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AD734SCHIPS Datasheet(PDF) 10 Page - Analog Devices |
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AD734SCHIPS Datasheet(HTML) 10 Page - Analog Devices |
10 / 12 page AD734 –10– REV. C SQUARE WAVE SINE WAVE TRI-WAVE 10k 100k 1M 10M INPUT FREQUENCY – Hz 100 10 1 100m 10m 1m 100 Figure 16. RMS-DC Converter Performance LOW DISTORTION MIXER The AD734’s low noise and distortion make it especially suitable for use as a mixer, modulator, or demodulator. Although the AD734’s –3 dB bandwidth is typically 10 MHz and is established by the output amplifier, the bandwidth of its X and Y interfaces and the multiplier core are typically in excess of 40 MHz. Thus, provided that the desired output signal is less than 10 MHz, as would typically be the case in demodulation, the AD734 can be used with both its X and Y input signals as high as 40 MHz. One test of mixer performance is to linearly combine two closely spaced, equal-amplitude sinusoidal signals and then mix them with a third signal to determine the mixer’s 2-tone Third-Order Intermodulation Products. 1 2 3 4 5 6 7 10 8 9 11 13 12 14 W ER VN VP DD Z1 Z2 X1 X2 U1 U2 U0 Y1 Y2 AD734 0.1 F 0.1 F +15V –15V 2k HP3326A COMBINE A + B DATEL DVC-8500 HP3326A HIGH VOLTAGE OPTION HP3585A WITH 10X PROBE dBm REF TO 50 AD707 Figure 17. AD734 Mixer Test Circuit Figure 17 shows a test circuit for measuring the AD734’s perfor- mance in this regard. In this test, two signals, at 10.05 MHz and 9.95 MHz are summed and applied to the AD734’s X interface. A second 9 MHz signal is applied to the AD734’s Y interface. The voltage at the U interface is set to 2 V to use the full dynamic range of the AD734. That is, by connecting the W and Z1 pins together, grounding the Y2 and X2 pins, and setting U = 2 V, the overall transfer function is W = X 1Y1 2 V (14) and W can be as high as 20 V p-p when X1 = 2 V p-p and Y1 = 10 V p-p. The 2 V p-p signal level corresponds to +10 dBm into a 50 Ω input termination resistor connected from X1 or Y1 to ground. If the two X1 inputs are at frequencies f1 and f2 and the frequency at the Y1 input is f0, then the two-tone third-order intermodulation products should appear at frequencies 2f1 – f2 ± f0 and 2f2 – f1 ± f 0. Figures 18 and 19 show the output spectra of the AD734 with f1 = 9.95 MHz, f2 = 10.05 MHz, and f0 = 9.00 MHz for a signal level of f1 & f2 of 6 dBm and f0 of +24 dBm in Figure 18 and f1 & f2 of 0 dBm and f0 of +24 dBm in Figure 19. This performance is without external trimming of the AD734’s X and Y input-offset voltages. The possible Two Tone Intermodulation Products are at 2 × 9.95 MHz – 10.05 MHz ± 9.00 MHz and 2 × 10.05 – 9.95 MHz ± 9.00 MHz; of these only the third-order products at 0.850 MHz and 1.150 MHz are within the 10 MHz band- width of the AD734; the desired output signals are at 0.950 MHz and 1.050 MHz. Note that the difference (Figure 18) between the desired outputs and third-order products is approximately 78 dB, which corresponds to a computed third-order intercept point of +46 dBm. Figure 18. AD734 Third-Order Intermodulation Performance for f1 = 9.95 MHz, f2 = 10.05 MHz, and f0 = 9.00 MHz and for Signal Levels of f1 & f2 of 6 dBm and f0 of +24 dBm. All Dis- played Signal Levels Are Attenuated 20 dB by the 10X Probe Used to Measure the Mixer’s Output Figure 19. AD734 Third-Order Intermodulation Performance for f1 = 9.95 MHz, f2 = 10.05 MHz, and f0 = 9.00 MHz and for Signal Levels of f1 & f2 of 0 dBm and f0 of +24 dBm. All Dis- played Signal Levels Are Attenuated 20 dB by the 10X Probe Used to Measure the Mixer’s Output |
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