A semiconductor device and a method for controlling amplitude of signal in the semiconductor device are provided. The semiconductor device comprises a signal generator configured to output a sinewave, a comparator configured to compare a magnitude of the sinewave with a magnitude of a reference signal at a first timing corresponding to a timing control signal and to output a comparison result, and a control signal adjustor configured to adjust one of the current control signal and a timing control signal depending on the comparison result of the comparator.

A calibration circuit for calibrating a peak detector configured to detect a signal peak amplitude of an oscillator, including: a calibration oscillator configured to be supplied by at least two different supply voltages to generate respective calibration signals; a calibration peak detector configured to detect a calibration signal peak amplitude of each of the calibration signals; and a logic circuit configured to calibrate the peak detector based on the detected calibration signal peak amplitudes.

An LC oscillator has a tank driver connected to cause a matched-resistance LC tank to oscillate. The LC tank has an inductor leg in parallel with a capacitor leg. The inductor leg has an explicit inductor having an implicit resistance level R.sub.L. The capacitor leg has an explicit capacitor having an implicit resistance level R.sub.C connected in series with an explicit resistor having an explicit resistance level R.sub.R, where R.sub.M=(R.sub.C+R.sub.R) is substantially equal to R.sub.L. The LC oscillator may have a non-trimmable LC tank and be part of a temperature-compensated frequency reference generator having standalone frequency adjustment circuitry that offers better than 0.1% frequency accuracy (after single trim and batch calibration) over process, voltage, and temperature variations, and lifetime, which can serve as a low-cost replacement for a crystal oscillator for many applications.

An LC oscillator powering arrangement comprises an LC oscillator configured to provide an oscillating signal output; a current source configured to supply the LC oscillator with a supply current, the current source during operation being controlled by a control voltage and supplied with a supply voltage subject to supply voltage ripple; and a replication block configured to generate an amplified replica of the supply voltage ripple directly from the supply voltage and to overlay the replica on the control voltage.

A current control device for a differential circuit is provided. The current control device includes a differential circuit that generates differential signals comprising a positive signal and a negative signal in opposite phases, an amplitude detection circuit detecting an amplitude of the differential signal and outputting first and second detection voltages, an error amplification circuit controlling the differential circuit on the basis of an error voltage between the first and second detection voltages, and a current control circuit controlling the amplitude detection circuit on the basis of any one of the first and second detection voltages.

An example oscillator device comprises (i) an oscillation circuit arranged for generating and outputting an oscillation signal and comprising an active circuit to ensure oscillation is maintained, (ii) a voltage-to-current conversion replica circuit of the active circuit arranged for receiving the oscillation signal and for outputting a current proportional to the oscillation signal, (iii) biasing means arranged to generate a constant bias current to activate the oscillation circuit, and (iv) subtraction means for subtracting the current proportional to the oscillation signal from the bias current, thereby obtaining a resulting current which can be used for adapting the oscillation signal's amplitude.

The present disclosure describes a low-power, low-phase-noise (LPLPN) oscillator. The LPLPN oscillator includes a resonator load, an amplifier stage, and a loop gain control circuit. The resonator load is structured to resonate at a primary resonant frequency. The amplifier stage is coupled with the resonator load to develop a loop gain that peaks at the primary resonant frequency. The loop gain control circuit is coupled with the amplifier stage, and it is structured to regulate the loop gain for facilitating the amplifier stage to generate an oscillation signal at the primary resonant frequency and suppress a noise signal at a parasitic parallel resonant frequency (PPRF).

A frequency generation solution controls an oscillator amplitude using two feedback paths to generate high frequency signals with lower power consumption and lower noise. A first feedback path provides continuous control of the oscillator amplitude responsive to an amplitude detected at the oscillator output. A second feedback path provides discrete control of the amplitude regulating parameter(s) of the oscillator responsive to the detected oscillator amplitude. Because the second feedback path enables the adjustment of the amplitude regulating parameter(s), the second feedback path enables an amplifier in the first feedback path to operate at a reduced gain, and thus also at a reduced power and a reduced noise, without jeopardizing the performance of the oscillator.

A circuit may comprise a first node, a ring oscillator, a regulator, and a Kvcc compensation circuit. The first node may be a supply node to provide a supply voltage for the circuit. The ring oscillator may be formed from inverters. The regulator may use a single transistor between the first node and a second node for powering the oscillator. The K compensation circuit may be used to provide to the oscillator a variable capacitive load that is dependent on the supply at the first supply node, and it may drag oscillator frequency down when the first node supply goes up.

A current control device for a differential circuit is provided. The current control device includes a differential circuit that generates differential signals comprising a positive signal and a negative signal in opposite phases, an amplitude detection circuit detecting an amplitude of the differential signal and outputting first and second detection voltages, an error amplification circuit controlling the differential circuit on the basis of an error voltage between the first and second detection voltages, and a current control circuit controlling the amplitude detection circuit on the basis of any one of the first and second detection voltages.