Systems, methods, and devices for frequency calibration of transmitters

A method comprising:

• determining, using a calibration circuit, a first frequency of a first output signal generated by an oscillator circuit during a first measurement period, the first output signal being generated based on a first data signal representing, at least in part, a first data value, the first data signal being received from a gain control circuit;
• determining, using the calibration circuit, a second frequency of a second output signal generated by an oscillator circuit during a second measurement period, the second output signal being generated based on a second data signal representing, at least in part, a second data value, the second data signal being received from the gain control circuit;
• generating, using the calibration circuit, an adjustment value based on the first frequency, the second frequency, and a reference value, the adjustment value identifying a ratio between the reference value and a difference between the first frequency and the second frequency;
• and
• adjusting a gain of the gain control circuit based on the generated adjustment value.

A system comprising:

• a digital subsystem comprising:
• a data source configured to generate a first data signal based on a first data value, and further configured to generate a second data signal based on a second data value;
• a gain control circuit configured to receive the first and second data signals from the data source, and further configured to generate a first modified data signal and a second modified data signal by amplifying the received first and second data signals by a gain;
• a control subsystem comprising:
• an oscillator circuit configured to generate a first output signal and a second output signal based, at least in part, on the first and second modified data signals, the first output signal having a first frequency, and the second output signal having a second frequency;
• and
• a calibration circuit configured to receive the first and second output signals generated by the oscillator circuit, configured to determine an adjustment value based on the received first and second output signals, and further configured to change the gain of the gain control circuit based on the determined adjustment value.