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TDA5744 Folha de dados(PDF) 10 Page - NXP Semiconductors |
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TDA5744 Folha de dados(HTML) 10 Page - NXP Semiconductors |
10 / 20 page 1998 Mar 09 10 Philips Semiconductors Preliminary specification Low power mixers/oscillators for hyperband tuners TDA5744; TDA5745 Fig.6 Cross modulation measurement in the VHF band. (1) N1 is 2 × 5 turns. (2) N2 is 2 turns. Zi >> 50 Ω⇒ Vi =2 × Vmeas; V’meas =Vo − 16 dB (transformer ratio and transformer loss). Wanted input signal Vi =80dBµV at wanted fRF = 45.25 MHz (399.25 MHz). Measured level of the unwanted output signal Vou causing 1% AM modulation in the wanted output signal; unwanted fRF = 50.75 MHz (404.75 MHz); Vou =V’meas +16dB. N1 N2 -------- 5 = handbook, full pagewidth unwanted signal source eu ew 50 Ω 50 Ω wanted signal source 50 Ω MGL275 D.U.T. 18 dB attenuator 50 Ω o V FILTER 38.9 MHz modulation analyzer HYBRID AC BD V RMS voltmeter Vi AM = 30% meas V' VHFIN IFOUT1 IFOUT2 C T 50 Ω V Vmeas RMS voltmeter (1) N1 (2) N2 Fig.7 Cross modulation measurement in the UHF band. handbook, full pagewidth unwanted signal source 50 Ω 50 Ω wanted signal source 50 Ω 50 Ω MGL276 D.U.T. 18 dB attenuator 50 Ω o V FILTER 38.9 MHz modulation analyzer HYBRID AC BD HYBRID AC BD V RMS voltmeter Vi AM = 30% eu ew (1) N1 (2) N2 UHFIN1 IFOUT1 IFOUT2 UHFIN2 C T 50 Ω V Vmeas RMS voltmeter (1) N1 is 2 × 5 turns. (2) N2 is 2 turns. Vi =Vmeas; V’meas =Vo − 16 dB (transformer ratio and transformer loss). Wanted input signal Vi =70dBµV at fRF = 407.25 MHz (855.25 MHz). Measured level of the unwanted output signal Vou causing 1% AM modulation in the wanted output signal; unwanted fRF = 412.75 MHz (860.75 MHz); Vou =V’meas +16dB. N1 N2 -------- 5 = |
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