Negative Resistance Amplifier for Differential Signal Bandwidth Extension
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Solution Overview
Problem
High-speed data signals experience distortion and errors due to high-frequency losses in transmission lines, which increase with signal frequency and path length, necessitating methods for extending usable bandwidth.
Innovation Solution
The implementation of fully differential amplifiers capacitively coupled with AC capacitors on signal paths, and the use of negative resistance circuits in RF multiplexers to enhance bandwidth by allowing higher frequency signals to pass through and providing positive feedback, thereby reducing losses and errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed data signals are transmitted over signal paths, then data transfer speed increases, but signal distortion and errors increase due to high-frequency losses
Solution Approach 1:
The patent converts the harmful high-frequency losses into beneficial effects by using them to generate feedback signals. The losses that normally distort the signal are instead utilized to create error signals that drive correction mechanisms, transforming the harmful distortion into a useful feedback mechanism for signal recovery and bandwidth extension.
Solution Approach 2:
The patent implements feedback mechanisms where the output signal is fed back through the transmission line to generate error signals. These feedback signals are processed to create correction signals that compensate for the high-frequency losses, allowing the system to maintain signal integrity at higher frequencies and extend the usable bandwidth of the transmission line.
2Length of stationary object
If signal path length increases, then transmission distance increases, but signal losses increase causing more distortion and errors
Solution Approach 1:
The patent introduces intermediary feedback paths and correction circuits that act as mediators between the transmitted signal and the received signal. These intermediary elements process the signal through multiple stages, with each stage compensating for losses accumulated in previous stages, thereby enabling signals to traverse longer distances without excessive degradation.
Solution Approach 2:
The patent implements continuous feedback and correction mechanisms that operate throughout the entire signal transmission process. Rather than applying correction only at the end, the system continuously monitors and corrects signal degradation along the transmission path, maintaining signal quality throughout the extended distance.
3Speed
If data signal frequency increases, then data rate increases, but high-frequency losses increase causing signal distortion
Solution Approach 1:
The patent converts the harmful high-frequency losses into beneficial feedback signals. By intentionally feeding back the lost high-frequency components through controlled paths, the system recovers these frequencies and uses them to correct the original signal, thereby extending the usable bandwidth into higher frequency ranges where traditional systems would experience excessive loss.
Solution Approach 2:
The patent changes the electrical parameters of the transmission system by introducing active feedback circuits that modify the effective impedance and loss characteristics of the transmission line. This parameter transformation allows the system to operate at higher frequencies by dynamically compensating for frequency-dependent losses through controlled parameter adjustments in the feedback paths.
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
This approach effectively extends the bandwidth of signal transmission by reducing distortion and errors, enabling the reliable transfer of high-speed data over longer distances with improved signal integrity.
Implementation Method 1
providing positive feedback, thereby reducing losses and errors
Implementation Method 2
fully differential amplifiers capacitively coupled with AC capacitors on signal paths
Data Source
AI summary
Systems, apparatuses, and methods for implementing a negative resistance circuit for bandwidth extension are disclosed. Within a feedback path of a differential signal path, capacitors are placed on the inputs and outputs of a fully differential amplifier connecting to the differential signal path. In one embodiment, a circuit includes a fully differential amplifier and four capacitors. A first capacitor is coupled between a first signal path and a non-inverting input terminal of the amplifier and a second capacitor is coupled between the first signal path and a non-inverting output terminal of the amplifier. A third capacitor is coupled between a second signal path and an inverting input terminal of the amplifier and a fourth capacitor is coupled between the second signal path and an inverting output terminal of the amplifier. The first and second signal paths carry a differential signal.