Multiphase Frequency Multiplier With Non-Overlapping Pulse Synthesis
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Solution Overview
Problem
Existing frequency multipliers experience reduced output signal swing and increased current consumption due to pulse overlap, which affects their efficiency and performance.
Innovation Solution
A frequency multiplier design that includes a multiphase signal generator, pulse generator, and synthesizer, utilizing a delay line, buffer, phase detector, charge pump, and switches to generate and process multiphase signals, falling and rising pulses, and edges to produce a frequency multiplication signal with reduced overlap and optimized current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiphase pulses are combined to generate frequency multiplication signal, then frequency multiplication is achieved, but pulse overlap occurs causing reduced output signal swing and increased current consumption
Solution Approach 1:
The pulse generation process is segmented into separate falling pulse generation and rising pulse generation paths. Each path processes specific phases of the multiphase signals independently, allowing precise control over pulse timing and width to eliminate overlap while maintaining frequency multiplication.
Solution Approach 2:
The pulse widths are predetermined and controlled based on the phase differences between multiphase signals before the actual frequency multiplication occurs. This preliminary setting of pulse parameters prevents overlap from occurring in the first place, rather than attempting to correct it afterward.
2Speed
If multiphase pulses are combined to generate frequency multiplication signal, then frequency multiplication is achieved, but pulse overlap occurs causing reduced output signal swing
Solution Approach 1:
The synthesizer is divided into separate first switch circuit and second switch circuit, each handling different pulse transitions (falling and rising respectively). This segmentation allows independent optimization of each pulse type to maintain full voltage swing without overlap-induced degradation.
Solution Approach 2:
Different pulse characteristics are applied locally to different signal phases. Even-phase signals generate falling pulses with specific width, while odd-phase signals generate rising pulses with matched width, creating locally optimized pulse qualities that collectively achieve high-quality frequency multiplication without swing reduction.
Data Source
AI summary
A frequency multiplier includes: a multiphase signal generator configured to generate multiphase signals in response to a source signal; a pulse generator configured to generate a plurality of pulse signals in response to the multiphase signals; and a synthesizer configured to generate a frequency multiplication signal in response to edges of the pulse signals. Each of the plurality of pulse signals is generated in response to a corresponding multiphase signal, and the frequency multiplication signal is obtained by multiplying a frequency of the source signal.