A half-rate random data phase detection circuit

Abstract

The invention relates to a half-rate random data phase detection circuit. By integrating the functions of a phase detector and a charge pump, the phase detection circuit works in a half-rate clock state, and generates a corresponding control voltage value according to the phase relationship between the input data and the clock. . A half-rate random data phase detection circuit proposed by the present invention is applied to the clock data recovery circuit of the delay phase-locked loop structure, and the optimized phase detection circuit makes the clock data recovery circuit work under the half-rate clock condition, which simplifies the circuit design complexity and power consumption. The phase detection circuit integrates the functions of the phase detector and the charge pump, and all of them are implemented by digital logic units, which reduces the hardware implementation cost of the entire clock data recovery circuit.

Description

technical field [0001] The invention relates to the technical field of phase detection, in particular to a half-rate random data phase detection circuit. Background technique [0002] Currently, data transfer rates are increasing as performance demands on transceiver systems continue to increase. In high-speed systems, noise both external and internal to the chip can significantly affect signal quality. In order to improve signal integrity, it is necessary to provide a clock at the receiving end of the transceiver with a well-determined phase relationship with the received data so that at the "sweet spot" of the data, that is, the midpoint of each bit sampling. This requires a clock data recovery circuit at the receiving end for clock recovery and data purification. [0003] A clock and data recovery (CDR) circuit based on a delay locked loop (Delay Locked Loop, DLL) uses a voltage controlled delay chain (Voltage Controlled Dealy Line, VCDL) instead of a voltage controlle...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to provide a corresponding detection circuit applied in a DLL structure CDR circuit, a half-rate phase detection circuit that can correctly detect the phase relationship between the periodic clock and random data, simplify the circuit complexity, The Key Issues of Reducing the Cost of Hardware Implementation

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