Semiconductor Components Industries, LLC

Lucas Emiel Elie Vander Voorde

Jan Plojhar

Pavel Mares

Circuits and processes for locking a voltage-controlled oscillator (VCO) at a high frequency signal are described. A circuit may include an adjustable current converter (ACC), coupled at an input terminal to a power source, operable to output a control signal (VC) at an output terminal. A first switch may be coupled to the ACC and to the VCO. The VCO, when in an 'ON' state, receives the control signal and outputs a high frequency signal (VHF). A digital filter may be coupled to the VCO and operable to receive the VHF. Based on the VHF, the digital filter generates a data signal having a data value. The circuit may also include a digital-to-analog converter (DAC) operable to receive the data signal and, based on the data value, output an adjustment signal to the ACC. The ACC may adjust the control signal based on the adjustment signal received from the DAC.

RC time based locked voltage controlled oscillator

Devices, systems, and methods for locking a voltage controlled oscillator (VCO) at a high frequency may include use of a VCO and an integrator, which generates and outputs a control signal to the VCO, based on an inverting signal and a reference signal. The control signal locks the VCO to a high frequency signal (FH). A frequency divider is coupled to the VCO, receives FH from the VCO, divides FH by a factor 'F', and outputs a low frequency signal (FL). A switched capacitor resistor circuit (SCRC) is coupled to the frequency divider and the integrator. The SCRC receives FL from the frequency divider and generates the inverting signal. An integrating capacitor is coupled across an inverting and an output terminal of op-amp in the integrator. The output of the op-amp provides an integrator signal, which may be (optionally) filtered to produce the control signal.

Timing circuit for locking a voltage controlled oscillator to a high frequency by use of low frequency quotients and resistor to switched capacitor matching

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Heindonk, Czechia

Lucas Emiel Elie Vander Voorde