Programmable CTLE Circuit for Independent DC and Equalizer Gain
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Solution Overview
Problem
Wide band data communication systems require multiple stages of signal processing, including equalization and amplification, which often necessitate the use of intermediate buffers that consume excessive power, especially in low-voltage systems, making a design with fewer buffer blocks more favorable.
Innovation Solution
A continuous time linear equalization (CTLE) circuit with switchable degenerative impedance circuits between differential transistor pairs, allowing for independent control of DC and equalizer gains without additional gain stages, reducing noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple stages of signal processing with intermediate buffers are used, then signal equalization and amplification are achieved, but power consumption increases
Solution Approach 1:
The patent combines multiple signal processing functions (equalization, amplification, and re-driving) into a single integrated CTLE stage. The continuous-time linear equalization circuit incorporates both equalization and amplification capabilities in one stage, eliminating the need for separate intermediate buffer stages while maintaining signal integrity and reducing overall power consumption.
Solution Approach 2:
The CTLE circuit performs multiple functions simultaneously: it provides continuous-time linear equalization, signal amplification, and re-driving capability in a single stage. This multi-functional design replaces what would traditionally require multiple separate stages and intermediate buffers, thereby reducing power consumption while maintaining reliable signal processing.
2Ease of operation
If additional gain stages are added, then DC gain control is improved, but device complexity and noise increase
Solution Approach 1:
The patent implements dynamic control of DC gain within the single CTLE stage through programmable gain control. The circuit can adjust its DC gain level dynamically without requiring additional static gain stages, allowing flexible adaptation to different signal conditions while maintaining a compact single-stage architecture that reduces complexity and noise.
Data Source
AI summary
A continuous time linear equalization (CTLE) circuit is disclosed. The CTLE circuit includes an input port, an output port, a first differential transistor pair coupled to the input port and the output port and a second differential transistor pair. The CTLE circuit further includes a first degenerative impedance circuit coupled between the first differential transistor pair and ground. The first degenerative impedance includes switchable components to vary impedance of the first degenerative impedance circuit. The CTLE circuit also includes a second degenerative impedance circuit coupled between the second differential transistor pair and ground. The second degenerative impedance includes switchable components to vary impedance of the second degenerative impedance circuit, wherein the resistive part of the impedance of the first degenerative impedance circuit is equal to the impedance of the second degenerative impedance circuit.