TW418513B - Method and device for interconnect radio frequency power SiC field effect transistors - Google Patents

Method and device for interconnect radio frequency power SiC field effect transistors Download PDF

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Publication number
TW418513B
TW418513B TW87117780A TW87117780A TW418513B TW 418513 B TW418513 B TW 418513B TW 87117780 A TW87117780 A TW 87117780A TW 87117780 A TW87117780 A TW 87117780A TW 418513 B TW418513 B TW 418513B
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Taiwan
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source
bonded
electrode
gate
wires
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TW87117780A
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English (en)
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Andrej Litwin
Ted Johansson
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Ericsson Telefon Ab L M
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A 185 ^
五、發明說明（1) 發明領域 本發明有關用以互連射頻功率碳化矽場效電晶體之方 法’包含用於頻率功率碳化矽場效電晶體互連設計之裝置 與具互連設計之射頻功率碳化矽場效電晶體。 發明背景 碳化矽（Si C)電晶體已開始替代於Si與以“電晶體二者 用於GHz頻率功率產生。根據優良的材料特性，其經預測 且比較其他敘述之電晶體型式已同樣地實驗性顯示操縱更 加較高功率密度’即相同尺寸電晶體可產生數倍較高功 率。為了在一真實的電晶體封裝中完全地使用碳化矽晶粒 之優點，晶粒至封裝之連結同樣應修改。關於一傳統 MESFET設計，特性内部指狀閘極與源極黏合墊1 ’ 2與電線 3，4，如圖1顯示’黏合電線3，4之寄生電感對碳化石夕電 晶體將比其他材料型式更高，因為較小的晶粒將容許較少 的黏合導線°特別是寄生源極電感對電晶體特性係有害 的。 發明摘要 為了改進寄生源極電感之新方法係採取小尺寸電晶體< 優點，且配置黏合墊在晶粒之二側上’在像這樣的方法 中，大多數源極黏合電線將垂直地橫越問極與汲極黏合電 線。多重黏合電線可連結至源極黏合墊’減低源極電感。 由於正交電配置’一額外的優點來自於藉減低在源/開杨 之間與在源/汲極之間相互電感之此配置° 在一實例中’當多重電晶體晶粒必須配置在相同封带中
4185 13 五、發明說明（2) =地咸：二f ΐ片配置在晶粒之間以簡化黏合程序，且更 進地減低源極電感。 本發明將參考較佳眘 圖式簡單說明 貫例與隨附之圖式更進一步地描述。 f 1係MSFET電線與黏合塾之傳統配一晶 一设計 〇 圖2係根據本發明用μ 4^ 4-fr ^ ^ ;連釔至墊之源極黏合電線在一晶 合電線。XD此處源極黏合電線係垂直於閘極與汲極黏 圖3係根據本發明之—設計 在晶粒之間。 此處一跨接器晶片係配置 圖4係根據本發明用於碳化矽MESFET之一推薦的電晶體 計實例。 圖5係根據本發明用於碳化矽MESFET之推薦的電晶體設 較佳實例詳細說明 =頻率功率放大之作用裝置係廣泛地用在通訊系統之輸 出ί件中。在高功率位準，大致超過1 KW，使用放大之真 空官或其他型式。移動波管（TWTs)_Klystr〇ns_係用於超 過1 0 MW之功率位準。在較低功率位準，固態電晶體係用 於幾乎所有的RF功率放大。高頻率電晶體係在早期5〇年代 中首先以鍺製造’但在6 〇年代開端中不久為矽雙極電晶體 取代，且自從以後則支配RF功率，參閱：1971年8月， IEEE版’第59早，第1163頁，Cooke所著"微波電晶
C;\Program F iles\Patent\55546.ptd
A 1 8 5 i 3 五、發明說明（3) 體：理論與設計11。 對細胞狀無線電而言，矽雙極電晶體係完全地支配在基 地台輸出放大器中，且可傳送超過至少2 GHz具良好穩定 性、可用性與價格之高效率。此放大等級之其他技術選擇 係GaAs MESFETs與最近開發侧邊式擴散MOS電晶體 (LD-MOS)。因為快速地擴張電訊市場，具有一強驅動力以 更進地改進現存技術，和探究新型裝置一樣。 功率電晶體係特別地設計以傳送高輸出功率與高增益。 製造程序、裝置參數、佈局與封裝已謹慎地適合於此目 的。裝置需要符合崩潰電壓、DC增益或跨導、電容、RF增 益、崎嶇起伏、雜訊圖、輸入/輸出阻抗、失真等等之數 位細節需求。操作頻率範圍從數百MHz以上進入微波區 域。大約1 W輸出功率係一起始位準，此處特定考量必須 考慮，且可視為一功率裝置之鬆散定義，比較一"標準"I C 型電晶體。通常只有一 η頻道裝置係用在一單晶粒上。輸 出功率需求範圍數百瓦特以上，有時甚至千瓦特，且高輸 出功率係藉並聯許多電晶體格室在一單晶粒上且並聯數個 晶粒在一封裝中完成。封裝常常具有大的鍍金散熱以移除 晶片產生之熱能。 碳化矽電晶體最近已廣泛地研究為替代於Si與GaAs電晶 體二者用於G Η z頻率功率產生。碳化石夕之獨特性質係高崩 潰電場（4 · 10e V/cm)，高飽和電子漂移速度（2 · 107 cm/s)與高熱傳導率（4. 9 W/cmK)。因此，碳化矽基裝置已 預知，且比較上述電晶體型式已實驗性顯示操縱更加較高
4185 13 五、發明說明（4) 功率密度’因為優良的材料特性°碳化矽裴置需要操作在 非常高的供應電壓（4δ V以上）以完全地顯示它們的優點。 技術依然係在研發實驗中，且數種材料與處理問題必須在 商業性應用之前解決。雖然裝置係較貴的，全部系統費用 預知為較低的。 大多數RF功率電晶體係内部式匹配，因為低阻抗位準用 於封裝内部之大晶粒。内部氐配網路由小直徑（25_5〇微 米）黏合電線，同樣必須互連，與晶片電容器組成，朱 閱：1997年9/10月，應用之微波&無線，第&頁，/ T. Johansson所著u在叮功率電晶體内部" J導等等係非-般使用。在大多數實例中， 長短，且因此可精確地表示為具有限串聯電阻之電感。晶 片電容器係使用相似於丨c製造技術以矽製造。 ^ 多重益聯黏合電線係用在RF功率電晶體中。恭 電感擔任裝置效率之重要角色，因為在二f / 旦文月巴 u荷在封裝中電線間之交 、 寸別重要係FETs之閘—汲極交互作用，和全部電 感減=至最小一樣，特別是用於接地連結（源極）。 對碳化矽裝置而言，匹配與封裝係相似於 了在一真實的電晶體封Η完全地使用碳切^之;:憂為 點’晶粒至封裝之連結同樣應修改= 墊ί ί二寄生電⑤，且採取小尺寸電晶體之優點，黏合 墊係配置在晶粒之二側上，在像這樣的方法中， 閑極與汲極黏合電線° "黏合電線可連、：至源 極J s整’減低源極電感，由於正交電配置，其中一額外
1 3 五、發明說明（5) 的優點來自於藉減低在源/開極之間與在源/汲極之間相立 電感之此一配置。 在圖2中 其係根據本發明顯示一較佳電線設計在晶 粒5上’此處源極黏合電線6係配置在晶粒之二側上，垂 直於閘極與没極黏合電線7，8。源極黏合墊係配置在晶粗 5之邊緣上’且源極黏合電線6係垂直於閘極與汲極黏合電 線7 ’ 8。虛線根據圖4顯示一電晶體之真實的配置在/晶 粒上。 在多重電晶體晶粒必須配置在相同封裝中之實例中，如 圖3顯&不’ 一跨接器晶片1 〇可配置在晶粒11 ，12之間以簡 化4 5程序’且更進—步地減低源極電感。此配置方法甚 至可使用在具—單晶粒之實例中。 在圖4中，那係顯示用於碳化矽MESFET之一推薦的電晶 體設計實例，此處源極金屬延伸至黏合晶粒之二侧。2個 :屬層係：於電晶體’ f 一層用於連結汲極指狀件13之金 社門極沪：：A用於換越在連結源極指狀件1 4之金屬與連 = : = 為了連結源極與間極指狀件在 具對應黏合墊之電晶體同側上。 桕，Η々4* sA τ / 人化石夕晶粒較佳地係矩 形，且在大致上平行於源極黏合 右一#丨从古Α $ ^ ^ 口逼線或電線束之方向中具 有取小的直徑。再者，所有源椏指狀株在益一认π从怎 極金屬桿或源極滑架I 6連結在一件係錯一 /、同的源 1¾八執1你！ ·喜；r冷 1 之以平行於延著配置閘極 黏〇墊1側邊仃進。源極黏合電線6 Λ φ a Μ ^ . . 貼附至源極金屬桿1 6 在玉扭體之紐側邊上垂直於閘極黏 磕S。A戽徊I ®4 A , σ電線7與汲極黏合電 線S 在母個電線群組中所有黏合雷始 电線杈佳地係平行的。
C:\Program Files\Patent\55546. ptd 第9頁 4t85 1 3 五 '發明說明（6) I:ΐ ΐ:短侧邊可用為一黏合區域’其提供具有-最佳 曰自由度與源極黏合電線配置之額外優點。推薦的電 晶粒上，如圖2中剖面線顯示，其中在每 ;黏合墊較佳地係分隔在大致相等的間距。 指狀：丄係:碳化'夕電晶體設計之零件，此處不同的連結 層用於'1灶5忍’其中2個金屬層係用於電晶體。第一金屬 越在連ί = ϊ指狀件13之金屬化，且第二金屬層用於橫 間，為了诖壯、s: Γ 連閘極指狀件15之金屬 同側上。源極金屬橫斷面i 7越㉟；f應黏合墊之電晶體 16。 ❻斷面Η越過-閘極滑架18至源極滑架 而前述包括數位細節與說明，苴 明之說明性，幻系非構成為限制：：：：些只不過係本發 技者將易於明瞭，其未脫離發明 〔七改對那些習於此 之申請專利範圍與它們的合法同枝=與範圍，如藉隨附 哥件疋義。
C:\ProgramFiles\Patent\55546.ptd 第 10 g

Claims (1)

  1. 85 1 3 案號 87117780 :::冰管7赛4〇 曰 89. 7. η , ；y ，年月 a 、 修正 申請專利範圍 1 . 一種用以互連射頻功率碳化矽場效電晶體之方法，該 電晶體包含一具有黏合電線在墊上之晶粒，該方法之特徵 在於配置至少一黏合墊在晶粒之不同側邊上，以大多數源 極黏合電線係實質地以垂直於閘極與汲極黏合電線之方式 配置。 2. —種用以互連射頻功率碳化矽場效電晶體之裝置，該 電晶體包含具有黏合電線在墊上之一晶粒，其特徵在於至 少一黏合墊係提供以配置在晶粒之不同侧邊上，其中大多 數源極黏合電線（6 )係實質上以垂直於閘極與汲極黏合電 線（7，8 )配置。 3. 如申請專利範圍第2項之裝置，其特徵在所有源極黏 合電線係垂直地配置至所有閘極與汲極黏合電線。 4. 一種射頻功率碳化矽場效電晶體，包含： 一碳化矽晶粒； 形成於内部指狀電極之碳化矽晶粒（5 )，每個電極具 有至少一電極指狀件，實包括至少一黏合墊； 連結至一源極之黏合墊的至少二源極黏合電線（6 )， 該等黏合墊位於晶粒之相對側上，且主要地平行於電極之 電極指狀件方向延伸； 連結至一閘極之黏合墊的至少一閘極黏合電線（7)， 且主要地平行於電極之電極指狀件方向延伸； 連結至一汲極之黏合墊的至少一汲極黏合電線（8 )， 且主要地平行於電極之電極指狀件方向延伸，其中該等二 個源極黏合電線或大多數源極黏合電線（6 )係實質上垂直 配置至閘極與汲極黏合電線。
    O:\55\55546.ptc 第1頁 2000. 07.18. 011 '4 185 13 _案號87117780 年7月日 修正_ 六、申請專利範圍 5 .如申請專利範圍第4項之場效電晶體，其中所有源極 黏合電線（6 )實質上係垂直地配置至閘極與汲極黏合電線 (7 ， 8) ° 6 .如申請專利範圍第4項之場效電晶體，其中碳化矽晶 粒（5)實質上係呈矩形，且具有在實質上平行於大多數源 極黏合電線（6 )之方向中最小的直徑。 7.如申請專利範圍第4項之場效電晶體，其中每個内部 指狀電極包括多數黏合墊，裝置更包含連結至每個電極的 每個該多數黏合墊之額外的黏合電線。 8 .如申請專利範圍第4項之場效電晶體，其中在每個電 線群組中所有黏合電線係呈平行。 9.如申請專利範圍第4項之場效電晶體，其中在每個黏 合墊群組中多數黏合墊係分隔在實質相等的間距。
    O:\55\55546.ptc 第2頁 2000.07.18.012
TW87117780A 1998-10-13 1998-10-27 Method and device for interconnect radio frequency power SiC field effect transistors TW418513B (en)

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