UWB Pulse Generator Startup Circuit for Faster Oscillation
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Solution Overview
Problem
Existing pulse generators for UWB communication and UWB radar experience significant time delays from switching the transistor from ON to OFF until oscillation starts, which is problematic in high-frequency ranges like 60 to 90 GHz, affecting communication transfer rates.
Innovation Solution
A pulse generator incorporating a semiconductor integrated circuit with a burst control signal generation circuit, a burst oscillation circuit, and an oscillation start trigger generation circuit, where the oscillation start trigger signal forcefully initiates oscillation instead of relying on thermal disturbances, reducing the time to reach steady-state oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transistor switch is used to control the ON/OFF of a burst oscillation circuit, then the oscillation can be stopped when the switch is turned ON, but there is a significant time delay from switching the transistor from ON to OFF until oscillation actually starts
Solution Approach 1:
The patent applies preliminary action by preparing the oscillation circuit in advance through a startup circuit that pre-charges startup capacitors and sets initial conditions for the oscillation transistors. When the burst control signal transitions from L to H, the pre-prepared circuit can immediately start oscillating without waiting for thermal disturbances or random noise to initiate the oscillation process, thereby eliminating the time delay while maintaining reliable oscillation control
2Productivity
If the pulse time width is made smaller to improve UWB communication transfer rates, then the bandwidth can be made wider, but the time delay until oscillation starts becomes more significant relative to the pulse width
Solution Approach 1:
The startup circuit performs preliminary actions by pre-charging capacitors and setting initial voltage conditions before the burst oscillation is needed. This allows the oscillation to start immediately when triggered, enabling the system to use very short pulse widths for high-speed UWB communication without losing a significant portion of the pulse width to startup delay
Solution Approach 2:
The patent changes the parameter of oscillation startup mechanism from passive thermal disturbance-based startup to active circuit-controlled startup. By modifying the circuit parameters through the startup circuit (pre-charging capacitors, setting initial conditions), the system achieves deterministic and immediate oscillation startup, enabling the use of shorter pulse widths for higher transfer rates
Data Source
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AI summary
A pulse generator includes an oscillation circuit (3) that generates a burst signal oscillated for ultrawideband band and an oscillator start trigger generation circuit (4) that generates a trigger signal that causes oscillation by the oscillation circuit to be started.