Slice Reference Switching for Burst Data Signal Gaps
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Solution Overview
Problem
Conventional slice level reference generation circuits in radio receivers face difficulties in maintaining a stable reference signal during signal gaps, leading to noise generation and distorted data recovery at the beginning of subsequent signal bursts.
Innovation Solution
A receiver circuit that applies a nominal reference signal during signal gaps, using a switch and control circuit to selectively transmit either the slice level reference signal or a predetermined nominal reference signal to the comparator, ensuring a stable reference during data bursts and minimizing noise and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slice level detector is used to generate a dynamic reference signal that adjusts to signal strength, then conversion reliability for both weak and strong signals is improved, but during signal gaps the reference signal decays to zero causing noise and distortion in subsequent bursts
Solution Approach 1:
The patent applies a predetermined nominal reference signal to the comparator during signal gaps before the actual signal burst arrives. This preliminary action prevents the reference signal from decaying to zero during gaps, thereby avoiding noise and distortion when the next signal burst begins, while still allowing dynamic reference adjustment during active signal periods
Solution Approach 2:
The patent dynamically switches between two reference signal modes: using the predetermined nominal reference signal during signal gaps and using the dynamically adjusted slice level reference signal during signal bursts. This dynamic approach allows the system to adapt its reference signal strategy based on the presence or absence of incoming signals, resolving the contradiction between maintaining reliability during gaps and avoiding noise during bursts
Data Source
AI summary
A slice level reference generator and method for performing improved data slicing operations when gaps are present in a data stream is disclosed that involves applying a nominal reference signal to the comparator the during signal gaps. In one embodiment, a receiver circuit includes a slice level detector and a comparator that operate in a conventional manner, and control circuitry that utilizes a signal detector and a switch to store a slice level reference signal generated by the slice level detector during a first signal burst, and to apply the stored reference signal to the comparator during signal gaps. In one embodiment a timer circuit is used to detect signal gaps. In another embodiment a predetermined fixed reference signal is applied to the comparator during signal gaps.