Abstract
本研究提出5.7GHz可調式功率放大器(PA)，主要是應用於生理檢測醫療系統方面，由於高頻可用之頻寬較多，傳輸速度快，其指向性高，並且能將信號傳輸至較遠之處，更重要的是，它可以依照系統的不同需求改變功率(power)與增益(Gain)的大小，所以對於生醫檢測儀器信號傳輸裨益良多。另外，在設計上，需考慮元件選擇、偏壓點(Vds、Vgs)、穩定度(Stability)、線性度(輸入三階交點,IIP3、1dB壓縮點, P1dB)、效率(PAE)...等；在生醫方面應用的考量下，應使其線性度(Linearity)要高，盡量減少信號失真；輸入與輸出功率(Pin、Pout)不需太大，避免微波對人體的傷害，以這些重點為主要考量因素，並逐步發展應用於醫療相關環境設施中。本研究所模擬的電路特性，係利用直流偏壓(Vds1/Vgs1/Vds2/Vgs2)為1.8V/1.2V/1.2V/1.0V，Idc-bias 16 mA、Idc2-bias 12mA，得到增益為13.176 dB，輸入/輸出返回損耗(return loss) 分別為-9.01 dB/-6.18 dB，P1dB壓縮點約-6 dBm，及輸入三階交點(IIP3)為27.5 dBm，均能達到良好之特性。
The research investigates on 5.7GHz power amplifier (PA) that applying in medical diagnosis. Because high frequency PA can use more bandwidth, fast response, good index and long transmission path, it is implemented extensively. More importantly, the system can adjust power and gain by different requirements. So, it is more helpful for medical diagnosis application. Besides, we must consider device selection, bias(Vds、Vgs), stability, linearity, PAE effect and so on. For medical daignosis application, high linearity, low distortion, feasible input and output power are required, because they can reduce the effect to human causing by the electronmagnetic radiation. That is major consider to develop in medical diagnosis environment. PA gain of 13.176 dB, return loss of -9.0 dB/-6.18 dB, P1dB of -6dBm and IIP3 of 27.5 dBm with DC bias (Vds1/Vgs1/Vds2/Vgs2) of 1.8V/1.2V/1.2V/1.0V, Idc1-bias=16 mA are the circuit performance of the research simulation. They exhibit good performance.
The research investigates on 5.7GHz power amplifier (PA) that applying in medical diagnosis. Because high frequency PA can use more bandwidth, fast response, good index and long transmission path, it is implemented extensively. More importantly, the system can adjust power and gain by different requirements. So, it is more helpful for medical diagnosis application. Besides, we must consider device selection, bias(Vds、Vgs), stability, linearity, PAE effect and so on. For medical daignosis application, high linearity, low distortion, feasible input and output power are required, because they can reduce the effect to human causing by the electronmagnetic radiation. That is major consider to develop in medical diagnosis environment. PA gain of 13.176 dB, return loss of -9.0 dB/-6.18 dB, P1dB of -6dBm and IIP3 of 27.5 dBm with DC bias (Vds1/Vgs1/Vds2/Vgs2) of 1.8V/1.2V/1.2V/1.0V, Idc1-bias=16 mA are the circuit performance of the research simulation. They exhibit good performance.
| Original language | Chinese (Traditional) |
|---|---|
| Pages (from-to) | 33-40 |
| Journal | 明志學報 |
| Volume | 37 |
| Issue number | 1 |
| State | Published - 2005 |