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HMC1044LP3E Fiches technique(PDF) 13 Page - Hittite Microwave Corporation |
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HMC1044LP3E Fiches technique(HTML) 13 Page - Hittite Microwave Corporation |
13 / 16 page 13 HMC1044LP3E v00.0312 PROGRAMMABLE HARMONIC LOW PASS FILTER 1 - 3 GHz 3 dB BANDWIDTH For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824 978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com Application Support: apps@hittite.com Figure 17 shows the maximum sideband rejection achieved without calibrating the modulator, both with and without the HMC1044LP3E. It is generated by selecting the HMC1044LP3E band that achieves maximum uncalibrated sideband rejection for each particular frequency accross a very wide bandwidth. The corresponding HMC1044LP3E band settings are shown in Figure 18. -60 -50 -40 -30 -20 -10 500 1000 1500 2000 2500 3000 LO FREQUENCY (MHz) With HMC1044LP3E Without HMC1044LP3E Targeted Image/Sideband Rejection Performance -5 0 5 10 15 20 500 1000 1500 2000 2500 3000 LO FREQUENCY (MHz) Figure 17. Optimal uncalibrated modulator sideband rejection with and and without HMC1044LP3E, single-ended LO configuration[3] Figure 18. HMC1044LP3E band selection corresponding to Figure 17 Results shown in Figure 17 confirm that the HMC1044LP3E improves modulator sideband rejection ~20 dB across the wideband operation of the modulator and PLL with integrated VCO. Sideband rejection performance improvements less than ~20 dB occur at those frequencies where the LO harmonics are not a dominant contributor to sideband rejection, ie. where sideband rejection performance is already good. The corresponding HMC1044LP3E band selections shown in Figure 18 are closer to those shown in Figure 14, than those from Figure 16. This confirms the data shown in Figure 12, and the postulation that the 3rd LO harmonic is a greater contributor to modulator sideband rejection degradation than the 2nd for 1xLO type modulators/demodulators. Another variable that should be considered is the insertion loss of the HMC1044LP3E which can vary ~2.5 dB across the pass band of the selected band setting as shown in Figure 1 and Figure 2. The selected HMC1044LP3E band that results in optimal sideband/image rejection performance also depends on the LO input power at the modulator/ demodulator, which is specific to each individual design. It depends on the output power of the PLL with integrated VCO (that is used as an LO) at each frequency, insertion loss of the HMC1044LP3E at the selected band setting, LO frequency, and the required modulator/demodulator LO input power. The harmonic attenuation and sideband rejection graphs in this section were generated by maintaining the minimum LO input power into the HMC697LP4E at ≥ -3 dBm across all frequencies, which falls well into the required LO input power specification in the HMC697LP4E data sheet of greater than -6 dBm and less than 6 dBm. For applications that require a flat output power response, over a wide bandwidth, it should be noted that it is possible to build a low harmonic source with flat output power over a wideband using a leveling loop based upon the HMC830LP6GE wideband PLL with integrated VCO, the HMC1044LP3E variable LPF, and the HMC993LP5E AGC. [3] Measured with HMC830LP6GE as an LO and HMC697LP4E modulator. The HMC830LP6GE was used in single-ended output configuration. |
Numéro de pièce similaire - HMC1044LP3E |
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Description similaire - HMC1044LP3E |
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