Design of Broadband LNA and RFVGA for DVB Receiver Tuner using CMOS $0.18-\mu\mathrm{m}$ Process

In this work, a broad-band CMOS low-noise amplifier (LNA) and a radio-frequency variable-gain amplifier (RFVGA) were designed and fabricated for a digital video broadcasting-satellite receiver tuner integrated circuit using the CMOS 0.18-μm mixed-mode RF process. A MOS-switching filter was applied to the LNA. This technique shows that several narrow frequency bands are selected by digital control, and 16 band selections are available via a four-bit control. The RFVGA is designed and connected to three identical circuits to achieve a wide gain dynamic range. In addition, separate modes, good noise-figure performance, and high-linearity characteristic, were simultaneously obtained. The fabricated module achieved a 60 dB gain dynamic range, below 8 dB NF, 11 dBm third-order input intercept point, and 18.3 dBm second-order input intercept point at a -15 dB voltage gain with a chip size of 830×650 μm
²
.