Parallel Voltage-Mode Phase Interpolator for Low-Power Clock Mixing
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Solution Overview
Problem
Conventional phase interpolators require high current for high-speed signal switching, leading to increased power consumption and cost, especially when used in high-speed circuits, and are limited to sinusoidal input signals.
Innovation Solution
A phase interpolator design utilizing a phase adjusting circuit with parallel first and second phase adjusting modules, employing MOS transistors and switch tubes to generate an interpolation signal by mixing clock signals with the same frequency but different phases, allowing for phase adjustment under lower voltage, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional current steering phase interpolator is used for high-speed signal switching, then switching speed is improved, but power consumption increases due to larger current requirement
Solution Approach 1:
The patent changes the operating parameter from current-based switching to voltage-based switching. The phase interpolator circuit uses voltage signals instead of current signals to control the switching operation, which significantly reduces power consumption while maintaining high-speed performance. The voltage mode operation allows fast switching without requiring large currents.
Solution Approach 2:
The patent replaces the conventional current steering mechanism with a voltage mode switching mechanism. Instead of using current sources and current switches, the invention employs voltage-controlled switches and resistive networks to achieve phase interpolation, substituting the mechanical/current-based system with an electrical/voltage-based system that consumes less power.
2Speed
If conventional phase interpolator is designed for high-speed circuits, then switching performance is improved, but cost increases
Solution Approach 1:
The patent changes the circuit operating mode from current mode to voltage mode, which simplifies the circuit design and reduces component requirements. The voltage-based phase interpolator uses standard resistors and voltage-controlled switches instead of precision current sources, making the circuit easier to manufacture and less costly while achieving high-speed performance.
3Adaptability or versatility
If conventional phase interpolator is used, then phase adjustment capability is provided, but input signal is limited to sinusoidal signals only
Solution Approach 1:
The patent designs a universal voltage mode phase interpolator that can process multiple types of input signals including sinusoidal, square, and triangular waves. The voltage-based switching mechanism and resistive mixing network are signal-type agnostic, allowing the circuit to accurately interpolate phases for various waveforms without requiring signal-specific design modifications.
Data Source
AI summary
A phase interpolator includes a phase adjusting circuit. The phase adjusting circuit includes a first phase adjusting module and a second phase adjusting module, the first phase adjusting module outputs a first clock signal, and the second phase adjusting module outputs a second clock signal; the first phase adjustment module and the second phase adjustment module are connected in parallel to output an interpolation signal. Through the first phase adjustment module and the second phase adjustment module the first clock signal and the second clock signal with the same frequency and different phases are mixed in proportion by adopting a voltage mode to generate an interpolation so as to achieve the purpose of phase adjustment, and meanwhile, the circuit can be carried out under lower voltage, so that the power consumption of the phase adjusting circuit is further reduced.