Serial Receiver Loss Detection With Threshold-Based Signal Gating
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Solution Overview
Problem
Conventional serial communication devices, such as LVDS, face issues with poor power supply rejection ratios, high power consumption, and variations in gain and bandwidth across common mode voltage ranges, as well as inadequate detection of signals within specified threshold limits, leading to excess noise and power consumption.
Innovation Solution
The proposed solution involves a serial receiver design that includes a biasing circuit, sensing circuit, input stage, output stage, comparator, and a loss of signal detector. This design generates bias voltages, determines current source voltages, and uses a comparator to adjust operations, while the loss of signal detector identifies signals within specified threshold limits to prevent unnecessary processing and reduce noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LVDS serial devices are used, then serial communication functionality is achieved, but power supply rejection ratio is poor and power consumption is high
Solution Approach 1:
The patent implements dynamic biasing circuits that automatically adjust their operating points based on detected signal conditions. The biasing circuits transition between different states (active biasing during signal presence, reduced biasing during signal absence) to optimize both power consumption and power supply rejection ratio dynamically
Solution Approach 2:
The patent employs feedback mechanisms where the receiver detects the presence or absence of valid signals and uses this information to control the biasing circuits. This feedback loop enables the system to maintain high power supply rejection ratio when signals are present while reducing power consumption when signals are absent
2Reliability
If conventional serial devices operate continuously, then communication readiness is maintained, but power consumption increases and noise increases when signals are absent
Solution Approach 1:
The patent implements periodic signal detection and biasing adjustment cycles. The receiver continuously monitors for signal presence and periodically adjusts biasing levels accordingly, enabling the system to maintain detection capability while reducing continuous power consumption during idle periods
Solution Approach 2:
The biasing circuits are designed to automatically adjust their own operating parameters based on detected signal conditions without external intervention. The system self-regulates power consumption and noise levels by detecting signal presence and autonomously transitioning between operational states
3Loss of information
If continuous processing of received signals is performed, then no signal loss occurs, but power consumption increases and noise increases when signals are absent
Solution Approach 1:
The patent implements preliminary signal validation before full processing. The receiver first detects and validates the presence of legitimate signals using threshold-based detection, and only then activates full signal processing circuits. This preliminary action prevents unnecessary processing of absent or invalid signals, reducing noise and power consumption
Data Source
AI summary
An apparatus, device, and method for loss of signal detection in a receiver are provided. A reference circuit is operable to rectify a reference signal. An input circuit is operable to rectify an input signal. A comparator is operable to compare outputs of the reference circuit and the input circuit and to generate an output signal based on the comparison. The output signal indicates whether the input signal falls within threshold limits defined by the reference signal. A second reference circuit and a second input circuit could also be used, and the reference circuits and input circuits can be selectively enabled and disabled based on which of multiple differential pairs is enabled in a receiver receiving the input signal. The differential pairs can be used in the receiver to generate an output signal based on the input signal.