Multi-Standard △∑ Modulator: Analysis
Kluwer Academic Publishers eBooks · 2005
The programmable ΔΣ modulator is one of the major building blocks in the multi-standard receiver. By adjusting the OSR and reconfiguring the circuit, it behaves as a Mbit, 12bit and 7bit A/D converter for 100KHz, 700KHz and 2.5MHz signals for GSM, DECT and WCDMA systems, respectively. Based on these specifications, the modulator system is simulated using MATLAB software. The simulation verifies the functionality of the modulator. The non- idealities in real circuits, such as thermal noise, mismatch, nonlinearity, finite OTA gain and etc, are taken into account in the simulation and the specifications of every building block in the modulator are derived accordingly.