Differential Latch Receiver With Bandgap-Stable Voltage Threshold
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Solution Overview
Problem
Existing signal isolator devices face challenges in maintaining stable voltage thresholds in noisy environments, leading to data errors due to electro-magnetic transients and common mode voltage movements, which are difficult to control over process and temperature variations.
Innovation Solution
A differential receiver system with a cross-coupled latch and offset structure using current mode logic (CML) gates and a bandgap circuit to maintain stable voltage thresholds, comprising a current source and offset resistor, which keeps the voltage threshold stable across temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a differential receiver uses cross-coupled latch circuits to detect differential pulses, then the response speed to picosecond pulses is improved, but the voltage threshold becomes unstable in noisy environments with electro-magnetic transients
Solution Approach 1:
An offset structure is introduced as an intermediary element between the differential input signals and the latch circuits. This offset structure includes offset current sources that are coupled to the differential input signals and are configured to maintain a stable voltage threshold. The offset structure acts as a mediator that stabilizes the threshold voltage against noise and electro-magnetic transients while allowing the fast latch circuits to respond to differential pulses.
Solution Approach 2:
The patent changes the parameter of voltage threshold stability by introducing offset current sources with specific biasing arrangements. The offset current sources are designed to provide a stable reference level that compensates for variations in the differential input signals. By adjusting and controlling the offset current parameters, the system maintains a stable voltage threshold while preserving fast response characteristics.
2Measurement precision
If the voltage threshold is set to detect differential pulses accurately, then data transmission precision is improved, but the threshold moves due to common mode voltage movements and electro-magnetic transients causing data errors
Solution Approach 1:
The offset structure serves as an intermediary that isolates the threshold detection mechanism from harmful external factors. The offset current sources create a stable reference level that is less susceptible to common mode voltage movements and electro-magnetic transients. This intermediary structure protects the threshold detection from noise while maintaining accurate data transmission precision.
Solution Approach 2:
The offset structure applies preliminary anti-action by pre-compensating for the effects of noise and electro-magnetic transients. The offset current sources are configured to counteract threshold movements before they can cause data errors. This preliminary compensation stabilizes the voltage threshold against anticipated disturbances, preventing data transmission errors.
3Stability of the object's composition
If the offset structure uses bandgap circuit to maintain stable voltage threshold, then threshold stability over temperature is improved, but the device complexity increases
Solution Approach 1:
The patent employs a bandgap circuit to stabilize the voltage threshold by utilizing the temperature-independent properties of bandgap voltage references. The bandgap circuit changes the thermal parameters of the system by providing a reference voltage that remains stable across temperature variations. This approach maintains threshold stability while managing the inherent complexity through established circuit design techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system rapidly responds to picosecond differential pulses, ensuring accurate setting and resetting of the differential state machine with stable thresholds in noisy environments, reducing data errors and maintaining stability over process and temperature variations.
Implementation Method 1
a first current source includes a bandgap circuit to flow an offset current through the offset resistor to maintain the voltage threshold at the stable voltage level
Data Source
AI summary
Methods and apparatus for a differential receiver having a differential latch. The latch can include first and second circuits each having first and second inputs to receive a differential input signal and first and second outputs to output a differential output signal. An offset structure includes a bandgap reference circuit with a first current source and a resistor, wherein the offset compensation structure provides a stable threshold for an input signal on the first and second inputs.