Digital Delay-Cell Phase Modulator for Fast PVT-Stable Shifting
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Solution Overview
Problem
Current phase modulation systems in millimeter wave wireless communications face challenges with process, voltage, and temperature variations, leading to increased settling time and sensitivity to PVT changes, which affects the accuracy and efficiency of phase shifting operations.
Innovation Solution
The implementation of a phase modulator using an artificial transmission line with cascading delay cells that apply simultaneous digital bits to achieve instantaneous phase shift, reducing settling time and enhancing robustness against PVT variations, while maintaining low insertion loss and dispersion-free propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phase modulation systems are used, then the system can operate in millimeter wave wireless communications, but the settling time increases and sensitivity to PVT variations increases
Solution Approach 1:
The phase modulation system is segmented into multiple independent delay cells (first delay cell, second delay cell, etc.) that can be individually controlled. Each delay cell processes a portion of the phase shift requirement, allowing parallel operation and reducing the overall settling time while maintaining phase accuracy through coordinated control of all segments.
Solution Approach 2:
The delay cells are pre-configured with predetermined delay values that correspond to specific phase shift amounts. This preliminary configuration allows the system to instantly apply the required phase shift by simply selecting the appropriate pre-calibrated delay cell, eliminating the need for gradual adjustment and reducing settling time.
2Reliability
If conventional phase modulation systems are used, then the system can perform phase shifting operations, but sensitivity to process, voltage, and temperature variations increases
Solution Approach 1:
The system changes the control parameter from continuous analog phase adjustment to discrete digital delay cell selection. By using digitally controlled delay cells with predetermined delay values, the phase modulation becomes less sensitive to analog PVT variations while maintaining accurate phase shift control through digital selection of the appropriate delay cell.
Solution Approach 2:
Each delay cell is designed to automatically compensate for PVT variations through its inherent delay characteristics. The delay cells are configured such that their delay values are relatively stable against PVT changes, allowing the system to maintain phase accuracy without requiring external compensation mechanisms.
3Reliability
If artificial transmission line with cascading delay cells is used, then settling time decreases and PVT robustness increases, but device complexity increases
Solution Approach 1:
Multiple delay cells are merged into a unified artificial transmission line structure where the output of one delay cell feeds into the next. This combining approach achieves complex phase modulation functionality through the coordinated operation of simpler individual delay cells, reducing overall system complexity while maintaining high phase accuracy and PVT robustness.
Data Source
AI summary
In a phase modulation method enable signals may be sequentially generating based on a clock signal to generate a sequence of enable signals, and a signal is delayed by delay values generated from delay cells based on the sequence of enable signals and digital bit values. A phase modulator may include a first delay circuit configured to: delay a clock signal based on a first delay value to generate a first delayed clock signal, and delay a carrier signal based on the first delayed clock signal to generate a first delayed carrier signal; and a second delay circuit configured to: delay the first delayed clock signal based on a second delay value to generate a second delayed clock signal, and delay the first delayed carrier signal based on the second delayed clock signal to generate a second delayed carrier signal.