Trimming of local oscillation in an integrated circuit radio

An integrated circuit radio having an adjustable local oscillation, the integrated circuit radio comprises:

• means for receiving a radio frequency (RF) signal having a known frequency;
• means for mixing the RF signal with a receiver local oscillation to produce a low intermediate frequency (IF) signal;
• means for demodulating the low IF signal to produce demodulated data;
• means for determining a DC offset from the demodulated data;
• means for determining if magnitude of the DC offset exceeds an upper limit of an allowable offset threshold or lower limit of the allowable offset threshold;
• and
• means for adjusting the receiver local oscillation to reduce the DC offset when the magnitude of the DC offset exceeds the upper limit or the lower limit of the allowable offset threshold.

A method for trimming a local oscillation of an integrated circuit radio, the method comprises:

• during test of the integrated circuit radio;
• receiving a radio frequency (RF) signal having a known frequency;
• mixing the RE signal with the local oscillation to produce a low intermediate frequency (IF) signal;
• demodulating the low IF signal to produce a demodulated data;
• determining a DC offset from the demodulated data;
• determining a crystal offset fractional value to reduce the DC offset when the DC offset compares unfavorably with an allowable offset threshold;
• and
• generating a fractional-N divider value of the local oscillation based on the crystal offset fractional value, an integer value, and a set fractional value;
• during operation of the integrated circuit radio:
• receiving an operational offset fractional value;
• and
• generating the fractional-N divider value based on the crystal offset fractional value, the integer value, the set fractional value, and the operational offset fractional value.

A method for trimming a local oscillation of an integrated circuit radio, the method comprises:

• during test of the integrated circuit radio:
• receiving a crystal offset fractional value;
• and
• generating a fractional-N divider value of the local oscillation based on the crystal offset fractional value, an integer value, and a set fractional value;
• during operation of the integrated circuit radio;
• receiving a radio frequency (RF) signal;
• mixing the RE signal with the local oscillation to produce a low intermediate frequency (IF) signal;
• demodulating the low IF signal to produce a demodulated data;
• determining a DC offset from the demodulated data;
• determining the operational offset fractional value to reduce the DC offset when the DC offset compares unfavorably with an allowable offset threshold;
• and
• generating the fractional-N divider value based on the crystal offset fractional value, the integer value, the set fractional value, and the operational offset fractional value.

An apparatus for trimming a local oscillation of an integrated circuit radio, the apparatus comprises:

• during test of the integrated circuit radio:
• means for receiving a radio frequency (RF) signal having a known frequency;
• means for mixing the RF signal with the local oscillation to produce a low intermediate frequency (IF) signal;
• means for demodulating the low IF signal to produce a demodulated data;
• means for determining a DC offset from the demodulated data;
• means for determining a crystal offset fractional value to reduce the DC offset when the DC offset compares unfavorably with an allowable offset threshold;
• and
• means for generating a fractional-N divider value of the local oscillation based on the crystal offset fractional value, an integer value, and a set fractional value;
• during operation of the integrated circuit radio:
• means for receiving an operational offset fractional value;
• and
• means for generating the fractional-N divider value based on the crystal offset fractional value, the integer value, the set fractional value, and the operational offset fractional value.

An apparatus for trimming a local oscillation of an integrated circuit radio, the apparatus comprises:

• during test of the integrated circuit radio:
• means for receiving a crystal offset fractional value;
• and
• means for generating a fractional-N divider value of the local oscillation based on the crystal offset fractional value, an integer value, and a set fractional value,
• during operation of the integrated circuit radio:
• means for receiving a radio frequency (RF) signal;
• means for mixing the RF signal with the local oscillation to produce a low intermediate frequency (IF) signal;
• means for demodulating the low IF signal to produce a demodulated data;
• means for determining a DC offset from the demodulated data;
• means for determining the operational offset fractional value to reduce the DC offset when the DC offset compares unfavorably with an allowable offset threshold;
• and
• means for generating the fractional-N divider value based on the crystal offset fractional value, the integer value, the set fractional value, and the operational offset fractional value.