A novel CMOS active polyphase filter with wideband and low-power for GNSS receiver

Abstract

In this letter, a novel circuit architecture for active polyphase filter is proposed and analyzed. The currents produced from two sourcefollower with capacitor and common-source stage in a single-stage are used to realize high-pass and low-pass functions, respectively. Compared to other conventional active polyphase filters, the proposed polyphase filter uses a simpler structure to achieve strong image rejection in a wide band while obtaining lower power consumption, higher operating frequency and smaller chip area. In the 0.18-µm CMOS process, the proposed active polyphase filter occupies less than 0.65 mm 2 of chip area. From the measurements, the active polyphase filter shows an image rejection ratio of 48.5 dB at frequencies of 5.5 MHz to 26.5 MHz, a voltage gain of 6.8 dB and an IIP3 of 3.8 dBm at 16 MHz while consuming only 3.1 mA from a 1.8-V supply.

Position and time deception based on satellite navigation technology and experimental verification

“…With the construction of global navigation satellite system and the great progress of receiver technology in low cost and low power consumption [1][2][3][4], the all-weather and high-precision positioning and timing services are widely used in production and life [5,6]. However, due to the weakness of satellite navigation signal and the disclosure of data format, the receiver is vulnerable to jamming and spoofing [7][8][9][10].…”

The design of large image rejection and wideband CMOS active polyphase filter for BeiDou RF receiver

“…In contrast with passive polyphase filters, active polyphase filters have the general advantages of small chip area, high signal gain and easy tuning. Many active polyphase filters have also been discussed in some literature [19,20,21,22,23,24,25,26,27,28,29,30], but few of them achieve strong image rejection at high operating frequency and low-power dissipation.…”