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A 1.2 V 12-bit 150 MS/s pipelined ADC with low-gain op-amps (DC gain ≈15 dB) is fabricated in a 65-nm CMOS process. The proposed 5-transistor single stage op-amp enables simple analog circuit to achieve low power and high speed. Digital background calibration technique is exploited to compensate the inter-stage gain error, capacitor mismatch and(More)
Conversion from dc to the 10th Nyquist band is enabled in a SHA-less, 10-b, 100-MS/s pipelined ADC by digitally calibrating the clock skew in the 3.5-b front-end stage. Architectural redundancy of pipelined ADC is exploited to extract skew information from the first-stage residue output with two out-of-range comparators and some simple digital logic; a(More)
Frequency compensation of active-RC elliptic filter is enabled for the first time by employing a derivative-free architecture. In conjunction with a built-in automatic unity-gain band-width (&#x03C9;<inf>u</inf>) tracking scheme, the prototype 4th-order active-RC elliptic low-pass filter (LPF) measures a digitally programmable bandwidth of 14&#x2013;23 MHz,(More)
The design of a third-order single-bit discrete-time &#x03A3;&#x0394; modulator for low-power energy meter application is presented. The modulator employs an input feed-forward topology in order to reduce internal signal swings, thus relaxes the linearity and slew rate requirements on amplifiers. A partially switched amplifier is utilized in the first(More)
This paper presents an improved DC-offset cancellation (DCOC) circuit for programmable-gain amplifier (PGA) in power line communication. It is a speed-enhanced and low-noisy method by using current-mode feedback. The output DC-offset can be reduced from several hundred millivolts to less than 5mV over 64 dB gain range. Furthermore, this proposed technique(More)
This paper presents an interface readout circuit for Micromachined capacitive accelerometer. An analog closed-loop switched-capacitor (SC) interface circuit is proposed to achieve high linearity and large dynamic range of the sensor. Correlated double sampling (CDS) technique is used in SC circuits to minimize offset and 1/f noise of the amplifier. The(More)