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NP2T Datasheet(PDF) 3 Page - Mitel Networks Corporation |
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NP2T Datasheet(HTML) 3 Page - Mitel Networks Corporation |
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3 / 20 page  3 Preliminary Information SL1925 Quick Reference Data Characteristic Units Operating range 950-2150 MHz Input noise figure, DSB, maximum gain, 1500MHz 19 dB Maximum conversion gain (assuming 6dB filter loss) >55 dB Minimum conversion gain (assuming 6dB filter loss) <20 dB IP32T input referred 113 dBuV Converter input referred IM3, two tones at 97dB µV 30 dBc IP22T input referred 140 dBuV P1dB input referred 103 dBuV Baseband amplifier Output limit voltage 2.0 V Gain match up to 22 MHz 0.2 dB Phase match up to 22 MHz 0.7 deg Gain flatness up to 22 MHz 0.5 dB Local oscillator phase noise across entire 950MHz to 2150MHz band: SSB @ 10 kHz offset 80 dBc/Hz Table 1 The required 950MHz to 2150MHz I and Q reference LO frequencies for quadrature direct conversion are generated by the on board oscillators named ‘vcos’ and ‘vcov’, and the phase splitter. Oscillator ‘vcos’ operates nominally from 1900MHz to 3000MHz and is then divided by two to provide 950MHz to 1500MHz. Oscillator ‘vcov’ operates nominally from 1400MHz to 2150MHz. Only one oscillator is active at any time and selection is made within the phase splitter under the control of the LOsel input. Each oscillator uses an external varactor tuned resonant network optimised for low phase noise with a single varactor line control. A recommended application circuit for the oscillators is shown in Figure 4. The LO from the phase splitter drives a buffer whose outputs ‘PSout’ and ‘PSoutb’ can be used for driving an external PLL control loop for the VCO’s. The typical LO phase noise is shown in Figure 11. The mixer outputs are coupled to baseband buffer outputs ‘OPFI’ and ‘OPFQ’ which drive external band limit filters. The output impedance of these buffers is contained in Figure 12. The outputs of the filters are then connected to the inputs ‘IPFI’ and ‘IPFQ’ of the baseband channel amplifiers. The outputs ‘Iout’ and ‘Qout’ provide for a low impedance drive and can be used with a maximum load as in Figure 3. The output impedance of this section is contained in Figure 13. An example filter for application with 30MS/s systems is contained in Figure 14. All port peripheral circuitry for the SL1925 is shown in Figure 15a and 15b. The typical key performance data at 5V Vcc and 25 °C ambient are shown in the ‘QUICK REFERENCE DATA’ of Table 1. Functional Description The SL1925 is a wideband direct conversion quadrature downconverter optimised for application in satellite receiver systems. A block diagram is given in Figure 2 and shows the device to include a broadband RF preamplifier with AGC control, two oscillator sustaining amplifiers, a frequency agile 90° phase splitter, I Q channel mixers and I Q channel baseband amplifiers. The only additional elements required are an external tank circuit for each oscillator, and baseband interstage filters. To fabricate a complete tuner an RF AGC stage offering +20dB to -10 dB of gain range and a 2.2 GHz PLL frequency synthesiser are also required. An example application is shown in Figure 16. In normal application the first satellite IF frequency of typically 950 to 2150 MHz is fed via the tuner RF AGC stage to the RF preamplifier, which is optimised for impedance match and signal handling. The RF preamplifier is designed such that no tracking RF filter is required and also allows for analog interferers at up to 10 dB higher amplitude. The converter RF input impedance is shown in Figure 5. The amplifier signal is then fed to an AGC stage providing a minimum of 35dB AGC control, which together with the RF attenuator provides a possible overall tuner dynamic range of 65dB, to allow for normal operating dynamic range and MCPC systems. The signal is then split into two balanced channels to drive the I and Q mixers. The AGC characteristic, and gain variation of IIP3, IIP2, P1dB and NF are contained in Figs. 6, 7, 8, 9 and 10 respectively. |
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Similar Description - NP2T |
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