Abstract
A power-scalable reconfigurable complex band-pass filter for a multimode Global Navigation Satellite Systems (GNSS) receiver is presented. The filter can be reconfigured to work in either fifth-order or third-order mode. The intermediate frequency varies among 3.996, 4.8, 6, 7.161, 10.326, 12, 13.29 and 16MHz. The bandwidth varies among 2.2, 4.2, 6, 10 and 20MHz. An operational amplifier with power-scalable technique is adopted to lower down the power consumption. And an automatic tuning circuit is utilized to guarantee the accuracy of intermediate frequency and bandwidth. The filter has been implemented in 180nm CMOS process, which occupies 1240×600μm2 die area and consumes 3.6mA-8.5mA current from a 1.7V power supply provided by an on-chip band-gap.
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