JP2016028458A - 集積回路素子内でキャパシタをデジタル処理で同調するときに用いられる方法及び装置 - Google Patents
集積回路素子内でキャパシタをデジタル処理で同調するときに用いられる方法及び装置 Download PDFInfo
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Abstract
【解決手段】 第1及び第2の端子の間に適用されるキャパシタンスをデジタル的に制御することを可能にするデジタル同調キャパシタDTCが記載される。幾つかの実施形態では、第1の端子はFW+端子を有し、第2の端子はRF端子を有する。幾つかの実施形態では、DTCは、最下位ビット(LSB)から最上位ビット(MSB)まで重要性で順序付けられた複数のサブ回路を有し、複数の有効ビットのサブ回路は一緒に並列に結合され、各サブ回路は第1のRF端子に結合された第1の節点と第2のRW端子に結合された第2の節点とを有する。DTCはデジタル制御ワードを受信する入力手段を更に有し、デジタル制御ワードは、同様にLSBからMSBまで重要性で順序付けられたビットを有する。
【選択図】図6B
Description
本願明細書を通じて、示される好適な実施形態及び例は、例として考えられるべきであり、本発明を限定すると考えられるべきではない。
表1
上述のデジタル同調キャパシタ(DTC)の方法及び装置は、有利なことに、広範な回路正方及びDTCの大きさの特性を最大限に利用するよう又は満足するよう設計されてよい。これらの設計特性及び「トレードオフ」を用い、DTCはシステム・プロバイダにより課される仕様及び要件を満たすようカスタマイズされ最適化されうる。
例えば、図11は、選択された最小Qファクタ値(Qmin)における、DTCの調整範囲対適用信号の周波数のグラフ1100を示す。図11に2つの曲線が示される。第1の曲線1102は、調整範囲が変化するときの最小Qファクタ50を有する第1のDTCの調整範囲を適用信号の周波数の関数として示す。第2の曲線1104は、調整範囲が変化するときの最小Qファクタ100を有する第2のDTCの調整範囲を適用信号の周波数の関数として示す。式1−6を参照して上述したように、最小Qファクタ値(Qmin)及び調整範囲(Cmax/Cmin)は、動作原理及び本発明の教示のDTCの設計により互いに強く関連する。本発明のDTCの最小Qファクタは、DTCのオン抵抗値RON及びDTCのオフ・キャパシタンスCOFF(つまり、RONCOFF)に依存する。図11の曲線1102及び1104は、RONCOFF=600fF−Ωとして描かれている。
図4A、5A−5B、6、8A、8F、9A及び9Fを参照して上述したように、動作原理及び本発明のDTCの教示の設計技術により、DTCのダイ面積要件はDTCの最大キャパシタンス(Cmax)(つまり、DTCにより達成可能な最大キャパシタンス)に比例する。図13を参照すると、曲線1302は、最大DTCキャパシタンス(Cmax)が増大するにつれ、FETダイ面積要件(つまり、DTCのFETのダイ面積要件)がどのように増加するかを示す。曲線1302は、FETダイ面積と6個のシャントFETのスタック(これにより、約+35dBmのDTC電力処理能力を提供する)を有するDTCのCmaxとの間の関係を示す。曲線1304は、FETダイ面積と5個のシャントFETのスタック(これにより、約+33.4dBmのDTC電力処理能力を提供する)を有するDTCのCmaxとの間の関係を示す。予想通り、低い電力処理要件(及び少ない数のスタックされたFET)を有するDTCは、高い電力処理要件(従ってより多い数のスタックされたFET)を有するDTCよりも、少ないダイ面積を占有する。曲線1302、1304は次を想定している。つまり、900MHzにおいてQ=50;5ビットのキャパシタンス制御ワード;及びDTCは7:1の調整範囲を有する。FET(IN 0.4)の面積は、1Ωの単一のFETに対して80μm×80μmを有すると想定する。
DTCのCmaxの低減 ― 幾つかの設計トレードオフ及び設計条件は、DTCにより占有される集積回路ダイ面積を削減するために利用されうる。例えば、図13を参照して上述したように、動作原理及び本発明のDTCの教示の設計技術により、DTCのダイ面積要件はDTCの最大キャパシタンス(Cmax)(つまり、DTCにより達成可能な最大キャパシタンス)に比例する。従って、DTCの最大キャパシタンス(Cmax)が減少できれば、DTCにより必要とされるダイ面積も削減されうる。従って、DTCを最小の可能なダイ面積に最適化するために、最小の最大キャパシタンスCmaxを必要とするチューナのトポロジを用いることが有用である。例えば、結合された共振器又はチューナのトポロジは有意に良好である。例として、選択されたDTCの最大キャパシタンスCmaxの仕様が9.4pFから6.0pFに減少された場合、本発明の教示に従い作成された選択されたDTCにより必要とされるダイ面積は、36%=[(1)−(6/9.4)]だけ削減される。
仕様に準拠した調整可能な構成要素の利用可能性は、多帯域・マルチモードの携帯電話機のためのRFアーキテクチャに重大な影響を与えるだろう。本発明のDTCの方法及び装置は、限定でなく適応型インピーダンス整合、アンテナ帯域お世bいインピーダンスの調整、電力増幅器(PA)の出力整合の調整、RFフィルタ及び送受切り替え器の調整、調整可能なフィルタ及び再構成可能なフィルタ、アンテナ及びPAを含む多くの異なる環境及び用途で用いられうる。仕様は厳しく、また高電力処理(+35dBm)、高線形性(IMD3−105dBm)、低損失(Q>50−100)、高信頼性、3:1−8:1の調整範囲、高速切り替え(5μS)、低価格、量産可能などの要件を満たすことは困難である。調整可能な構成要素の一般的な要件は、UltraCMOSで実施されたDTCを、上述のDTCを実施するための優れた技術の候補にする端末のアンテナ・スイッチのための要件に必要に類似する。この特定の実施は、高電力処理及び線形性についてスタック・トランジスタの独自の能力に強く依存し、高いQのキャパシタを集積することができる。UltraCMOSの手法は、単に既存の一体に集積された単一ダイの固体の調整可能キャパシタであるように見え、全ての仕様を満たし、UltraCMOSの端末のアンテナ・スイッチと全て同一の利点を有する。有利なことに、上述のDTCは、MEMSの代替及びBSTの実施である完全に集積された素子に、高信頼性及び低価格で量産されうる。実績のある大容量のUltraCMOSスイッチ技術は、DTCを実施するために用いられうる。このプロセス技術は、シリアル又はパラレル・バス、デジタル不整合センサ、本発明のDTCを支援するために用いられうる制御アルゴリズムを、幾つかの完全に集積されたソリューションの実施形態に一体に集積させる。有利なことに、DTCは、インピーダンス・チューナの用途、アンテナ調整、PA出力整合の調整、及び多くの他の有用な用途に使用可能である。
[関連出願の相互参照]
本出願は、発明の譲受人に譲渡された米国仮出願番号61/067634、2008年2月出願、発明の名称「Method and Apparatus for Digitally Tuning a Capacitor in an Integrated Circuit Device」の優先権の利益を主張する。上記米国仮出願は参照されることによりその全体が本願明細書に組み込まれる。
402、404、406、408 キャパシタ
402’、404’、406’、408’ FET
410 グランド端子
412 負荷端子
416 制御ロジック・ブロック
420、422、424 信号線
426 制御ワードCAPword
502 キャパシタ
503 サブ回路
504 FET
506、510 RF端子
602 サブ回路
604、620、622 キャパシタ
606、608、610、612、614、616 FET
618、680 RF端子
700 ユニット・セル
702 スタック
704 MIMキャパシタ
705 抵抗器
706、708、710、712、714、716 FET
718、780 RF端子
Claims (1)
- 集積回路素子内で用いられるデジタル的に調整されるキャパシタ(DTC)であって、
(a)第1のRF端子と、
(b)第2のRF端子と、
(c)選択された複数のb個のデジタル制御ワードビットを有するデジタル制御ワードを受信可能な入力手段であって、前記デジタル制御ワードは、前記第1及び第2のRF端子の間に適用されたキャパシタンスを選択的に制御する、入力手段と、
(d)1つのユニット・セル及び複製されたユニット・セルと
を有し、
前記複製されたユニット・セルは、前記1つのセルを1又は複数回インスタンス化することにより、及び前記のインスタンスを並列に結合することにより、実装され、
前記1つのユニット・セル及び複製されたユニット・セルは、前記第1のRF端子に結合される第1のノードと前記第2のRF端子に結合される第2のノードとを有して並列に結合され、
前記1つのユニット・セル及び前記複製されたユニット・セルの各々は、関連し対応するデジタル制御ワードビットに、1対1の関係で結合され、
各ユニット・セルは、1又は複数のキャパシタに直列に結合された複数のスタックされたスイッチを有し、
前記デジタル制御ワードは、前記関連し対応するデジタル制御ワードビットにより、前記スタックされたスイッチの切り替え動作を選択的に制御することにより、前記キャパシタンスを選択的に制御する、
DTC。
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