A Monolithic Low Noise Channelized Active Bandpass Filter Using GaAs 0.15 µm Technology

Abstract

ABSTRACTIn this study, a monolithic microwave integrated circuit channelized active bandpass filter using noise cancelling circuit is presented. We propose a new structure on the channelized bandpass filter. By adding output currents of three bandpass filters and using current to voltage converter, the proposed three-channel bandpass filter is achieved. In designing each bandpass filter, a recursive differential structure has been used. Also, to decrease the noise of this filter, a new noise cancelling circuit operated in a wide range from 1 to 7 GHz is investigated. By using this circuit, input impedance matching is obtained simultaneously. The chip has been implemented using GaAs 0.15 µm technology and occupies an area of 2.5 × 2.4 mm2. The post layout simulation results show a noise figure of 1.4–3.7 dB with a good input and output impedance matching less than −10 dB. The centre frequencies of channelized filter are 2, 4, and 6 GHz while the voltage gains are 18, 12, and 10 dB, respectively. The circuit power consumption is 250 mW.