| 摘要 |
<p>A differential input circuit has an input stage with a pair of differentially biased input transistors (Q1,Q2) connected to supply current through respective load impedances (R1,R2), and a gain stage with a second pair of transistors (Q3,Q4) connected to supply additional currents to the load impedances (R1,R2) to keep the impedance currents constant over variations in the input voltage levels. A cross-coupled cascode circuit (Q8,Q9,6,8) connected between the gain stage transistors (Q3,Q4) and the load impedances (R1,R@) compensates for inaccuracies in the load impedance currents which occur during dynamic operation of the circuit, and thus enhances gain, linearity and the current transfer efficiency between the two stages. <IMAGE></p> |
