Estimation of spurious-free dynamic range for recursive active microwave integrated filters

Noise and Intermodulation Properties of Tunable Recursive Active MMIC Filters for Future Adaptive On-chip Radar Receivers

“…Measurement results together with simulations using HP EEsof CAD tool Libra are presented for two different recursive active MMIC filter designs. These results are compared with the theoretical results from our published analytical filter models [7], [8] and [9]. …”

“…In order to maximise the filter third order input intercept point (IIP3) the two couplers should be designed with values of β 1 and β 2 close to one [9]. However, according to an analytical evaluation of the optimum noise figure of recursive active MMIC filters [7], the coupler located at the input should be designed with a value of β 1 close to zero while the output coupler should be designed with β 2 equal to V 1/2 when we want to minimise the filter noise figure NF.…”

“…In an analytical study of the optimum filter noise figure [6], this filter type was shown to be promising for receiver front-ends where it could potentially replace the classical cascade of an LNA and a passive filter. Analytical studies of the third order intercept point and the optimum filter noise figure for two different recursive active MMIC filter topologies as a function of filter Q-value were first presented in [7], [8] and [9] respectively. Starting from the requirements of typical microwave receivers for future adaptive radars we investigate in this paper both theoretically and experimentally the possibilities and the limitations of tunable narrow band recursive active MMIC filters with respect to such on-chip radar receivers.…”