Control circuit for automatically controlled feed forward nonlinear distortion compensation amplifier

A control circuit used to control an amplifier, wherein the amplifier comprises a main amplifier amplifying an input signal, first coupling means for coupling an output of said main amplifier to a first feed forward signal and for generating a second feed forward signal, second coupling means for coupling the output of said main amplifier to said second feed forward signal and for generating an output signal, first adjustment means for adjusting a relationship of at least one of an amplitude and a phase between said input signal and said first feed forward signal, and second adjustment means for adjusting a relationship of at least one of an amplitude and a phase between the output of said main amplifier and said second feed forward signal, the first adjustment means responsive to at least one of a first amplitude control signal and a first phase control signal, the second adjustment means responsive to at least one of a second amplitude control signal and a second phase control signal, said control circuit comprising:

• (a) distortion detection control means for generating at least one of said first amplitude control signal and said first phase control signal to make said second feed forward signal contain only a distortion element, the distortion element contained in the output of the main amplifier;
• (b) distortion elimination control means for generating at least one of said second amplitude control signal and said second phase control signal to eliminate the distortion element from said output signal;
• and
• (c) adding means for adding at least one of an amplitude offsets signal to said second amplitude control signal and a phase offset signal to said second phase control signal.

An amplifier comprising:

• (a) a main amplifier amplifying an input signal;
• (b) first coupling means for coupling an output of said main amplifier to a first feed forward signal and for generating a second feed forward signal;
• (c) second coupling means for coupling the output of said main amplifier to said second feed forward signal and for generating an output signal;
• (d) first adjustment means for adjusting a relationship of at least one of an amplitude and a phase between said input signal and said first feed forward signal, the first adjustment means responsive to at least one of a first amplitude control signal and a first phase control signal.
• (e) second adjustment means for adjusting a relationship of at least one of an amplitude and a phase between the output of said main amplifier and said second feed forward signal, the second adjustment means responsive to at least one of a second amplitude control signal and a second phase control signal;
• (f) distortion detection control means for generating at least one of said first amplitude control signal and said first phase control signal to make said second feed forward signal substantially contain only a distortion element, the distortion element contained in the output of the main amplifier;
• (g) distortion removal control means for generating at least one of said second amplitude control signal and said second phase control signal to substantially remove the distortion element from said output signal;
• and
• (h) first adding means for adding at least one of a first amplitude offset signal to said first amplitude control signal and a first phase offset signal to said first phase control signal.

An amplifier comprising:

• (a) a main amplifier amplifying an input signal;
• (b) first coupling means for coupling an output of said main amplifier to a first feed forward signal and for generating a second feed forward signal;
• (c) second coupling means for coupling the output of said main amplifier to said second feed forward signal and for generating an output signal;
• (d) first adjustment means for adjusting a relationship of at least one of an amplitude and a phase between said input signal and said first feed forward signal, the first adjustment means responsive to at least one of a first amplitude control signal and a first phase control signal;
• (e) second adjustment means for adjusting a relationship of at least one of an amplitude and a phase between the output of said main amplifier and said second feed forward signal, the second adjustment means responsive to at least one of a second amplitude control signal and a second phase control signal;
• (f) distortion detection control means for generating at least one of said first amplitude control signal and said first phase control signal to make said second feed forward signal contain only a distortion element, the distortion element contained in the output of the main amplifier;
• (g) distortion removal control means for generating at least one of said second amplitude control signal and said second phase control signal to remove the distortion element from said output signal;
• and
• (h) adding means for adding at least one of an amplitude offset signal to said second amplitude control signal and a phase offset signal to said second phase control signal.