TFS 167 G

      Reference level for the relative attenuation arel of the TFS 167G is the maximum of the pass band attenuation amax. The maximum of the pass band attenuation amax is defined as the insertion loss ae. The centre frequency fc is the arithmetic mean value of the upper and lower frequencies at the 3dB filter attenuation level relative to the insertion loss ae. The nominal frequency fN is fixed at 167,0 MHz without tolerance.The given values for the relative attenuation arel and for the group delay ripple have to be reached at the frequencies given below even if the centre frequency fc is shifted due to the temperature coefficient of frequency TCf in the operating temperature range and due to a production tolerance for the centre frequency fc.
     There are some datas about it under the coditions which is as follows: Ambient temperature is 23 C;Input power level is 0 dBm;Terminating impedances:Input is 325 || -8.0 pF and Output is 325 || -8.0 pF . Those datas are as follows: Insertion loss at fN (reference level) is 1.4 dB typ and max. 3.0 dB. Nominal frequency (fN) is 167.0 MHz. Pass band(PB) is 318kHz typ and fN±75 kHz. Amplitude variation in PB is max.1 dB. Amplitude ripple in PB (p-p) is max.0.5 dB. Relative attenuation(arel) is 9.0dB typ and min.5 dB. Absolute group delay in PB is 1.71s typ and max.5 dB. Group delay ripple in PB is 240 ns typ and min.100 dB.Input Return loss is 18,0 dB typ and min. 15.0 dB.Output Return loss is 20.0 dB typ and min. 10.0 dB.Operating temperature range is - 5 °C to + 85 °C.Storage temperature is - 40 °C to + 90 °C. Temperature coefficient of frequency is 40°C typ.( note:The terminating impedances depend on parasitics and q-values of matching elements and the board used, and are to be understood as reference values only. Should there be additional questions do not hesitate to ask for an application note or contact our design team.)
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