This paper mainly explores how oversampling and feedback can be employed in high-resolution modulators to extend the signal bandwidth into the range of megahertz, where oversampling ratio is constrained. A 2-1 cascaded multi-bit architecture suitable for broad-band applications is presented, and a linearization technique referred to as partitioned data weighted averaging (DWA) is introduced to ...

Sigma delta modulation M has become a widespread method of analogue to digital conversion however its operation has not been completely de ned The majority of the analysis carried out on the circuit has been from a linear standpoint with non linear analysis hinting at hidden complexities in the modulator s operation The sigma delta modulator itself is a non linear system consisting as it does o...

Pulse width modulation and pulse density are deemed to be main techniques, even PDM could not emulate PWM, in terms of, basically, simplicity. bitstream is encoded through sigma-delta modulation. Since modulation, compared needs very high switching frequency more complicated materials compose circuits, it’s difficult design one. In this article we a low-power class-D audio amplifier circuit whe...

Continuous-time delta sigma (CT-4Σ) ADCs are established as the data conversion architecture of choice for the next-generation wireless applications. Several efforts have been made to simultaneously improve the bandwidth and dynamic range of 4Σ ADCs. We proposed using two-step quantizer in a single-loop CT-4Σ modulator to achieve higher conversion bandwidth. This paper presents a tutorial for e...

This paper presents a BIST scheme to test and calibrate on-chip DAC and ADC and to improve both linearity and resolution of converters using a built-in sigma-delta modulator. We use a dithering dynamic element matching (DEM) techniques. A first-order sigma-delta modulator is used to sample DAC outputs because of high linearity of its outputs with high oversampling rate (OSR). The scheme is capa...

This paper reported extensive study and research proposal of Post simulation and behavioral modeling of Second Order sigma-delta modulator BIST technique in which include non-ideality factor such as offset error and clock jitters. For the test of the digital parts, BIST techniques have been developed and are broadly implemented in current chips. BIST technique not only avoids depending on the o...