Adaptive Body Bias Frequency Divider for Wideband Clock Operation
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Solution Overview
Problem
Frequency dividers face challenges in operating effectively across a wide frequency band due to fluctuations in input signal frequencies, leading to potential failure in frequency division operations.
Innovation Solution
A frequency divider with a frequency dividing core circuit, a controller, and an adaptive body bias (ABB) generator that adjusts body biases based on clock frequency information to optimize the self-oscillation frequency and expand the operating region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frequency divider operates with a fixed self-oscillation frequency, then the circuit design is simple, but the operating region is limited and cannot adapt to frequency fluctuations
Solution Approach 1:
The patent applies dynamics by making the self-oscillation frequency adjustable rather than fixed. The frequency divider includes a controllable oscillator whose frequency can be dynamically changed based on the input clock frequency, allowing the device to adapt to different operating conditions while maintaining reliable frequency division operation
Solution Approach 2:
The patent changes the parameter of self-oscillation frequency to resolve the contradiction. By providing multiple selectable frequency values and allowing dynamic adjustment of this parameter based on operating conditions, the frequency divider can adapt to a wide frequency range without requiring complete redesign for each frequency band
2Reliability
If the self-oscillation frequency is fixed, then the circuit is stable, but the frequency divider may go out of operation region when input frequency fluctuates
Solution Approach 1:
The patent implements feedback by detecting the input clock frequency and using this information to adjust the self-oscillation frequency accordingly. The controller monitors the operating conditions and dynamically adjusts the oscillator frequency to maintain the frequency divider within its reliable operating region, ensuring continuous successful operation across varying input frequencies
Solution Approach 2:
The system transitions from a static fixed-frequency design to a dynamic adaptive design where the self-oscillation frequency automatically adjusts in response to input frequency changes, maintaining reliable operation across a broad frequency spectrum
Data Source
AI summary
Disclosed is a frequency divider which includes a frequency dividing core circuit that includes a plurality of transistors and is configured to generate at least one division clock signal based on a clock signal and an inverted clock signal, a controller that is configured to generate a body bias control signal based on clock frequency information, and an adaptive body bias (ABB) generator that is configured to generate at least one body bias based on the body bias control signal and configured to apply the at least one body bias to a body of one or more of the plurality of transistors.