An inductor arrangement has a first inductor structure having one or more inductors at least partially on a first layer and a second inductor structure having one or more inductors at least partially on a second layer. The inductors are arranged such that currents induced by an external magnetic field are substantially cancelled in at least one of the first inductor structure and the second inductor structure. The, or each, inductor of the second inductor structure overlaps, at least partially, the, or each, inductor of the first inductor structure. An oscillator circuit having an inductor arrangement is also presented.

A first tuning circuit tunes an oscillation frequency by changing, based on a first control signal, capacitance values of variable capacitive elements connected in parallel to an inductor. A second tuning circuit switches capacitive elements in and out of parallel connection with the inductor by turning on and off a transistor based on a second control signal, to thereby tune the oscillation frequency. A switching circuit includes n-channel transistors whose drains are connected via resistor elements to the source or drain of the transistor and a power and whose sources are grounded, and changes a bias voltage of the second tuning circuit by turning on and off the n-channel transistors based on the second control signal.

An oscillation module includes: an oscillation circuit; a multiplication circuit which is provided at a stage subsequent to the oscillation circuit and is operated by differential motion; and an output circuit which is provided at a stage subsequent to the multiplication circuit.

A resonant tank includes a first capacitor formed on a semiconductor substrate, a first inductor formed on the semiconductor substrate, a second capacitor formed on the semiconductor substrate, and a second inductor formed on the semiconductor substrate. The first capacitor, the first inductor, the second capacitor, and the second inductor are connected in a ring configuration, with each capacitor connected between a pair of the inductors and with each inductor connected between a pair of the capacitors. An amplifier circuit is coupled to the resonant tank and configured to amplify a signal in the resonant tank.

A semiconductor device includes a reference voltage generation circuit configured to generate reference voltages Va and Vb capable of adjusting a primary temperature characteristic, and an oscillation circuit configured to output an oscillation signal using the reference voltages Va and Vb, in which the oscillation circuit includes a frequency/current conversion circuit that is driven by the reference voltage Va and outputs a current Ie in accordance with a frequency of a feedback signal, a control voltage generation circuit configured to generate a control voltage in accordance with a potential difference between a voltage in accordance with the current Ie and the reference voltage Vb, a voltage control oscillation circuit configured to output the oscillation signal having a frequency in accordance with the control voltage, and a frequency division circuit configured to divide a frequency of the oscillation signal and output the resulting signal as the feedback signal.

A voltage controlled oscillator includes a resonator and an amplifier. The resonator includes a capacitive element and an inductive element. The inductive element has a plurality of conductive segments forming a physical loop. The inductive element has electrical connections on the physical loop to the plurality of conductive segments forming at least one electrical loop disposed within an interior space formed by the physical loop. The amplifier has an input and an output, the input coupled to a first conductive segment forming a first impedance and the output coupled to a second conductive segment forming a second impedance.

According to one embodiment, a dual voltage controlled oscillator (VCO) circuit includes a first VCO and a second VCO. The first VCO includes: a first variable capacitor having an input node, a first output node, and a second output node, a second variable capacitor coupled in parallel with the first variable capacitor, a first transistor, and a second transistor, where the first transistor has a first drain coupled to the first output node, a first gate coupled to the second output node, and a first source coupled to a ground, where the second transistor has a second drain coupled to the second output node and a second gate coupled to the first output node, and a second source coupled to the ground. The dual VCO circuit includes a second VCO mirroring the first VCO, a first and a second inductors coupled to the first and the second VCO respectively.

A wireless communication apparatus includes an oscillator circuit configured to generate an oscillation signal corresponding to an oscillation frequency determined by an antenna, and a bias generator circuit configured to reconfigure an operation region mode of a transistor included in the oscillator circuit by adjusting a bias signal in response to an enable signal.

An inductor arrangement has a first inductor structure having one or more inductors at least partially on a first layer and a second inductor structure having one or more inductors at least partially on a second layer. The inductors are arranged such that currents induced by an external magnetic field are substantially cancelled in at least one of the first inductor structure and the second inductor structure. The, or each, inductor of the second inductor structure overlaps, at least partially, the, or each, inductor of the first inductor structure. An oscillator circuit having an inductor arrangement is also presented.

Examples are disclosed that relate to oscillator circuits. One example provides a circuit comprising an amplifier, a resonator in parallel with the amplifier, and a shunt path including one or more circuit elements, the shunt path coupled to a first node downstream of an output of the amplifier and to a second node, the shunt path configured to shunt current received at the first node away from an input of the resonator and toward the second node, the second node having, at steady state, a relatively lower voltage than an input voltage of the resonator.