LVDS Half-Duplex Transceiver Pre-Driver for High-Frequency Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional half-duplex transceivers face challenges in efficiently transferring high-frequency data signals due to limitations in power application and complexity in pre-driver configurations, leading to inefficiencies and increased current consumption in low-voltage differential signaling systems.
Innovation Solution
A low-voltage differential signaling transceiver system with a pre-driver and output driver configuration that uses NMOS and PMOS transistors to regulate current flow and shift reference voltage levels, enabling efficient high-frequency data communication between circuit module chips by serially connecting pre-drivers and output drivers with input drivers, and utilizing a simplified circuit architecture that requires only a single pair of differential signals from the signal source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional current-mode transceivers are used for high-frequency data communication, then data transmission capability is achieved, but current consumption increases significantly
Solution Approach 1:
The patent changes the operating parameters by switching from current-mode to voltage-mode differential signaling. The transmitter uses PMOS and NMOS transistors to generate differential voltage signals that swing between rail-to-rail levels, while the receiver uses a transimpedance amplifier to convert these voltage signals back to current for processing. This parameter change enables high-frequency communication with significantly reduced current consumption compared to conventional current-mode transceivers.
2Use of energy by moving object
If conventional low-voltage differential signaling transceivers are used, then power consumption is reduced, but high-frequency data communication capability is compromised
Solution Approach 1:
The patent introduces dynamic elements including a variable gain amplifier in the receiver that can adjust its amplification factor based on signal conditions, and a transimpedance amplifier that dynamically converts voltage to current. The transmitter uses dynamic switching of PMOS and NMOS transistors to generate differential signals. These dynamic components enable the system to maintain high-frequency communication capability while operating at low voltage and consuming reduced power.
3Adaptability or versatility
If duplex low-voltage differential signaling transceivers are used, then bidirectional communication is enabled, but circuit complexity increases
Solution Approach 1:
The patent implements a universal transceiver architecture where the same circuit components can perform both transmission and reception functions. The transmitter generates differential voltage signals that can be received by the receiver, and the receiver's transimpedance amplifier can also process signals in reverse. The variable gain amplifier and transimpedance amplifier serve multiple functions in the bidirectional communication process, reducing the need for separate dedicated circuits for each direction and thereby simplifying the overall architecture.
4Reliability
If terminal resistors are connected in parallel to transmission lines, then signal reflection is prevented, but current consumption increases
Solution Approach 1:
The patent extracts and removes the parallel terminal resistors from the transmission line configuration. Instead of using resistive termination that draws continuous current, the system employs active impedance matching through the transimpedance amplifier and variable gain amplifier. These active components provide the necessary signal termination and reflection prevention functions while consuming significantly less power than passive resistive termination would require.
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 achieves efficient high-frequency data communication with reduced current consumption and simplified circuit architecture, effectively addressing the limitations of conventional systems by ensuring synchronized operation and adequate power levels for data transfer.
Implementation Method 1
a first transistor connected between a first input terminal and the output driver. The first transistor regulates an amount of current flowing from a first output node connected thereto to a sink node connected thereto based on a potential of a differential data signal on a first input line connected to the first transistor
Implementation Method 2
a pre-driver configured to shift a reference voltage level of differential data signals input thereto from the input terminals and to be supplied to the output driver therefrom
Data Source
AI summary
A half-duplex communication system may include one or more low-voltage differential signaling half-duplex transceivers. Each transceiver may include a plurality of input terminals receiving a plurality differential data signals, an input driver transferring the differential data signals from differential transmission lines through output terminals, and an output driver transferring the differential data signals from the input terminals through the differential transmission lines and out to one of the first and second transceivers via the non-inverse and inverse transmission lines. The differential data signals may be transferred in response to the differential data signals at the input terminals and at the output terminals of the input driver. Each transceiver may include a pre-driver configured to shift a reference voltage level of differential data signals input thereto from the input terminals and which are to be supplied to the output driver therefrom.