Quadrature Phase Shifter Using One DTC for Accurate 90° MOLO Shift
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Solution Overview
Problem
Current phase shifting technologies face challenges in accurately and efficiently generating phase-shifted wireless communication signals, particularly in achieving a precise 90° phase shift for modulated Local Oscillator (MOLO) signals without requiring additional Digital Time Converters (DTCs or polyphase filters.
Innovation Solution
A phase shifter is implemented using a quadrature phase-shift generator that generates phase-shifted signals by manipulating MOLO signals, achieving a 90° phase shift relative to the MOLO cycle using a single DTC and precise digital-RFIC, without the need for additional DTCs or polyphase filters, and supports a wide range of phase shifts for various input frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional Digital Time Converters (DTCs) or polyphase filters are used to achieve precise phase shifting, then phase shift accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple phase shifting functions into a single Digital Time Converter (DTC) by using a shared delay element that can be controlled to produce different phase shifts. Instead of using separate DTCs or polyphase filters for each phase shift requirement, the invention merges these functions into one reconfigurable unit that can dynamically adjust its delay to achieve the desired phase relationship between signals.
Solution Approach 2:
The patent creates a universal phase shifting mechanism where a single DTC can perform multiple phase shift operations for different signal paths and frequencies. The delay element is designed to be controllable and reconfigurable, allowing it to serve as a multi-functional component that replaces what would traditionally require multiple specialized components for different phase shifting requirements.
2Measurement precision
If additional Digital Time Converters (DTCs) or polyphase filters are used to achieve precise phase shifting, then phase shift accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple phase shifting functions into a single Digital Time Converter (DTC) by using a shared delay element that can be controlled to produce different phase shifts. Instead of using separate DTCs or polyphase filters for each phase shift requirement, the invention merges these functions into one reconfigurable unit that can dynamically adjust its delay to achieve the desired phase relationship between signals.
Solution Approach 2:
The patent creates a universal phase shifting mechanism where a single DTC can perform multiple phase shift operations for different signal paths and frequencies. The delay element is designed to be controllable and reconfigurable, allowing it to serve as a multi-functional component that replaces what would traditionally require multiple specialized components for different phase shifting requirements.
3Device complexity
If a single Digital Time Converter is used to generate phase-shifted signals, then device complexity is reduced, but achieving accurate phase shift across wide frequency ranges becomes difficult
Solution Approach 1:
The patent implements a dynamic delay element within the single DTC that can adjust its delay value based on the input signal frequency. This dynamic characteristic allows the phase shifter to maintain accurate phase relationships across a wide frequency range, as the delay can be optimized for each frequency rather than being fixed for a narrow band.
Solution Approach 2:
The patent changes the delay parameter of the DTC based on the operating frequency to maintain accurate phase shifting across wide frequency ranges. By making the delay parameter adjustable and frequency-dependent, the system achieves broad adaptability while still using only a single DTC, thus maintaining low device complexity.
Data Source
AI summary
For example, a phase shifter may include an input to receive an input clock signal having an input frequency and an input phase. For example, the phase shifter may include a quadrature phase-shift generator configured to generate a first signal and a second signal based on the input clock signal, the first and second signals having the input frequency, wherein a phase of the first signal is based on the input phase, wherein a phase of the second signal is shifted by a quadrature phase-shift relative to the phase of the first signal. For example, the phase shifter may include an output to provide an output based on the first signal and the second signal.