Method and apparatus for generating corrected quadrature phase signal pairs in a communication device

A method for generating a corrected quadrature phase signal pair comprising:

• generating a local oscillator signal;
• generating a quadrature phase signal pair ([I, Q]) in response to the local oscillator signal, wherein the quadrature phase signal pair comprises a first quadrature phase signal (I) and a second quadrature phase signal (Q);
• generating a control signal in response to the corrected quadrature phase signal pair;
• adjusting a delay between the first quadrature phase signal and the second quadrature phase signal responsive to the generated control signal;
• adjusting duty cycle of the quadrature phase signal pair responsive to the generated control signal, thereby generating the corrected quadrature phase signal pair;
• and
• delaying the quadrature phase signal pair by a preconfigured time period to provide the corrected quadrature phase signal pair before generating the control signal.

A communication device, comprising:

• a receiver;
• a transmitter;
• a quadrature phase generator providing a quadrature phase signal pair (I, Q) wherein the quadrature phase signal pair comprises a first quadrature phase signal (I) and a second quadrature phase signal (Q);
• a programmable delay element pair receiving the quadrature phase signal pair, the programmable delay element pair being configured by a control signal,
• a control circuit generating the control signal in response to outputs of the programmable delay element pair;
• and
• wherein the programmable delay element pair adjusts a delay between the first quadrature phase signal and the second quadrature phase signal and adjusts a duty cycle of the received quadrature phase signal pair to thereby provide a corrected quadrature phase signal pair as the outputs of the programmable delay element pair for use in the receiver and the transmitter.

An apparatus comprising:

• a quadrature phase generator generating two quadrature phase signal pairs ([I,Q] and [Ix,Qx]) wherein a first quadrature phase signal pair comprises a first quadrature phase signal (I) and a second quadrature phase signal (Q), and wherein a second quadrature phase signal pair comprises a third quadrature phase signal (Ix) and a fourth quadrature phase signal (Qx);
• a control circuit generating a first control signal and a second control signal in response to outputs of a first programmable delay element pair and outputs of a second programmable delay element pair;
• the first programmable delay element pair receiving the first quadrature phase signal pair, the first programmable delay element pair being configured by the first control signal;
• and
• the second programmable delay element pair receiving the second quadrature phase signal pair, the second programmable delay element pair being configured by the second control signal,
• wherein the first programmable delay element pair adjusts a delay between the first quadrature phase signal and the second quadrature phase signal and adjusts a duty cycle of the first quadrature phase signal pair to thereby provide a corrected first quadrature phase signal pair as outputs of the first programmable delay element pair, and
• wherein the second programmable delay element pair adjusts a delay between the third quadrature phase signal and the fourth quadrature phase signal and adjusts a duty cycle of the second quadrature phase signal pair to thereby provide a corrected second quadrature phase signal pair as outputs of the second programmable delay element pair.

A signal generator, comprising:

• a quadrature phase generator providing a quadrature phase signal pair:
• a programmable delay element pair receiving the quadrature phase signal pair;
• and
• a control circuit generating a control signal in response to outputs of the programmable delay element pair:
• and
• the programmable delay element pair adjusting a delay and adjusting a duty cycle of the quadrature phase signal pair to provide a corrected quadrature phase signal pair as the outputs of the programmable delay element pair.