Reconfigurable multi-band quadrature ΣΔ modulators

A new design methodology for reconfigurable quadrature band-pass ΣΔ modulator is proposed. The methodology uses architectures, which locks various range of IF frequencies to the sampling frequency for lower order quadrature modulators. A generalized integrator based architecture is developed from the delay architectures. The method is presented with derivation of the base circuitry and with this base circuitry stringent performance can be satisfied by extending the work to cascading lower order quadrature modulators with possible image reduction techniques.