A 100-3000MHz, up/ down-convert, +29dBm IIP3, 13dB NF, active mixer with integrated fractional-N PLL and VCO

This paper presents a broadband, high-dynamic range, active mixer with integrated PLL and VCO. The synthesizer uses a programmable integer-n/fractional-n PLL to generate an LO signal with an in-band phase noise FOM of -223 dBc/Hz/Hz. The 100-3000 MHz active mixer can be configured for up or down conversion. The mixer's linearity can be boosted from +25 dBm to +29 dBm by increasing the bias current, and optimized for a wide range of input frequencies through a variable capacitor setting. Designed in Si-Ge 0.25 μm BiCMOS, the entire chip occupies 5.84 mm² and consumes 250 mA from a 5 V supply.