Design Techniques for 1GHz Downconversion ICs Fabricated in a 1μm 13GHz BiCMOS Process
The integration of a low-noise amplifier (LNA) with a wide dynamic-range mixer has been accomplished by employing an advanced BiCMOS process. The LNA features a 2dB noise figure with 16dB of gain at 900MHz and is internally matched to 50 ohms. A through mode is implemented with a FET switch to handle large signals and save power. The amplifier is stabilized versus temperature and supply voltage. The mixer is a single-balanced common-base design to achieve wide dynamic range. The RF and LO ports are matched to 50 ohms and the IF port is high impedance to simplify matching to SAW IF filters. The input third-order intercept is +6dBm, which allows the downconverter to handle large interfering signals without affecting the receiver performance. The overall design is ESD protected by a new active clamping network, and the 1.31 × 1.16mm2 die fits in a 14 pin surface-mount package. A special shielding arrangement is used on chip in combination with coplanar circuit board layout to achieve 46dB of antenna isolation from the local oscillator. The overall supply current is 13mA from +5V.
KeywordsSurface Acoustic Wave Intermediate Frequency Human Body Model Bandgap Reference NMOS Device
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