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MC1496P bảng dữ liệu(PDF) 10 Page - ON Semiconductor |
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10 / 14 page MC1496, MC1496B http://onsemi.com 10 be introduced with or without modulation, provided its level is sufficiently high to saturate the upper quad differential amplifier. If the carrier signal is modulated, a 300 mVrms input level is recommended. Doubly Balanced Mixer The MC1496 may be used as a doubly balanced mixer with either broadband or tuned narrow band input and output networks. The local oscillator signal is introduced at the carrier input port with a recommended amplitude of 100 mVrms. Figure 29 shows a mixer with a broadband input and a tuned output. Frequency Doubler The MC1496 will operate as a frequency doubler by introducing the same frequency at both input ports. Figures 30 and 31 show a broadband frequency doubler and a tuned output very high frequency (VHF) doubler, respectively. Phase Detection and FM Detection The MC1496 will function as a phase detector. High−level input signals are introduced at both inputs. When both inputs are at the same frequency the MC1496 will deliver an output which is a function of the phase difference between the two input signals. An FM detector may be constructed by using the phase detector principle. A tuned circuit is added at one of the inputs to cause the two input signals to vary in phase as a function of frequency. The MC1496 will then provide an output which is a function of the input signal frequency. VS DSB MC1496 VCC 12 Vd − R1 + Carrier Input 60 mVrms Carrier Input 1.0 k 1.0 k Carrier Null Carrier Adjust 1.0 k Re 1.0 k 2 RL 3.9 k 3 RL 3.9 − + 12 6 6.8 k I5 VEE −8.0 Vdc 10 k 10 k 51 51 Modulating Signal Input VC 14 5 0.1 mF 0.1 mF 50 k + − MC1496 Output 0.1 mF 0.1 mF 0.1 mF VCC 12 Vdc 10 k 100 100 10 k 3.0 k 3.0 k 1.0 k 1.3 k 820 50 k 10 k 10 mF 15 V Signal Input 300 mVrms Modulating Carrier Null + 25 mF 15 V 51 25 mF 15 V 2 3 14 5 Modulating Signal Input VS VC 1.0 mF Carrier Input 50 k 750 51 51 750 VEE −8.0 Vdc 15 6.8 k RL 3.9 k Re 1.0 k 23 14 5 0.1 mF −Vo +Vo VCC 12 Vdc 51 51 1.0 k 1.0 k MC1496 2 3 14 5 MC1496 1.3 k 820 1.0 k Carrier Input 300 mVrms SSB Input 51 100 3.0 k 3.0 k 0.005 mF 10 k 0.1 mF 1.0 k 0.1 mF 0.1 mF 0.1 mF 0.1 mF VCC 12 Vdc AF Outp RLq 10 0.005 mF TYPICAL APPLICATIONS 1.0 k 8 4 1 10 12 6 12 6 12 6 RL 3.9 k 8 4 1 10 8 4 1 10 8 4 1 10 Figure 25. Balanced Modulator (12 Vdc Single Supply) Figure 26. Balanced Modulator−Demodulator Figure 27. AM Modulator Circuit Figure 28. Product Detector (12 Vdc Single Supply) 1.0 k 0.005 mF |
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