Super-Regenerative Oscillator Startup Boost for Precise Start Detection
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Solution Overview
Problem
Existing super-regenerative receivers face challenges in accurately detecting the start time of the oscillator due to low oscillation amplitudes and limited sensitivity of CMOS technology amplitude detection circuits, leading to inefficiencies in electricity consumption and detection precision.
Innovation Solution
A method that involves providing an additional amplification current, known as the 'boost' current, to the oscillator once a low voltage threshold is reached, allowing for precise detection of the start time and subsequent reduction in electricity consumption by cutting off both bias and amplification currents after oscillation is detected, utilizing a circuit that generates this additional current to enhance the detection of the start time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the oscillator is supplied with only the conventional bias current, then the electricity consumption is reduced, but the detection precision of the start time is insufficient due to low oscillation amplitudes
Solution Approach 1:
The patent applies preliminary action by providing an additional amplification current to the oscillator before the oscillation reaches a detectable amplitude level. This boost current is supplied during the startup phase to ensure the oscillation amplitude quickly exceeds the detection threshold, enabling precise start time detection. Once detection is achieved, the amplification current is cut off, thus achieving accurate detection without continuous high energy consumption.
2Measurement precision
If the oscillation amplitude is kept low to reduce power consumption, then electricity consumption is reduced, but the detection precision deteriorates due to insufficient signal amplitude
Solution Approach 1:
The patent implements periodic action by supplying the amplification current in a time-limited manner during the oscillator startup phase. The current is activated when the oscillator starts and automatically cut off once the oscillation amplitude exceeds the detection threshold. This periodic supply pattern ensures precise detection during the critical startup period while minimizing energy consumption during steady-state operation.
3Reliability
If the bias current is continuously supplied to maintain oscillator operation, then the oscillation detection reliability is improved, but the electricity consumption increases
Solution Approach 1:
The patent extracts the amplification function from the continuous bias current by introducing a separate, time-limited amplification current. This additional current is supplied only during the startup phase to ensure reliable oscillation detection, while the conventional bias current is cut off once detection is achieved. This separation allows reliable detection during the critical period without the penalty of continuous high energy consumption.
Data Source
AI summary
A method is provided for enhancing the detection of the start time of a reference oscillator (4) of a super-regenerative receiver (1), which includes the reference oscillator, a bias current generator (7), an oscillation detector (6), and an impedance matching unit (3). 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 once oscillation is detected, an additional amplification current (iboost) dependent on the envelope of the detected oscillation, of 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 enable the oscillation detector (6) to order the stoppage of oscillation of the reference oscillator (4).