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MC13110A Datasheet(PDF) 31 Page - Motorola, Inc |
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MC13110A Datasheet(HTML) 31 Page - Motorola, Inc |
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31 / 68 page  MC13110A/B MC13111A/B 31 MOTOROLA ANALOG IC DEVICE DATA RF System Performance The sensitivity of the IC is typically 0.4 µVrms matched (single ended or differential) with no preamp. To achieve suitable system performance, a preamp and passive duplexer may be used. In production final test, each section of the IC is separately tested to guarantee its system performance in the specific application. The preamp and duplexer (differential, matched input) yields typically –115 dBm @ 12 dB SINAD sensitivity performance under full duplex operation. See Figure 45 and 48. The duplexer is important to achieve full duplex operation without significant “de–sensing” of the receiver by the transmitter. The combination of the duplexer and preamp circuit should attenuate the transmitter power to the receiver by over 60 dB. This will improve the receiver system noise figure without giving up too much IMD performance. The duplexer may be a two piece unit offered by Shimida, Sansui, or Toko products (designed for 25 channel CT–0 cordless phone). The duplexer frequency response at the receiver port has a notch at the transmitter frequency band of about 35 to 40 dB with a 2.0 to 3.0 dB insertion loss at the receiver frequency band. The preamp circuit utilizes a tuned transformer at the output side of the amplifier. This transformer is designed to bandpass filter at the receiver input frequency while rejecting the transmitter frequency. The tuned preamp also improves the noise performance by reducing the bandwidth of the pass band and by reducing the second stage contribution of the 1st mixer. The preamp is biased such that it yields suitable noise figure and gain. The following matching networks have been used to obtain 12 dB SINAD sensitivity numbers: 1:5 15 1:5 15 Figure 60. Matching Input Networks Differential Match Single–ended Match Single–ended 50 Ω Mix1 In1 Mix1 In2 Mix1 In1 Mix1 In2 Mix1 In1 Mix1 In2 RF In1 RF In1 RF In1 360 680 39 39 49.9 Ω 0.01 0.01 The exact impedance looking into the RF In1 pin is displayed in the following table along with the sensitivity levels. Figure 61. 12 dB SINAD Sensitivity Levels, US Handset Application Channel 21 Sensitivity (dBm) Input Impedance (dBm) Differential matched –115.3 50.2 ± 0.1j Single–ended match –114.8 50.2 ± 0.1j Single–ended 50 Ω –100.1 50.2 ± 0.1j The graphs in Figures 64 to 69 are performance results based on Evaluation Board Schematic (Figure 138). This evaluation board did not use a duplexer or preamp stage. Figure 62 is a summary of the RF performance and Figure 63 contains the French RF Performance Summary. Figure 62. RF Performance Summary for US Applications MC13110A/MC13111A (fdev = 3.0 kHz, fmod = 1.0 kHz, 50 Ω) Parameter Handset Baseset Unit Sensitivity at 12 dB SINAD –100.1 –100.1 dBm Recovered Audio 132 132 mVrms SINAD @ –30 dBm 41.8 41.4 dB THD @ –30 dBm 0.8 0.8 % S/N @ –30 dBm 78.2 78.5 dB AMRR @ –30 dBm 73.4 72.2 dB RSSI range >80 >80 dB Figure 63. RF Performance Summary for US French Applications MC13110A/MC13111A (fdev = 1.5 kHz, fmod = 1.0 kHz, 50 Ω) Parameter Handset Baseset Unit Sensitivity at 12 dB SINAD –91 –90.8 dBm Recovered Audio 89.8 90 mVrms SINAD @ –30 dBm 42.1 44.3 dB THD @ –30 dBm 0.8 0.8 % S/N @ –30 dBm 75.7 75.1 dB AMRR @ –30 dBm 56 84.7 dB RSSI range >80 >80 dB |
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