VCO Bias Boosting for Fast Oscillator Steady-State Startup
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Solution Overview
Problem
Existing communication systems are power inefficient due to continuous power consumption even during idle times, leading to short battery life in portable devices and potential data loss, delays, and downtime.
Innovation Solution
A voltage-controlled oscillator (VCO) apparatus with a boost bias circuit and quiescent bias circuit is used to rapidly generate an oscillating signal, reaching a steady-state condition within a short time frame, particularly in low duty cycle pulse modulation applications, and is adapted to be used as a local oscillator in communication systems to conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter or receiver remains continuously powered, then communication availability is improved, but power consumption increases
Solution Approach 1:
The system employs pulse modulation where the transmitter and receiver are activated only during specific pulse intervals rather than continuously. The pulse modulator generates periodic enable signals that turn the transmitter/receiver on during pulse periods and off during idle periods, achieving both power savings and maintained communication availability during active pulses
Solution Approach 2:
The system dynamically adjusts the operational state of the transmitter and receiver based on communication requirements. A control mechanism continuously monitors and adjusts the power state, transitioning between active and idle modes to optimize the balance between communication availability and power consumption
2Use of energy by moving object
If the transmitter or receiver is powered only during signal transmission/reception, then power consumption is reduced, but the oscillating signal must reach steady-state quickly
Solution Approach 1:
The system prepares the oscillator by pre-charging capacitors and establishing initial conditions during the enable transition. The pulse modulator activates the oscillator just before the pulse begins, allowing the oscillating signal to start from a prepared state rather than from cold start, thereby reducing the time to reach steady-state
Solution Approach 2:
The system changes operational parameters during the enable transition to accelerate steady-state achievement. By adjusting bias currents, capacitor charging voltages, and oscillator frequency during the enable period, the system optimizes the transient response to reach steady-state faster within the pulse duration
3Use of energy by moving object
If the pulse width is short (low duty cycle), then power efficiency is improved, but the oscillating signal has less time to stabilize
Solution Approach 1:
The system performs preliminary preparation of the oscillator state before the pulse begins. Capacitors are pre-charged to specific voltages and bias conditions are established during the enable transition, so that when the pulse starts, the oscillator is already close to its steady-state operating point, achieving stability within the short pulse width
Solution Approach 2:
The system accelerates the transient response by applying higher initial currents or voltages during the enable period to rush the oscillator through the transient phase quickly. This allows the oscillating signal to reach stability faster, completing stabilization within the short pulse duration before returning to idle state
Data Source
AI summary
An apparatus for generating an oscillating signal that includes a circuit to accelerate the time in which an oscillating signal reaches a defined steady-state condition from a cold start. The apparatus includes an oscillating circuit to generate an oscillating signal; a first circuit to supply a first current to the oscillating circuit; and a second circuit to supply a second current to the oscillating circuit, wherein the first and second currents are adapted to reduce the time duration for the oscillating signal to reach a defined steady-state condition. The apparatus may be useful in communication systems that use low duty cycle pulse modulation to establish one or more communications channels, whereby the apparatus begins generating an oscillating signal at approximately the beginning of the pulse and terminates the oscillating signal at approximately the end of the pulse.