DEMO MANUAL DC1437B LTM9003 Digital Predistortion Receiver Subsystem Description Demonstration circuit 1437B is an evaluation board fea- sition demo board and the output can be easily analyzed turing Linear Technology Corporations LTM 9003 12-Bit with Linear Technologys PScope data processing Predistortion Receiver Subsystem. DC1437 demonstrates software, which is available for no charge on our website good circuit layout techniques and recommended external at DEMO MANUAL DC1437B Quick s p D Validating the performance of the LTM9003 is simple provide the supply voltage for the DC1437. Note that with DC1437, and requires only two input sources, a the LTM9003-AA requires a 3.3V supply voltage for clock source, a computer, and a lab power supply. Note the mixer, whereas the LTM9003-AB requires 5V. As the RF and LO inputs are matched for 1.4GHz to 2.2GHz, such, only the DC1437B-AB board requires 5V as well and 0.9GHz to 3GHz, respectively. Refer to the schematic as 3.3V input the DC1437B-AA board can be powered in Figure 4 for other matching configurations to accom- from 3.3V only. The entire board and all components modate other frequency ranges. Refer to Figure 1 for share a common ground. The power supply should still proper board evaluation equipment setup and follow the be a low noise lab power supply capable of supplying procedure below: at least 1A. 1. Plug the DC1437B to the DC890 USB High Speed Data 6. Provide an encode clock to the ADC via SMA connec- Collection Board using edge connector P1. tor J7. Use a low-phase-noise clock source such as a filtered RF signal generator or a high quality clock 2. Connect the DC890 to a host PC with a standard USB oscillator. Note that, similar to having a noisy input, a A/B cable. Note the DC890B will also require an exter- high jitter (high phase noise) encode clock will degrade nal 6V, 1A power supply when receiving LVDS format the signal-to-noise ratio (SNR) of the system. signals. 7. Apply an RF input signal to the board. For best results, 3. Run the PScope software (PScope.exe version K76 or use a low distortion, low noise signal generator with later) which can be downloaded from www.linear.com/ sufficient filtering to avoid degrading the performance designtools/software. Complete software documenta- of the receiver. tion is available from the Help menu. Updates can be downloaded from the Tools menu. Check for updates 8. Apply an LO input signal to the board. Note that the periodically as new features may be added. difference in frequency between this signal and the RF signal will be the IF frequency resulting at the IF filter 4. The PScope software should recognize the DC1437B and ADC input. and configure itself automatically. See Figure 3 for the default configuration settings. 9. Click the Collect button (see Figure 2) to begin acquiring data. The Collect button then should change to Pause. 5. Connect the power supply as shown in Figure 1. To stop data acquisition, click the Pause button. There are onboard low noise voltage regulators that Table 1. DC1437B Assembly Options ASSEMBLY VERSION U2 PART NUMBER MAX CONVERSION RATE NUMBER OF BITS MIXER SUPPLY VOLTAGE RF FREQUENCY RANGE DC1437B-AA LTM9003-AA 250Msps 12 3.3V 400MHz TO 3800MHz DC1437B-AB LTM9003-AB 250Msps 12 5V 400MHz TO 3700MHz dc1437bf 2 ure roce tart