Oscillator Buffer Power Control Using Amplitude Feedback
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Solution Overview
Problem
Existing circuit devices fail to reliably control the power supply voltage of oscillation and buffer stages in oscillators, leading to fluctuations in oscillation amplitude due to resonator type, manufacturing variations, and environmental changes, resulting in increased power consumption and phase noise.
Innovation Solution
A circuit device with an amplitude detection circuit to detect oscillation signal amplitude and a power supply control circuit to regulate the power supply voltage to be smaller than the amplitude, ensuring stable operation of the waveform shaping circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the power supply voltage of the buffer stage is increased to improve waveform shaping performance, then the output signal quality improves, but the power consumption increases and through current occurs when the power supply voltage exceeds the oscillation amplitude
Solution Approach 1:
The power supply voltage to the waveform shaping circuit is made dynamically adjustable rather than fixed. The control circuit monitors the oscillation amplitude and automatically adjusts the power supply voltage to match the actual oscillation conditions, preventing both excessive voltage (which causes through current) and insufficient voltage (which degrades waveform quality).
Solution Approach 2:
A feedback control mechanism is implemented where the control circuit continuously monitors the oscillation amplitude and uses this information to regulate the power supply voltage to the waveform shaping circuit. This closed-loop control ensures the power supply voltage optimally matches the oscillation amplitude, eliminating through current while maintaining waveform shaping quality.
2Reliability
If the power supply voltage is set higher to ensure sufficient headroom for waveform shaping across all operating conditions, then reliability improves, but power consumption increases and phase noise worsens
Solution Approach 1:
The system transitions from a static high power supply voltage setting to a dynamic adjustment mechanism that adapts to actual oscillation amplitude. This ensures the power supply voltage is always appropriate for current operating conditions, maintaining reliability without the excessive voltage that generates phase noise.
Solution Approach 2:
The power supply voltage parameter is changed from a fixed high value to a variable value that tracks the oscillation amplitude. This parameter adaptation allows the system to maintain sufficient headroom for reliable operation while avoiding the excessive voltage conditions that generate phase noise.
3Device complexity
If fixed power supply voltages are used for oscillation and buffer stages, then device complexity is reduced, but the system cannot adapt to oscillation amplitude variations caused by resonator type, manufacturing variations, or environmental changes
Solution Approach 1:
The control circuit performs multiple functions: it monitors oscillation amplitude, determines appropriate power supply voltage levels, and regulates the waveform shaping circuit power supply. This multi-functional approach enables adaptation to various resonator types and operating conditions without requiring separate control mechanisms for each scenario.
Solution Approach 2:
The system uses its own oscillation signal to control its power supply. The control circuit extracts amplitude information from the oscillation signal itself and uses this information to automatically adjust the power supply voltage, making the system self-regulating and adaptable without external intervention.
Data Source
AI summary
A circuit device includes an oscillation circuit configured to generate an oscillation signal, a waveform shaping circuit configured to perform waveform shaping on the oscillation signal, and a regulator configured to supply a regulated power supply voltage to the waveform shaping circuit. The circuit device further includes an amplitude detection circuit configured to detect the amplitude of the oscillation signal and output an amplitude detection signal, and a power supply control circuit configured to perform control on the regulator based on the amplitude detection signal, such that the regulated power supply voltage becomes smaller than the amplitude of the oscillation signal.