Latch Error Compensation Circuit for Stable Phase Synchronization
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Solution Overview
Problem
Conventional phase synchronization methods using feedback circuits for television signals, such as SDI signals, suffer from delays and instability due to the presence of feedback loops, which can cause phase jitter and require complex circuit configurations.
Innovation Solution
The implementation of a phase synchronization method using two latch circuits that compensate for latch errors by selecting the optimal latch signal based on detected errors, eliminating the need for feedback circuits and simplifying the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is used to delay the external frame sync signal for phase synchronization, then phase synchronization accuracy is improved, but circuit complexity and delay increase
Solution Approach 1:
The patent extracts and eliminates the feedback control loop from the phase synchronization system. Instead of using feedback to detect and correct phase jitter, the invention uses a single latch that directly latches the external frame sync signal in response to the parallel clock signal. This removal of the feedback mechanism simplifies the circuit while maintaining synchronization accuracy through proper timing design.
Solution Approach 2:
The patent applies preliminary action by designing the latch timing parameters (setup time, hold time, and clock-to-output delay) in advance to pre-compensate for phase differences. The latch is configured with specific timing characteristics that proactively account for expected phase jitter ranges, eliminating the need for reactive feedback correction and reducing overall circuit complexity.
2Measurement precision
If feedback loops are used for phase synchronization, then synchronization accuracy is improved, but stability deteriorates due to phase jitter
Solution Approach 1:
The patent removes the feedback loop entirely from the synchronization system. By using a forward-only latch operation without feedback, the system eliminates the source of instability that arises from feedback-induced phase jitter. The single latch structure provides inherent stability while achieving synchronization through proper timing design rather than iterative feedback correction.
3Measurement precision
If delay elements are used in the feedback loop for jitter correction, then phase synchronization is improved, but response time increases
Solution Approach 1:
The patent incorporates preliminary action by pre-configuring the latch timing parameters to account for phase differences before they occur. The setup time, hold time, and clock-to-output delay are designed in advance to handle expected jitter ranges, allowing the system to achieve synchronization immediately without requiring iterative delay adjustments and feedback operations.
Solution Approach 2:
By removing the feedback loop with its delay elements, the patent eliminates the time penalty associated with iterative jitter correction. The system achieves synchronization in a single latch operation rather than through multiple feedback cycles, significantly reducing response time while maintaining synchronization accuracy.
Data Source
AI summary
A latch is provided for rapidly stabilizing a latching operation. The latch comprises a first latch circuit for latching a first signal in response to a first portion of a second signal to generate a first latch signal, and a latch error compensator for compensating a latch error in the first latch signal generated by the first latch circuit to generate a compensated latch signal.