A 12-b, 30-MS/s, 2.95-mW Pipelined ADC Using Single-Stage Class-AB Amplifiers and Deterministic Background Calibration

作者：Kim Justin Kyung Ryun^*; Murmann Boris

来源：IEEE Journal of Solid-State Circuits, 2012, 47(9): 2141-2151.

DOI：10.1109/JSSC.2012.2194191

• Adaptive systems
• analog-to-digital conversion
• calibration
• linearization techniques
• parameter estimation
• spline
• switched-capacitor circuits

A 12-b 30-MS/s pipelined ADC is realized using single-stage, low-gain, class-AB amplifiers, which can dynamically provide the load currents without large static currents. In addition, the amplifiers are power cycled and turned on only during residue amplification to enable further power savings. Nonlinear errors due to finite gain are addressed using a deterministic digital background calibration scheme. The amplifier's transfer function is piecewise modeled in our calibration scheme using three third-order polynomial functions (splines) for low computational overhead. The presented ADC occupies an active area of 0.36 mm in 90-nm CMOS. It dissipates 2.95 mW from a 1.2-V supply and achieves an SNDR of 64.5 dB for inputs near Nyquist. The corresponding figure of merit is 72 fJ/conversion-step.

• 出版日期2012-9