Variable frequency relaxation oscillator

A relaxation oscillator system for generating an oscillating output signal based on a frequency control (FC) signal, the system comprising:

• a relaxation oscillator configured to generate the oscillating output signal;
• and
• a frequency control (FC) unit that controls the frequency of the oscillating output signal generated by the relaxation oscillator, wherein:
• the FC unit generates at least first and second control signals for provision to the relaxation oscillator;
• the first and second control signals are generated based on the FC signal and a feedback signal from the relaxation oscillator;
• the first control signal is different from the second control signal;
• and
• the frequency of the oscillating output signal is controlled based on the first and second control signals,
• wherein:
• the relaxation oscillator comprises a first oscillator sub-circuit, a second oscillator sub-circuit, and a latch;
• the first oscillator sub-circuit receives the first control signal for controlling a first sub-circuit output signal provided by the first oscillator sub-circuit to the latch;
• the second oscillator sub-circuit receives the second control signal for controlling a second sub-circuit output signal provided by the second oscillator sub-circuit to the latch;
• and
• the latch generates the oscillating output signal and the feedback signal.

A relaxation oscillator system for generating an oscillating output signal based on a frequency control (FC) signal, the system comprising:

• a relaxation oscillator configured to generate the oscillating output signal;
• and
• a frequency control (FC) unit that controls the frequency of the oscillating output signal generated by the relaxation oscillator, wherein:
• the FC unit generates at least first and second control signals for provision to the relaxation oscillator;
• the first and second control signals are generated based on the FC signal and a feedback signal from the relaxation oscillator;
• the first control signal is different from the second control signal;
• and
• the frequency of the oscillating output signal is controlled based on the first and second control signals,
• wherein:
• data on the first control signal and the second control signal represent n-bit binary numbers for setting the frequency of the first latch output signal;
• data on the frequency control signal represents an m-bit binary number for setting the frequency of the first latch output signal;
• and
• n is different from m.