Compensating apparatus and method for signal processing circuit

A compensating apparatus for a signal processing circuit, wherein said signal processing circuit is operative to receive an input signal and generate an output signal, said signal processing circuit including at least two circuit portions each having characteristics varying dependent upon at least one of a plurality of categories of circuit conditions, said plurality of categories of circuit conditions comprising a static circuit condition, a dynamic circuit condition and a circuit environmental condition, said compensating apparatus comprising:

• (a) correction data generating means for generating correction value data, said correction value data being adapted to be applied to said output signal generated from said signal processing circuit, in order to generate a compensated output signal that compensates for variations in the characteristics of each of said at least two circuit portions, wherein the correction value data is independent of characteristics of any circuit elements that receive the compensated output signal;
• and
• (b) correcting means provided externally to the signal processing circuit and connected to receive said output signal from said signal processing circuit and also connected to receive said correction value data from said correction data generating means, for correcting said output signal in accordance with said correction value data to generate the compensated output signal without accounting for any varying characteristics of any elements that receive the compensated output signal.

A signal processing apparatus for performing signal processing on an input signal applied to the signal processing apparatus, comprising:

• (a) a signal processing circuit coupled to receive said input signal for generating a circuit output signal, said signal processing circuit including first and second circuits each having characteristics varying dependent upon a dynamic circuit condition and a circuit environmental condition;
• (b) condition setting signal generating means for generating signals for setting values to said dynamic circuit condition of said first and second circuits;
• (c) sensing means for sensing values of said circuit environmental condition of said first and second circuits;
• (d) correction data generating means including first and second correction value tables for said first and second circuits, respectively, said first and second correction value tables each including at least one parameter associated with said dynamic circuit condition and at least one parameter associated with said circuit environmental condition, said correction data generating means being operative to retrieve and generate first and second correction values from said first and second correction value tables, respectively, in response to current values of said dynamic circuit conditions from said condition setting signal generating means and a current value of said circuit environmental condition from said sensing means;
• and
• (e) compensating means provided externally to the signal processing circuit and coupled to receive said circuit output signal from said signal processing circuit and also coupled to receive said first and second correction values from said correction data generating means for correcting said signal processing circuit output signal in accordance with said first and second correction values for said first and second circuits to provide an output signal generated by the signal processing apparatus.