An electronically tunable filter at 1 GHz is presented. The filter uses a suspended substrate design and commercially available varactors for filter tuning. The filter has a 60% tuning range from 700 MHz to 1.33 GHz with a low insertion loss (better
FEATURES I/Q Demodulator RF frequency 400 MHz to 6000MHz IIP3 +31 dBm IIP2 +60dBm Input P1dB +12dBm NF 13.2 dB @ 2.5GHz Voltage Conversion Gain of 4dB Quadrature demodulation accuracy Phase accuracy <0.5° Amplitude balance <0.25 dB LO Input –1
