LNA AND RF VGA FOR BROADBAND AND WIDE DYNAMIC RANGE DVB-S2 RECEIVER TUNER IN 0.18 µM CMOS PROCESS

Abstract

We present a design of broadband and wide dynamic range low noise amplifier/radio
frequency variable gain amplifier (LNA/RF VGA) for digital video broadcasting – satellite (DVBS2) receiver tuner integrated circuit fabricated using the 0.18 µm complementary metal oxide
semiconductor (CMOS) process. The MOS switching filter was used to get broadband characteristics
of the LNA circuit and the MOS channel resistance with two attenuators was used to obtain a wide
dynamic range characteristic of the RF VGA. The LNA/RF VGA block achieved a gain control range
of 50 dB, IIP3 of +15 dBm at low gain mode and a noise figure of 6.3 dB at the frequency range of
950 MHz ~ 2150 MHz. The RF VGA circuit consumed a total current of 28 mA with the supply
voltage of 1.8 V and the chip area was 1.4 mm × 0.6 mm including I/O pads.