Analog Baseband Circuit for Terahertz Phased Array Systems
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Solution Overview
Problem
Conventional phased array systems are limited to conventional RF frequency ranges due to the unavailability of compact semiconductor sources of coherent terahertz radiation, which is desirable for its unique properties, but existing terahertz sources are either incoherent, inefficient, or require exotic materials and high power consumption.
Innovation Solution
A phased array system integrated into an integrated circuit that generates and digitizes terahertz radiation using a local oscillator, transceivers, and analog baseband circuitry, including switched capacitor banks and a delay-locked loop, to form a compact source capable of operating within the terahertz frequency range and efficiently processing high bandwidth signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional RF frequency ranges are used, then available semiconductor sources and electronics are sufficient, but terahertz radiation properties and bandwidth cannot be achieved
Solution Approach 1:
The patent replaces mechanical/external terahertz sources with an electronically-generated terahertz signal produced by a voltage-controlled oscillator (VCO) integrated on the chip. This substitution enables terahertz frequency operation using standard semiconductor processes while maintaining the desired frequency range adaptability.
Solution Approach 2:
The phased array system is designed to operate across a universal frequency range from microwave through millimeter-wave to terahertz frequencies (0.1 THz to 10 THz). The same integrated circuit architecture handles multiple frequency bands, eliminating the need for separate hardware designs for different frequency ranges.
2Measurement precision
If high sampling rates are used to process terahertz signals, then signal bandwidth is captured, but power consumption and circuit complexity increase
Solution Approach 1:
The system uses periodic pulsed terahertz radiation instead of continuous wave operation. The VCO generates terahertz signals in periodic pulses synchronized with the sampling clock, allowing the analog-to-digital converter to operate at lower average power while still capturing the full bandwidth information during each pulse period.
Solution Approach 2:
The system performs preliminary downconversion of the terahertz signal to an intermediate frequency before final digital conversion. This preliminary action reduces the bandwidth requirements for the final ADC, allowing lower sampling rates and reduced power consumption while preserving the essential signal information.
3Adaptability or versatility
If coherent terahertz sources are used, then radiation control and optics compatibility are achieved, but power consumption and device size increase
Solution Approach 1:
The patent extracts only the essential function of coherent terahertz generation from complex external sources and implements it using a simple voltage-controlled oscillator integrated on the chip. This extraction eliminates the need for bulky external terahertz sources while maintaining coherent radiation control capabilities.
Solution Approach 2:
The integrated circuit generates its own terahertz signal internally using the VCO, eliminating the need for external terahertz sources. The system is self-sufficient, producing the required coherent terahertz radiation control signals directly from the semiconductor chip without requiring external power-hungry terahertz generation equipment.
Data Source
AI summary
A method for determining the position of a target is provided. Several emitted pulses of terahertz radiations are emitted from a phased array (which has several transceivers) in consecutive cycles (typically). These emitted pulses are generally configured to be reflected by a target so as to be received by the phased array within a scan range (which includes a digitization window with several sampling periods). Output signals from each of the transceivers are then combined to generate a combined signal for each cycle. The combined signal in each sampling period within the digitization window for emitted pulses is averaged to generate an averaged signal for each sampling period within the digitization window. These averaged signals are then digitized.