The four-node system can obtain solutions within five oscillator cycles with a time-to-solution that scales directly with oscillator frequency. A scaling analysis suggests that larger coupled oscillator networks may be used to solve computationally intensive problems faster and more efficiently than conventional algorithms.

Transformer circuitry comprising: a transformer having a primary coil and a secondary coil, the primary coil having first and second primary terminals and the secondary coil having first and second secondary terminals, and a secondary coil driver configured to drive a secondary voltage signal V2 across the secondary terminals which has a target relationship with a primary voltage signal V1 driven across the primary terminals by a primary coil driver so that an inductance value measured between the primary terminals is governed by the target relationship.