Ultra-Wideband, High Linearity I/Q Demodulators 120 DC Offset IIP2 Optimization Cancellation I 700MHz to 3GHz 100 IIP2 (dBm) LTC5585 0° 25.7dBm IIP3 at 1.9GHz I, –40°C I, 25°C I, 85°C I, 105°C 110 Q, –40°C Q, 25°C Q, 85°C Q, 105°C fRF = 1950MHz 90 80 70 60 90° 50 Q 40 LO 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 IP2I, IP2Q (V) DC Offset Adjustable to Zero 130 IIP2 DC Offset Optimization Cancellation I 30MHz to 1.4GHz 110 IIP2 (dBm) LTC5584 0° 31dBm IIP3 at 450MHz 90 80 LO 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 IP2I, IP2Q (V) Demodulation Bandwidth Extendable from 250MHz to 600MHz with <0.5dB Gain Flatness AC CURRENT SOURCE 6pF PACKAGE PARASITICS 1.5nH I+ 1.5nH I– 0.2pF 0.2pF L 18nH L 18nH RPULL-UP 100Ω RPULL-UP 100Ω 4.7pF RLOAD(DIFF) 200Ω 4.7pF 30mA LLTC5584/LTC5585 –0.5dB BW = 630MHz CONVERSION GAIN (dB) 100Ω 1k 30mA 100 50 VCC 100Ω fRF = 450MHz 60 VCC 6pF Q, –40°C Q, 25°C Q, 85°C Q, 105°C 70 90° Q I, –40°C I, 25°C I, 85°C I, 105°C 120 5 4 3 2 1 0 –1 –2 –3 –4 –5 –6 –7 –8 –9 –10 TC = 25°C 1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 BASEBAND FREQUENCY (GHz) GND R = 100Ω, BW = 250MHz L = 18nH, C = 4.7pF, R = 200Ω, BW = 630MHz L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Linear’s Quadrature I/Q Demodulator Family Parameters LTC5585 LTC5584 LT5575 LT5517 LT5515 LT5516 700MHz to 3GHz 30MHz to 1.4GHz 800MHz to 2.7GHz 40MHz to 900MHz 1.5 to 2.5GHz 800MHz to 1.5GHz = RF = RF = RF = 2xLO = RF = RF Baseband Bandwidth (–3dB) 530MHz 530MHz 490MHz 130MHz 260MHz 260MHz IIP3 Operating Frequency Range LO Input Frequency 25.7dBm 31dBm 22.6dBm 21dBm 20dBm 21.5dBm IIP2 (Before Adjustment) 60dBm 70dBm 60dBm 58dBm 51dBm 52dBm IIP2 (After Adjustment) >80dBm >80dBm – – – – Yes Yes No No No No Conversion Gain (Voltage) 2.4dB 5.4dB 4.2dB 3.3dB –0.7dB 4.3dB Input P1dB 16dBm 13.6dBm 11.2dBm 10dBm 9dBm 6.6dBm Noise Figure 12.7dB 9.9dB 12.7dB 12.4dB 16.8dB 12.8dB 14.6dB at 0dBm 13.6dB at 0dBm 20dB at 0dBm – – – 0.05dB 0.02dB 0.01dB 0.03dB 0.3dB 0.2dB 0.7° 0.25° 0.4° 0.7° 1° 1° DC Offset Cancellation Noise Figure Under Blocking I-Q Amplitude Mismatch I-Q Phase Mismatch Supply Voltage 5V 5V 5V 5V 5V 5V Supply Current 200mA 200mA 132mA 90mA 125mA 117mA 4mm × 4mm QFN-24 4mm × 4mm QFN-24 4mm × 4mm QFN-16 4mm × 4mm QFN-16 4mm × 4mm QFN-16 4mm × 4mm QFN-16 Package Design Note DN1027 Optimizing the Performance of Very Wideband Direct Conversion Receivers Download Design Note: www.linear.com/DN1027 www.linear.com/5585 n 1-800-4-LINEAR 0612