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LT5527EUF-TRPBF Datasheet(PDF) 9 Page - Linear Technology |
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LT5527EUF-TRPBF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  LT5527 9 5527fa APPLICATIONS INFORMATION Introduction The LT5527 consists of a high linearity double-balanced mixer, RF buffer amplifier, high speed limiting LO buffer amplifier and bias/enable circuits. The RF and LO inputs are both single ended. The IF output is differential. Low side or high side LO injection can be used. Two evaluation circuits are available. The standard evalua- tion circuit, shown in Figure 1, incorporates transformer- based IF matching and is intended for applications that require the lowest LO-IF leakage levels and the widest IF bandwidth. The second evaluation circuit, shown in Figure 2, replaces the IF transformer with a discrete IF balun for reduced solution cost and size. The discrete IF balun delivers comparable noise figure and linearity, higher conversion gain, but degraded LO-IF leakage and reduced IF bandwidth. RF Input Port The mixer’s RF input, shown in Figure 3, consists of an integrated transformer and a high linearity differential amplifier. The primary terminals of the transformer are connected to the RF input pin (Pin 3) and ground. The secondary side of the transformer is internally connected to the amplifier’s differential inputs. One terminal of the transformer’s primary is internally grounded. If the RF source has DC voltage present, then a coupling capacitor must be used in series with the RF input pin. The RF input is internally matched from 1.7GHz to 3GHz, requiring no external components over this frequency range. The input return loss, shown in Figure 4a, is typi- cally 10dB at the band edges. The input match at the lower band edge can be optimized with a series 2.7pF capacitor at Pin 3, which improves the 1.7GHz return loss to greater than 20dB. Likewise, the 2.7GHz match can be improved to greater than 30dB with a series 1.5nH inductor. A series 1.5nH/2.7pF network will simultaneously optimize the lower and upper band edges and expand the RF input bandwidth to 1.1GHz-3.3GHz. Measured RF input return losses for these three cases are also plotted in Figure 4a. Alternatively, the input match can be shifted down, as low as 400MHz or up to 3700MHz, by adding a shunt capacitor (C5) to the RF input. A 450MHz input match is realized with C5 = 12pF, located 4.5mm away from Pin 3 on the evaluation board’s 50Ω input transmission line. A 900MHz input match requires C5 = 3.9pF, located at 1.3mm. A 3500MHz input match is realized with C5 = 0.5pF, located at 4.5mm. This Figure 3. RF Input Schematic Figure 4. RF Input Return Loss With and Without External Matching (4b) Series Shunt Matching (4a) Series Reactance Matching RFIN ZO = 50Ω L = L (mm) C5 RF 5527 F03 EXTERNAL MATCHING FOR LOW BAND OR HIGH BAND ONLY TO MIXER 3 FREQUENCY (GHz) 0.2 –30 –25 –20 –15 –10 1.2 2.2 3.2 4.2 5527 F04a –5 0 0.7 1.7 2.7 3.7 SERIES 1.5nH SERIES 2.7pF NO EXTERNAL MATCHING SERIES 1.5nH SERIES 2.7pF RF FREQUENCY (GHz) 0.2 –30 –25 –20 –15 –10 1.2 2.2 3.2 4.2 5527 F04b –5 0 0.7 1.7 2.7 3.7 NO EXTERNAL MATCHING 900MHz C5 = 3.9pF L = 1.3mm 450MHz C5 = 12pF L = 4.5mm 3.5GHz C5 = 0.5pF L = 4.5mm |
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