Super-Regenerative Oscillator Startup Detection With Boost Current
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Solution Overview
Problem
Existing super-regenerative receivers face challenges in accurately detecting the start-up time of their oscillators due to low oscillation amplitudes and sensitivity issues with CMOS technology, leading to inefficiencies and high power consumption.
Innovation Solution
A method involving an additional amplification current is supplied to the oscillator upon detection of initial oscillation, allowing for precise determination of the start-up time, followed by immediate shutdown to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the oscillation amplitude is kept low during startup, then power consumption is reduced, but detection precision deteriorates because typical CMOS amplitude detection circuits cannot detect amplitudes below 100 mV
Solution Approach 1:
The patent introduces an intermediary amplification stage between the oscillator and the detection circuit. This intermediary amplifier boosts the weak oscillation signal (below 100 mV) to a level that can be reliably detected by standard CMOS detection circuits, thereby enabling precise detection without requiring high oscillation amplitudes and maintaining low power consumption.
2Reliability
If the bias current is increased to improve oscillation startup reliability, then the oscillator starts more reliably, but power consumption increases and the start-up time becomes less well-defined
Solution Approach 1:
The patent employs dynamic bias current control where the bias current is gradually increased from a low initial value until the oscillation startup condition is met, then maintained at that level. This dynamic adjustment ensures reliable startup while minimizing power consumption by avoiding excessive bias current from the beginning.
Solution Approach 2:
The detection circuit provides feedback information about the oscillation startup status to the bias current control mechanism. When oscillation is detected, the system adjusts the bias current accordingly, ensuring reliable startup while optimizing power consumption by maintaining only the necessary current level.
3Measurement precision
If the oscillation detection threshold is set low to improve detection precision, then early oscillation can be detected, but false detection increases due to noise
Solution Approach 1:
The intermediary amplifier not only amplifies the signal but also provides signal conditioning that enhances the signal-to-noise ratio. This allows the detection circuit to use a low threshold for early oscillation detection while the amplified and conditioned signal remains distinguishable from noise, reducing false detections.
Solution Approach 2:
The patent replaces direct voltage threshold detection with an amplified and conditioned signal detection approach. By using the intermediary amplification stage, the system substitutes simple threshold comparison with a more sophisticated detection mechanism that can distinguish true oscillation signals from noise even at low amplitudes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate detection of the oscillator's start-up time and significantly reduces power consumption by ensuring rapid switching off of the bias and amplification currents once oscillation is confirmed.
Implementation Method 1
an oscillator such as a VCO (Variable Voltage Regulator) of the LC type can be used. This type of LC oscillator begins to oscillate when the losses in the L and C resonator are compensated by the negative conductance of active devices.
Implementation Method 2
A method involving a bias current generator and an additional amplification current circuit is used to supply an additional amplification current to the oscillator upon detection of oscillation
Implementation Method 3
the oscillation detector 6, which is connected between a coil output of the reference oscillator 4 and the bias current generator 7 so as to control the generator 7, particularly after an RF signal is received by the receiver 1 and an oscillation of the oscillator is detected
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A method is provided for improving the detection of the start-up time of a reference oscillator (4) of a super-regenerative receiver (1). The receiver (1) comprises the reference oscillator (4), a bias current generator (7) to supply a bias current (i_vco) to the reference oscillator (4) upon receipt of at least one activation control signal (Sosc), an oscillation detector (6) connected between an output (coilp) of the reference oscillator (4) and the bias current generator (7) to detect an oscillation in the reference oscillator (4), and an impedance matching unit (3) disposed between a terminal or pad (2) for receiving an RF signal from the receiver (1) and the reference oscillator (4).Following the supply of the bias current (i_vco) after receiving the activation control signal (Sosc), an oscillation detection is performed by the oscillation detector (6), and as soon as the oscillation is detected, an additional amplification current (iboost) dependent on the envelope of the detected oscillation, from an amplification current generation circuit is supplied to the reference oscillator (4) in addition to the bias current to amplify the oscillation signal to be above a critical oscillation start threshold so as to precisely define the start time of the oscillator, and allow the oscillation detector (6) to command the oscillation stop of the reference oscillator (4).