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MC13110A Datasheet(PDF) 20 Page - Motorola, Inc |
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MC13110A Datasheet(HTML) 20 Page - Motorola, Inc |
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20 / 68 page  MC13110A/B MC13111A/B 20 MOTOROLA ANALOG IC DEVICE DATA FIRST AND SECOND MIXER Mixer Description The 1st and 2nd mixers are similar in design. Both are double balanced to suppress the LO and the input frequencies to give only the sum and difference frequencies at the mixer output. Typically the LO is suppressed better than –50 dB for the first mixer and better than –40 dB for the second mixer. The gain of the 1st mixer has a –3.0 dB corner at approximately 13 MHz and is used at a 10.7 MHz IF. It has an output impedance of 300 Ω and matches to a typical 10.7 MHz ceramic filter with a source and load impedance of 330 Ω. A series resistor may be used to raise the impedance for use with crystal filters. They typically have an input impedance much greater than 330 Ω. First Mixer Figures 17 through 20 show the first mixer transfer curves for the voltage conversion gain, output level, and intermodulation. Notice that there is approximately 10 dB linearity improvement when the “IP3 Increase” bit is set to <1>. The “IP3 Increase” bit is a programmable bit as shown in the Serial Programmable Interface section under the Rx Counter Latch Register. The IP3 = <1> option will increase the supply current demand by 1.3 mA. Figure 13. First Mixer Input and Output Impedance Schematic 1st Mixer Mix1 In Mix1 Out RPI CPI RPO CPO Figure 14. First Mixer Output Impedance Unit Output Impedance B IP3 = <0> (Set Low) 304 Ω // 3.7 pF B IP3 = <1> (Set High) 300 Ω // 4.0 pF Figures 13, 14, and 16 represent the input and output impedance for the first mixer. Notice that the input single–ended and differential impedances are basically the same. The output impedance as described in Figure 14 will be used to match to a ceramic or crystal filter’s input impedance. A typical ceramic filter input impedance is 330 Ω while crystal filter input impedance is usually 1500 Ω. Exact impedance matching to ceramic filters are not critical, however, more attention needs to be given to the filter characteristics of a crystal filter. Crystal filters are much narrower. It is important to accurately match to these filters to guaranty a reasonable response. To find the IF bandwidth response of the first mixer refer to Figure 22. The –3.0 dB bandwidth point is approximately 13 MHz. Figure 15 is a summary of the first mixer feedthrough parameters. Figure 15. First Mixer Feedthrough Parameters Parameter (dBm) 1st LO Feedthrough @ Mix1 In1 –70.0 1st LO Feedthrough @ Mix1 Out –55.5 RF Feedthrough @ Mix1 Out with –30 dBm –61.0 Figure 16. First Mixer Input Impedance over Input Frequency Ui US Center Channels France Center Channels Unit 49 MHz 46 MHz 41 MHz 26 MHz Single–Ended 1550 Ω // 3.7 pF 1560 Ω // 3.7 pF 1570 Ω // 3.8 pF 1650 Ω // 3.7 pF Differential 1600 Ω // 1.8 pF 1610 Ω // 1.8 pF 1670 Ω // 1.8 pF 1710 Ω // 1.8 pF Note: 11. Single–Ended data is from measured results. Differential data is from simulated results. |
Similar Part No. - MC13110A |
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Similar Description - MC13110A |
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