Half-Rate Data Retiming Circuit With Hybrid CMOS-Bipolar Layout
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Solution Overview
Problem
Integrated circuits face challenges in reducing power consumption while maintaining high-speed performance, as CMOS technology is limited by noise performance and speed, leading to unnecessary voltage drops and increased power overhead, making BiCMOS technology more power-hungry but necessary in some cases.
Innovation Solution
A hybrid data retiming circuit incorporating both CMOS and bipolar transistors, where CMOS transistors operate at lower frequencies for current references and bipolar transistors handle higher-frequency data and clock signals, minimizing voltage drops and optimizing power efficiency through a phase locked loop with a voltage-controlled oscillator and half-rate mode operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If CMOS technology is used to reduce power consumption, then power consumption is reduced, but speed performance and noise performance deteriorate
Solution Approach 1:
The circuit is divided into two distinct segments: a CMOS section for generating current references and biasing signals (low-frequency operations), and a bipolar section for processing data and clock signals (high-frequency operations). This segmentation allows each technology to operate in its optimal performance range, with CMOS providing power efficiency for control functions and bipolar providing speed for data processing.
Solution Approach 2:
Different technology types are applied to different functional areas of the circuit based on local requirements. The CMOS technology is used locally for power-efficient current generation and biasing, while bipolar technology is used locally for high-speed signal processing. This local quality approach ensures that each part of the circuit uses the most appropriate technology for its specific function.
2Speed
If BiCMOS technology is used to achieve high speed performance, then speed performance is improved, but power consumption increases
Solution Approach 1:
The circuit functionality is segmented between CMOS and bipolar technologies, with CMOS handling power-efficient control functions and bipolar handling high-speed data processing. This segmentation eliminates the need for full BiCMOS implementation, reducing overall power consumption while maintaining high-speed performance where it is actually needed.
Solution Approach 2:
The invention changes the operational parameters by having CMOS transistors operate at lower frequencies for current references while bipolar transistors handle higher-frequency data signals. This parameter differentiation allows the system to achieve high-speed performance only where necessary, rather than throughout the entire circuit, thereby reducing overall power consumption.
3Speed
If circuit is optimized for performance, then speed performance is improved, but voltage drops increase leading to larger voltage overhead
Solution Approach 1:
The invention optimizes voltage utilization by having CMOS transistors operate at lower frequencies with correspondingly lower voltage requirements for current reference generation, while bipolar transistors handle high-frequency data processing with appropriate voltage levels. This parameter optimization reduces unnecessary voltage drops across the circuit, lowering the overall voltage overhead requirement while maintaining high-speed performance where needed.
Data Source
AI summary
A low power data retiming circuit incorporates CMOS components in certain sections that operate at a lower frequency in comparison to certain other sections that use components based on bipolar technology for operating at a relatively higher frequency. The data retiming circuit includes a clock recovery circuit wherein a voltage controlled oscillator provides a recovered clock to a clock generator circuit for generating a latched clock that is provided to a phase detector and a data serializer. The data serializer operates as a synchronous multiplexer for generating a retimed data output signal from a pair of latched data input signals. The phase detector and the data serializer operate in a half-rate mode wherein high and low voltage levels of the latched clock are used for clocking data. The half-rate mode of operation permits the use of a clock frequency that is half that of an input data rate.