Mixed-signal circuitry and integrated circuit devices

摘要

A mixed-signal integrated circuit device comprises a digital circuitry portion (DIGITAL) including digital circuitry (10) and an analog circuitry portion (ANALOG) including analog circuitry (14). The digital circuitry produces plural first digital signals (T1-Tn). The analog circuitry produces one or more analog signals (OUTA, OUTB) in dependence upon received second digital signals (TCK1-TCKn). The device also comprises a signal control circuitry portion (LATCH) including signal control circuitry which derives the second digital signals (TCK1-TCKn) from the first digital signals (T1-Tn) and controls the timing of application of the second digital signals to respective inputs of the analog circuitry. To avoid jitter in the second digital signals arising from power supply loading changes, power is supplied independently to each of the circuitry portions (DIGITAL, LATCH and ANALOG). Other improvements to the design of the signal control circuitry to reduce jitter are also disclosed (Figures 13 and 14). <IMAGE>