Duplex Signal Crosstalk Reduction via Nonlinear Amplifier Harmonics
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Solution Overview
Problem
Existing duplex signal communication channels face challenges in reducing crosstalk between paired signal transmission lines while enabling simultaneous transmission and reception of data at a common frequency, without introducing significant circuit complexity.
Innovation Solution
The solution involves driving a first amplifier into a nonlinear region of operation to transmit a first data signal on the first signal transmission line at a multiple of a common clock frequency, while a second amplifier transmits a second data signal on the second signal transmission line at the common clock frequency, utilizing frequency divider circuits for reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If different frequencies are utilized to communicate data on different signal transmission lines, then crosstalk is reduced, but circuit design complexity increases due to multiple clock signals
Solution Approach 1:
The patent changes the frequency parameter of one signal transmission line by driving an amplifier into a nonlinear region, generating harmonics (e.g., 2x, 3x clock frequencies) that naturally separate the frequency spectra of paired channels. This frequency separation reduces crosstalk without requiring multiple independent clock sources, thereby avoiding the complexity penalty of traditional frequency division approaches
2Object-affected harmful factors
If time-based multiplexing is implemented to reduce crosstalk, then crosstalk is eliminated, but bandwidth is reduced by 50%
Solution Approach 1:
The patent employs periodic frequency multiplication through nonlinear amplifier operation, where the amplifier naturally generates harmonic frequencies (2x, 3x, etc.) of the input clock signal. This periodic frequency generation allows simultaneous transmission on both channels at different effective frequencies, eliminating crosstalk while maintaining full bandwidth utilization without time multiplexing restrictions
3Productivity
If simultaneous transmit and receive is implemented at a common frequency, then bandwidth is maintained, but circuit complexity increases due to crosstalk cancellation requirements
Solution Approach 1:
The patent modifies the frequency parameter by exploiting the nonlinear region of amplifier operation to generate harmonic frequencies. This natural frequency separation (e.g., one channel at 2x clock frequency, another at clock frequency) allows simultaneous full-duplex communication at effectively different frequencies without requiring complex active crosstalk cancellation circuits, feed-forward topologies, or additional compensation hardware
Data Source
AI summary
A duplex signal communication channel includes first and second signal transmission lines. While a first amplifier coupled to the first signal transmission line is driver into a nonlinear region of operation, a first data signal is transmitted by the first amplifier on the first signal transmission line. The first data signal is transmitted at a multiple of a common clock frequency. A second amplifier coupled to the second signal transmission line transmits a second data signal on the second signal transmission line concurrently with the first data signal, but does so at the common clock frequency. A first receiver circuit receives the first data signal on the first signal transmission line, and a second receiver circuit receives the second data signal on the second signal transmission line. Receiving the first data signal includes extracting the first data signal from the first signal transmission line utilizing a frequency divider circuit.