Digital-to-analog converter with gain compensation

摘要: A digital-to-analog converter circuit (10) comprises a current switch (22) that has differential input conductors (16a, 16b, . , 16n and 18a, 18b, 18n) which receive complementary logic voltage signals corresponding to digital word (X 1 X 2 n ). The synthesizes an output signal (V o -V ) whose magnitude corresponds the weighted value of word. further reference source (60) develops (I REF from transistor constant-current sources (48a, 48b, 48n) in derive binary-weighted currents synthesize signal. includes impedance element or resistor (70) through flows is scaled load connected switch. compensates for gain dependence associated with effect Early β on transistors forming presence promotes, therefore, stable, uniform changes response incremental