Clock synthesizer with dual control

A method for producing an alternating signal, the method comprising:

• producing, by an oscillator, an output signal with a frequency;
• producing, by a voltage control circuit, a control voltage for the oscillator based on the frequency of the output signal;
• producing, by a frequency control circuit, a control signal for the oscillator based on (i) an input voltage to the frequency control circuit and (ii) the control voltage;
• adjusting, by the oscillator and based on the control signal, the frequency of the output signal;
• and
• adjusting, by the voltage control circuit, the control voltage to be closer to the input voltage after the oscillator adjusts the frequency of the output signal.

A circuit for producing an alternating signal, the circuit comprising:

• a voltage control circuit arranged to produce a control voltage;
• a frequency control circuit arranged to produce a control signal;
• and
• an oscillator arranged to produce an output signal with a frequency based on the control voltage and the control signal, wherein the frequency control circuit is further arranged to adjust the control signal such that the voltage control circuit adjusts the control voltage to be closer to an input voltage to the frequency control circuit.