The authors show how continuous-time active-RC filters can be implemented in CMOS by replacing all resistors by MOSFETs operating in the linear region. As an example, a 24MHz activeMOSFET-C single-amplifier biquadratic lowpass filter with a pole-Q of 3 implemented in a 0.6μm CMOS process is discussed. By comparing measurements of a test chip, simulations and calculations, the following conclusi...

Fig. 1 N-path Time-interleaved ADC • In this paper, we propose a new calibration scheme suitable forimproving the fidelity of data-conversion in an array of ADCs, which is otherwise degraded largely due to mismatches in the non-ideaI behaviours among the individuaI ADCs in the array. This work will focus on correcting the ill-effects suffered by the array of ADCs due to mismatches in gain and o...

The spurious-free dynamic range (SFDR) of a MOSFET–C filter can be increased greatly by generating its tuning voltage with a charge pump. In this paper, we apply this technique to build a Sallen-and-Key lowpass filter with a pole frequency of 24 MHz and a pole Q of 3. It has an SFDR better than 50 dB and consumes 16 mW from a 3.3 V supply. Implemented with a doublepoly triple-metal 0.6m CMOS pr...

Partial randomization dynamic element matching (DEM) was recently introduced as a promising DEM technique for low harmonic distortion digital-to-analog conversion. The DEM technique is well suited for applications such as direct digital synthesis in wireless communication systems for which low hardware complexity is essential in addition to low harmonic distortion. Previously reported simulatio...

This work describes a 10-bit 40MS/s pipelined analog-to-digital converter (ADC) which is used in IEEE 802.11a WLAN system. This pipelined ADC is consisted of one sample-and-hold (S/H) circuit and nine uniform pipelined stages. In this pipelined ADC, the resolution for the S/H circuit and each single pipelined stage is up to 12 bit and 14 bit respectively at 8 MHz input frequency. The spurious f...

Its wide dynamic range makes the spectrum analyzer the test instrument of choice for measuring harmonic distortion, intermodulation distortion, adjacent channel power ratio, spurious-free dynamic range, gain compression, etc. Distortion measurements such as these are bounded on one side by the noise floor of the spectrum analyzer and on the other side by the signal power strength at which the s...

Design and experimental validation of a simple photonic phase-lockedloop (PPLL) linear phase demodulator employing a novel attenuating counter propagating (ACP) in-loop phase modulator are presented. The ACP in-loop phase modulator is free of propagation delay, allowing stable operation of the PPLL with large gain. Highly linear optical phase demodulation was observed and the measured spurious ...