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AD8362 Datasheet(PDF) 16 Page - Analog Devices |
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AD8362 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 33 page  AD8362 Data Sheet Rev. F | Page 16 of 33 CHARACTERIZATION SETUP EQUIPMENT The general hardware configuration used for most of the AD8362 characterization is shown in Figure 40. The signal source is a Rohde & Schwarz SMIQ03B. A 1:4 balun transformer is used to transform the single-ended RF signal to differential form. For frequencies above 3.0 GHz, an Agilent 8521A signal source was used. For the response measurements in Figure 32 and Figure 33, the configuration shown in Figure 41 is used. For Figure 34 and Figure 35, the configuration shown in Figure 42 is used. For Figure 36, the configuration shown in Figure 43 is used. AD8362 CHARACTERIZATION BOARD RFIN 3dB VOUT SMIQ03B RF SOURCE PC CONTROLLER MULTIMETER HP34401A Figure 40. Primary Characterization Setup ANALYSIS The slope and intercept are derived using the coefficients of a linear regression performed on data collected in its central operating range. Error is stated in two forms: error from the linear response to the CW waveform and output delta from 25°C performance. The error from linear response to the CW waveform is the decibel difference in output from the ideal output defined by the conversion gain and output reference. This is a measure of the linearity of the device response to both CW and modulated waveforms. The error in dB is calculated by Slope P P Slope VOUT Error Z IN dB (1) where PZ is the x intercept, expressed in dBm. Error from the linear response to the CW waveform is not a measure of absolute accuracy because it is calculated using the slope and intercept of each device. However, it verifies the linearity and the effect of modulation on the device response. Error from the 25°C performance uses the performance of a given device and waveform type as the reference; it is predomi- nantly a measurement of output variation with temperature. C1 C2 C3 C4 BALUN 3dB COMM CHPF DECL INHI INLO DECL PWDN COMM ACOM VREF VTGT VPOS VOUT VSET ACOM CLPF AD8362 RF 50Ω HPE3631A POWER SUPPLY SMT03 SIGNAL GENERATOR TEK P5050 VOLTAGE PROBE TEK TDS5104 SCOPE Figure 41. Response Measurement Setup for Modulated Pulse C1 C2 C3 C4 BALUN 3dB COMM CHPF DECL INHI INLO DECL PWDN COMM ACOM VREF VTGT VPOS VOUT VSET ACOM CLPF AD8362 RF 50Ω TEK TDS5104 SCOPE TEK P5050 VOLTAGE PROBE HP8112A PULSE GENERATOR SMT03 SIGNAL GENERATOR HPE3631A POWER SUPPLY Figure 42. Response Measurement Setup for Power-Down Step TEK P5050 VOLTAGE PROBE C1 C2 C3 C4 BALUN 3dB COMM CHPF DECL INHI INLO DECL PWDN COMM ACOM VREF VTGT VPOS VOUT VSET ACOM CLPF AD8362 RF 50Ω 732Ω 0.01µF 100pF 50Ω AD811 TEK TDS5104 SCOPE HP8112A PULSE GENERATOR SMT03 SIGNAL GENERATOR Figure 43. Response Measurement Setup for Gated Supply |
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