Methods and apparatus for generating two-tone calibration signals for performing linearity calibration

An apparatus for wireless communications, comprising:

• a tone generating circuit configured to generate a first single-tone signal from a digital clock signal;
• and
• a mixer connected with the tone generating circuit and configured to mix the first single-tone signal with a second single-tone signal to provide a two-tone signal having frequencies at a sum and a difference of frequencies of the first and second single-tone signals.

An apparatus for wireless communications, comprising:

• means for generating a first single-tone signal from a digital clock signal;
• and
• means for mixing the first single-tone signal with a second single-tone signal to provide a two-tone signal having frequencies at a sum and a difference of frequencies of the first and second single-tone signals.