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This paper reports a CO2 sensor intended for indoor air-quality sensing. Both the thermal-conductivity-based CO2 transducer and its readout circuit have been realized in 0.16µm CMOS technology. The readout circuit, based on an incremental ΔΣ ADC, employs ratiometric measurements to circumvent the need for a stable power reference. The sensor achieves 228ppm (1σ) CO2 resolution in a 70s measurement...
The jitter of the sampling clock imposes a limitation on the maximum dynamic range that can be achieved in A/D and D/A converters. This is due to the fact that the sampled input signal will also be contaminated with the same clock jitter. This paper presents a method to remove jitter from the sampled signal. A clean reference signal is added to the input of the converter to extract clock jitter in...
The SigmaDelta modulator presented in this paper exploits the advantages of new CMOS technologies by digitization on both architectural and circuit level. The target DR of the modulator is 77dB in 200kHz.
A quadrature cascaded modulator with continuous-time loop filters is presented for a digital multi-stream FM radio receiver. The ADC achieves a dynamic range of 77 dB and 20 MHz bandwidth centered on an intermediate frequency of 10.5 MHz and is sampling at 340 MHz. The cascaded modulator comprises programmable analog second-order quadrature filters and a digital quadrature noise cancellation filter...
This paper presents an overview of recent developments in continuous-time sigma-delta modulator design. Traditionally, sigma-delta modulators have been used for audio applications with low bandwidth and high-resolution requirements. Nowadays, the area of sigma-delta modulation has extended and sigma-delta modulators are widely used in multi-mode communication receivers with different bandwidth and...
The analog-to-digital (AD) converter in modern multi-band multi-mode software defined radios plays a very important role. This paper will show how the specifications for the clock of a sigma-delta AD-converters can be derived. In contrast to literature, where clock jitter (in psrms) is specified, a different approach will be taken, in which the frequency dependent spurious of the clock signal can...
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