JP2011077841A - 電子装置 - Google Patents
電子装置 Download PDFInfo
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- JP2011077841A JP2011077841A JP2009227499A JP2009227499A JP2011077841A JP 2011077841 A JP2011077841 A JP 2011077841A JP 2009227499 A JP2009227499 A JP 2009227499A JP 2009227499 A JP2009227499 A JP 2009227499A JP 2011077841 A JP2011077841 A JP 2011077841A
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Abstract
【解決手段】実装基板の寄生インダクタンスのうち、半導体装置の共振回路部のGNDと別の共振回路部のGNDとの間の寄生インダクタンス成分を大きく設けることによって、高調波成分のリジェクション量の低下を抑制し、寄生インダクタンスを含まない理想的な場合と同等のリジェクション量を得ることができる。
【選択図】図4
Description
パス17a〜17cの長さ>>パス18a、18bの長さ
となっており、パス17a〜17cおよびパス18a、18bの寄生インダクタンス成分はそれぞれの長さにほぼ比例するため、
パス17a〜17cの寄生インダクタンス成分>>パス18a、18bの寄生インダクタンス成分
が成り立っている。なお、パス17a〜17cの寄生インダクタンスはフィルタ回路におけるインダクタンス5a〜5eと比較して十分に小さいため、パス17a〜17cの寄生インダクタンス成分をそれぞれ同程度の値L_GNDとみなせる。同様に、パス18a、18bの寄生インダクタンス成分をそれぞれ同程度の値L_GND_ISOとみなせる。
3本のパス17a〜17cにおける寄生インダクタンス成分(L_GND)>>2本のパス18a、18bにおける寄生インダクタンス成分(L_GND_ISO)
となる。
図4(a)〜図4(c)は、本発明の実施形態による電子装置の構成について説明するための図である。図4(a)は、本実施形態における、半導体チップ上にフィルタ回路を有する半導体装置の、PKG(PacKaGe:パッケージ)を含む内部構造の、フィルタ回路部近傍について説明するための上面図である。図4(b)は、本実施形態における、半導体チップ上にフィルタ回路を有する半導体装置のPKGを実装する実装基板のパターンについて説明するための上面図である。図4(c)は、図4(a)の半導体装置を、図4(b)の実装基板に破線に沿って実装した電子装置の、A方向から見た透過断面図である。
パス18の長さ>パス17の長さ
となっており、パス17a〜17cおよびパス18a、18bの寄生インダクタンス成分はそれぞれの長さにほぼ比例するため、
パス17a〜17cの寄生インダクタンス成分<パス18a、18bの寄生インダクタンス成分
の関係が成り立っている。なお、パス17a〜17cの寄生インダクタンスはフィルタ回路におけるインダクタンス5a〜5eと比較して十分に小さいため、パス17a〜17cの寄生インダクタンス成分をそれぞれ同程度の値L_GNDとみなせる。同様に、パス18a、18bの寄生インダクタンス成分をそれぞれ同程度の値L_GND_ISOとみなせる。
L_GND_ISO/L_GND<0.5
の場合では、共振回路が2個の場合のリジェクション量が−32.8dBとなり、共振回路が1個のときのリジェクション量である−36.7dBよりもリジェクション量が少ないことがわかる。また、
L_GND_ISO/L_GND=0.5
の場合に、共振回路が1個の場合と2個の場合のリジェクション量がそれぞれ−36.7dBと等しくなり、
L_GND_ISO/L_GND>0.5
の場合に、共振回路を2個に増加することでリジェクション量を大きくする効果が得られることがわかる。
L_GND_ISO/L_GND≧1
に相当する寄生インダクタンス比が得られるため、リジェクション量は−40.5dBとなり、従来例と比べてリジェクション量が7.7dB増加している。
図7は、本発明の第2の実施形態による電子装置の透過断面図である。本実施形態による電子装置も、第1の実施形態と同様に、半導体装置と、この半導体装置を実装する実装基板とを具備する。なお、本実施形態による半導体装置の、PKGを含む内部構造の、フィルタ回路部近傍に係る上面図は、図4(a)と同じであるので省略する。また、本実施形態による、半導体チップ上にフィルタ回路を有する半導体装置のPKGを実装する基板のパターンに係る上面図は、図4(b)と同じであるので省略する。言い換えれば、図7は、本実施形態において、図4(a)の半導体装置を、図4(b)の実装基板に破線に沿って実装した際の、A方向から見た透過断面図である。
L_GND_ISO/L_GND>>1
すなわち
L_GND_ISO>>L_GND
とすることが可能となる。その結果、本来GNDに落とすことでリジェクションを図る筈の周波数成分が、共振回路aと、対応するパス18と、共振回路bとを経由して戻り、フィルタ回路出力部8に再び現れる現象を、大幅に抑制することが出来る。なお、本実施形態における、このリジェクション対象の周波数成分とは、周波数が2f0の2倍波である。
5a〜5c スパイラルインダクタパターン
6a〜6c キャパシタパターン
7 フィルタ回路入力部
8 フィルタ回路出力部
9a〜9c ボンディングパッド
2 リードフレーム(マウントエリア)
3 リードフレーム(ピン端子)
4 モールド樹脂
10a〜10c ボンディングワイヤ(GND接続用)
11 実装基板表面メッキパターン(PKG中央部)
12 実装基板表面メッキパターン(ピン部)
13 実装基板裏面メッキパターン
14 スルーホール
15 実装基板材
16 筐体
17 寄生インダクタンス成分(L_GND)に対応するパス
18 インダクタンス成分(L_GND_ISO)に対応するパス
Claims (8)
- 半導体装置と、
前記半導体装置を実装し、かつ、所定の電位に接続される実装基板と
を具備し、
前記半導体装置は、
入力信号のうち、所望周波数成分以外の高調波成分を前記実装基板に向けて流し、かつ、前記所望周波数成分を出力するためのフィルタ回路部
を具備し、
前記フィルタ回路部は、
前記実装基板における寄生インダクタンス成分よりも大きいインダクタンス成分
を具備する
電子装置。 - 請求項1に記載の電子装置において、
前記フィルタ回路部は、
前記高調波成分の周波数帯域に対応する共振回路部
を具備する
電子装置。 - 請求項2に記載の電子装置において、
前記共振回路部は、
前記インダクタンス成分と、
前記インダクタンス成分に直列に接続されたキャパシタと
を具備し、
前記インダクタンス成分と、前記キャパシタにおける容量との組み合わせは、前記高調波成分の周波数帯域に対応する
電子装置。 - 請求項2または3に記載の電子装置において、
前記フィルタ回路部は、
前記共振回路部以外の、別の共振回路部
をさらに具備し、
前記共振回路部は、前記所望周波数成分以外で、かつ、前記高調波成分以外の、別の高調波成分の周波数帯域に対応する
電子装置。 - 請求項4に記載の電子装置において、
前記フィルタ回路部は、
前記入力信号を入力する入力部と、
前記所望周波数成分を出力する出力部と、
前記入力部と、前記出力部との間に接続されたインダクタと
をさらに具備し、
前記共振回路部と、前記別の共振回路部とのそれぞれにおける一方の端部は、前記インダクタの両端に接続され、
前記共振回路部と、前記別の共振回路部とのそれぞれにおける他方の端部は、前記実装基板における前記寄生インダクタンス成分の両端に接続されている
電子装置。 - 請求項5に記載の電子装置において、
前記実装基板は、
前記寄生インダクタンス成分の一方の端部に接続された第1の裏面GNDパターンと、
前記寄生インダクタンス成分の他方の端部に接続された第2の裏面GNDパターンと
を具備し、
前記第1および前記第2の裏面GNDパターンは、絶縁されている
電子装置。 - 請求項1〜6のいずれかに記載の電子装置における
半導体装置。 - 請求項1〜6のいずれかに記載の電子装置における
実装基板。
Priority Applications (3)
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JP2009227499A JP2011077841A (ja) | 2009-09-30 | 2009-09-30 | 電子装置 |
US12/923,607 US20110074523A1 (en) | 2009-09-30 | 2010-09-29 | Electronic device |
CN2010105015240A CN102034766A (zh) | 2009-09-30 | 2010-09-30 | 电子装置 |
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JP2011077841A true JP2011077841A (ja) | 2011-04-14 |
JP2011077841A5 JP2011077841A5 (ja) | 2012-03-29 |
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US10056332B2 (en) * | 2016-09-05 | 2018-08-21 | Renesas Electronics Corporation | Electronic device with delamination resistant wiring board |
Citations (1)
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JP2009049242A (ja) * | 2007-08-21 | 2009-03-05 | Tdk Corp | 電子部品内蔵基板 |
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US5105172A (en) * | 1990-08-31 | 1992-04-14 | Texas Instruments Incorporated | Monolithically realizable radio frequency bias choke |
US5095285A (en) * | 1990-08-31 | 1992-03-10 | Texas Instruments Incorporated | Monolithically realizable harmonic trapping circuit |
US5063177A (en) * | 1990-10-04 | 1991-11-05 | Comsat | Method of packaging microwave semiconductor components and integrated circuits |
US6294966B1 (en) * | 1999-12-31 | 2001-09-25 | Hei, Inc. | Interconnection device |
US7660562B2 (en) * | 2004-06-21 | 2010-02-09 | M/A-Com Technology Solutions Holdings, Inc. | Combined matching and filter circuit |
JP2006165830A (ja) * | 2004-12-06 | 2006-06-22 | Renesas Technology Corp | 電子装置、ローパスフィルタ、および電子装置の製造方法 |
US7667557B2 (en) * | 2005-12-06 | 2010-02-23 | Tdk Corporation | Thin-film bandpass filter using inductor-capacitor resonators |
US7532092B2 (en) * | 2006-06-20 | 2009-05-12 | Tdk Corporation | Grounding strategy for filter on planar substrate |
-
2009
- 2009-09-30 JP JP2009227499A patent/JP2011077841A/ja active Pending
-
2010
- 2010-09-29 US US12/923,607 patent/US20110074523A1/en not_active Abandoned
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