應用於微波訊號偵測的頻率對直流訊號轉換器

Abstract

本篇論文主要在設計一個能感測微波訊號的頻率對直流電壓轉換器，應用在22GHz到29GH來達到高頻寬的目的。學生提出的架構是透過低通濾波器與緩衝器將訊號分別取出，經過功率感測器將訊號轉換成直流後再做開根號相除的數學運算，透過此簡單的數學運算，可得到一個線性的頻率對直流電壓轉換特性。 本論文分成兩部分，第一部分是設計一個-10dBm到0dBm輸入功率動態範圍的頻率對直流電壓轉換器，使用TSMC 0.18-μm CMOS製程。模擬結果顯示在22GHz到29GHz的輸入頻率變化量下，有著694mV的輸出電壓差。線性誤差與輸入功率產生的誤差皆小於6.3%，功率損耗為7.25mW。 第二部分為將所提出的架構在基板層次上做驗證，量測結果顯示在1.5GHz到3.5GHz的感測頻率下，有著325mV的輸出電壓差。且提供了30dBm的輸入功率動態範圍。

This thesis aims at the design of a frequency to voltage converter with 22GHz to 29GHz wide sensing frequency bandwidth for providing microwave frequency sensing. The propose structure is transformed two signals by low pass filter and buffer respectively, and two power detector convert signals into DC voltage and then do the math divided by the square root. Based on a very simple operating principle, the converter provides a linear transfer characteristic. Two topics are realized in this thesis. The first topic is a frequency to voltage converter with -10dBm to 0dBm input power dynamic range in TSMC 0.18-贡m CMOS technology. The simulation results show 694mV maximum output variable voltage with 22GHz to 29GHz input frequency different. Linearity error and input power error are less then 6.3% under 7.25mW power consumption. In the second topic, the proposed frequency to voltage converter is verified in board level. Measurement results show 325mV maximum output variable voltage with 1.5GHz to 3.5GHz input frequency different. Provided 30dBm input power dynamic range.