Biphase Mark Coding Transceiver with Time-Multiplexed Op-Amp
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Solution Overview
Problem
Conventional Biphase Mark Coding (BMC) transceivers face issues due to the interaction between digital and analog circuits, leading to power supply switching noise and high power consumption, as well as a large chip area occupation, due to the difference in circuit natures and the use of multiple clocks for adjusting rising/falling edges.
Innovation Solution
A BMC transceiver is designed with an operational amplifier circuit operating in a time division multiplexing manner, utilizing a mode switching switch group to configure the operational amplifier as either a transmitter or receiver, allowing for adjustable rising/falling edges by changing the bias current, thus simplifying the circuit and reducing power consumption and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate digital and analog circuits are used for BMC transmitter and receiver, then circuit functionality is achieved, but power supply switching noise increases and chip area occupation increases
Solution Approach 1:
The patent merges the digital BMC transmitter and analog BMC receiver into a single integrated circuit module. The operational amplifier circuit performs both transmission and reception functions, eliminating the need for separate digital and analog circuits. This integration reduces power supply switching noise and minimizes chip area occupation while maintaining full circuit functionality.
2Manufacturing precision
If multiple clocks with equal interval are used to adjust rising/falling edges, then edge timing control is achieved, but power consumption increases and chip area occupation increases
Solution Approach 1:
The patent changes the operational parameter from using multiple equal-interval clocks to using a single clock with adjustable duty cycle. By varying the duty cycle parameter of one clock signal, the circuit achieves precise control over rising and falling edges without requiring multiple clock sources. This approach significantly reduces power consumption and simplifies the circuit architecture.
3Manufacturing precision
If multiple buffers are used for data transmission, then rising/falling edges can be controlled, but chip area occupation increases
Solution Approach 1:
The patent makes the operational amplifier circuit universal by enabling it to perform both transmission and reception functions. The same operational amplifier is configured differently based on operating mode, eliminating the need for separate transmitter and receiver circuits. This multi-functionality approach maintains precise waveform edge control while minimizing chip area occupation.
4Reliability
If digital and analog circuits are isolated in layout, then circuit interference is reduced, but device complexity increases
Solution Approach 1:
The patent combines digital and analog functions into a single integrated operational amplifier circuit, eliminating the need for physical separation in layout. The unified circuit architecture inherently reduces interference while simplifying the overall device complexity. Power supply switching noise is minimized through the integrated design rather than through complex isolation techniques.
Data Source
AI summary
A Biphase Mark Coding (BMC) transceiver is provided. In the BMC transceiver, an operational amplifier operating in a time division multiplexing manner is used. The operational amplifier is configured as a unity gain buffer, and it is determined whether the BMC transceiver operates as a transmitter or a receiver by selecting different input switches and output switches. In a transmitting mode, a bias current of an input differential pair transistor of the operational amplifier is changed, to change a slew rate, so as to obtain an output waveform with adjustable rising/falling edges of the transmitter.