Predriver Equalization Circuit for Serial Transmitter Jitter Reduction

The equalization function is segmented into two distinct parts: predriver equalization (first equalization process) and driver equalization (second equalization process). The predriver circuit includes multiple paths with different delay characteristics to address predriver-induced jitter, while the driver circuit handles channel-induced jitter. This segmentation allows each part to be optimized independently for its specific function, improving overall power efficiency and jitter reduction performance.

The predriver circuit uses multiple paths with different delay parameters (first path delay, second path delay) and different driving strengths to optimize signal quality. By adjusting these delay parameters and combining signals at the summing node, the system achieves better jitter reduction and signal integrity, enabling higher data rates and improved throughput without proportionally increasing power consumption or requiring additional transceiver channels.

The predriver circuit with multiple delay paths serves multiple functions: it provides signal conditioning, jitter reduction, and equalization for the serial link. This multi-functional design improves throughput performance while occupying minimal additional area, as the same predriver structure serves both signal generation and equalization purposes, eliminating the need for separate dedicated equalization hardware for each transceiver.