Patent ID: 6121830
Filing Date: 2000-09-19
Classification: H03G

Abstract:
A programmable integrated amplifier circuit comprising at least one programmable current amplifier wherein the gain of said at least one programmable current amplifier is determined on the basis of the value of a certain control signal, and wherein said circuit further comprises:offset current generating means for generating an offset current according to the value of said certain control signal in inverse proportion to the gain of said at least one programmable current amplifier;summing means, arranged to add said offset current to a current signal, for forming an input to said at least one programmable current amplifier; andmeans, responsive to a change in said certain control signal which causes the gain of said at least one programmable current amplifier to increase, for causing the offset current generated by the offset current generating means to decrease, and responsive to a change in said certain control signal which causes the gain of said at least one programmable current amplifier to decrease, for causing the offset current generated by the offset current generating means to increase.