Optical Transceiver Circuit Compensation for Leakage-Affected Receiver Inputs
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Solution Overview
Problem
In transceiver circuits used in smartphones for controlling home appliances, electric leakage from transistors affects the accuracy of the receiver circuit, particularly in advanced processes like those below 28 nm, leading to inaccurate input and output issues.
Innovation Solution
A transceiver circuit design that includes a compensation circuit to provide a leakage path or compensation current for the differential amplifier's input terminals, reducing the impact of leakage currents by allowing them to flow to ground, thereby minimizing their effect on the receiver circuit's sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmitter circuit uses a transistor in advanced process (below 28 nm), then the integration and scaling are improved, but electric leakage occurs at microampere level affecting receiver accuracy
Solution Approach 1:
The patent segments the transceiver circuit into distinct transmitter and receiver portions with separate control mechanisms. The transmitter transistor is controlled by a drive circuit that can independently manage its state, while the receiver operates with dedicated input terminals not directly affected by transmitter leakage. This segmentation isolates the leakage problem to specific circuit portions.
Solution Approach 2:
The patent introduces an intermediary compensation circuit between the transmitter transistor and the receiver input terminals. This compensation circuit includes compensation transistors and current mirrors that actively counterbalance the leakage current effects. The intermediary circuit acts as a buffer that prevents direct transmission of leakage effects from the transmitter to the receiver.
2Measurement precision
If the transmitter transistor is kept off during receiver operation, then leakage is reduced, but time division multiplexing requires rapid switching affecting overall system responsiveness
Solution Approach 1:
The patent implements preliminary action by pre-configuring the compensation circuit to be ready counterbalance leakage currents before they significantly affect receiver operation. The compensation transistors are biased and prepared in advance, and the current mirror circuits are pre-established, so that when the transmitter switches states, the compensation mechanism is already in place to immediately counteract any leakage effects.
Solution Approach 2:
The patent maintains continuity of useful action by keeping the compensation circuit actively operating throughout both transmitter and receiver phases. Rather than completely disabling compensation mechanisms during switching transitions, the compensation circuit continuously monitors and counterbalances leakage currents, ensuring uninterrupted receiver functionality and maintaining system responsiveness throughout the time division multiplexing cycle.
Data Source
AI summary
A transceiver circuit includes a first interface and a second interface that are connected to an optical transceiver device, a receiver circuit, a transmitter circuit, and a compensation circuit. The receiver circuit includes a differential amplifier, where a first phase input terminal of the differential amplifier is coupled to the first interface, and where a second phase input terminal of the differential amplifier is coupled to the second interface. The transmitter circuit includes a first transistor, where a terminal of the first transistor is coupled to the second phase input terminal, and where another terminal of the first transistor is coupled to a ground terminal. The compensation circuit is configured to provide a leakage path for the first phase input terminal, or provide a compensation current for the second phase input terminal.