This paper proposes CMOS LC-tank divide-by-3 injection locked frequency dividers (ILFDs) fabricated in 0.18 μm and 90nm CMOS process and describes the circuit design, operation principle and measurement results of the ILFDs. The ILFDs use two injection series-MOSFETs across the LC resonator and a differential injection signal is applied to the gates of injection MOSFETs. The direct-injection di...

A spatially distributed radio-frequency (RF) circuit, microwave, or millimeter-wave circuit does not have a global reference node as required in conventional nodal analysis. Instead, local reference nodes associated with ports are required. This paper adapts modified nodal analysis to accommodate spatially distributed circuits, allowing conventional harmonic balance and transient simulators to ...

ワイヤレス給電システムの一般的ブロック構成を示し，各ブロックの設計開発に役立つ基本理論を紹介する．結合系の最大電力伝送効率を支配するkQ 理論を述べる．一般化kQ 式を用いることで，電界や磁界など様々な結合方式の設計が可能になる．インピーダンスと反射率の関係を直感的に捉えることができる複素数平面を示す．この平面上でインピーダンスを頂点とする三角形の二辺の長さの比が反射率である．反射率と定在波比の関係を視覚的に捉えるための教材として考案されたゴムひもモデルを示す．このゴムひもモデルを使えば，数式も電卓も用いることなく，計算尺のような感覚で定在波比の振舞いを習得できる．結合系において，入力ポートと出力ポート両方で同時に整合をとることの重要性を述べる．電圧定在波比を二乗した電力定在波比の導入で，従来のスミス図表の中心付近が拡大される．インピーダンス平面上の2 点間を結ぶ曲線の長さを回路設計...

A photonic integrated circuit (PIC) comprised of an 11 cm long multimode speckle waveguide, a 1 × 32 splitter, and linear grating coupler array is fabricated utilized to receive 2 GHz radio-frequency (RF) signal bandwidth from 2.5 4.5 using compressive sensing (CS). Incoming RF signals are modulated onto chirped optical pulses which input the waveguide. The waveguide produces random projections...

We demonstrate that a continuously measured microelectronic circuit, the Cooper-pair box measured by a radio-frequency single-electron transistor, approximates a quantum two-level system. We extract the Hamiltonian of the circuit through resonant spectroscopy and measure the excited-state lifetime. The lifetime is more than 10(5) times longer than the inverse transition frequency of the two-lev...