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SA90-0001-DC000 Datasheet(PDF) 1 Page - M/A-COM Technology Solutions, Inc. |
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SA90-0001-DC000 Datasheet(HTML) 1 Page - M/A-COM Technology Solutions, Inc. |
1 / 8 page Dual Linear Driver for Vector Modulators Rev. V7 MADRCC0002 1 1 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: https://www.macom.com/support 1 Features Linearizes M/A-COM’s PIN Diode Vector Modulators Over a 360 Phase Range Dual Channels Allow One Driver per Vector Modulator Guaranteed Minimum Output Currents of 20 mA Operates with a Single Supply Voltage of +5V Low Quiescent Currents Single Control Voltage for Each Channel 6 x 4 mm Chip Scale Package Test Boards with Vector Modulators are Available Tape and Reel Packaging Available PQFN Package Description M/A-COM's MADRCC0002 is a dual, break point free driver that produces a logarithmic output current suitable for linearizing PIN diode based vector modulators. This driver, in conjunction with the external components, as defined in Figure 1, produces a linearized transfer function between the input control voltage of the driver and the attenuation / phase output of the vector modulator. The MADRCC0002 has been optimized for linearizing M/A-COM’s Vector Modulators (see Table 1), but will function well with most types of cathode grounded vector modulators. The driver is packaged in a 6 x 4 mm Chip Scale Package for commercial SMT applications. A typical schematic for a dual linearizer driving a vector modulator is shown in Figure 1. Ordering Information Note: Reference Application Note M513 for reel size information. Circuit Description: (Reference Figures 1, 2 and 3) Note that this is a dual driver. Only the top circuit will be described, because the bottom circuit is identical. The input divider, R1 and the sum of R2 and R3, sets the overall transfer function of the cir- cuit. To increase the transfer function, decrease the Control Voltage and the value of R1. Temperature compensation is a function of the temperature coefficient of the thermistor, R3, and the ratio of R2 to R3, and can only be optimized once the transfer function and linearity component values have been established. Varying the value of R4 will optimize the linearity of the VVA. One can achieve a more linear transfer function by driving the attenuator over a smaller portion of its dynamic range. Note that when the vector modulators called out in Table 1 are driven with the dual linearizer, both amplitude and phase are affected, which makes it hard to de- fine linearity. The individual transfer function of each voltage variable attenuator in the vector modulator (See Figure 2 for the block diagram) is linearized as a function of voltage. The two VVAs in the block diagram are the quad hybrids that are terminated by two PIN diodes. See Figure 3 for the transfer function of the SA90-0001 vector modulator (phase and attenuation vs. control volt- ages). Part Number Package MADRCC0002 Bulk Packaging MADRCC0002TR Tape & Reel (1K Reel) MAMDCC0005-DC000 Test Board with Circuit per Figure 1 (MAMDCC0005, GSM Vector Modulator) MAMDCC0002-DC000 Test Board with Circuit per Figure 1 (MAMDCC0002, PCS Vector Modulator) SA90-0001-DC000 Test Board with Circuit per Figure 1 (SA90-0001, UMTS Vector Modulator |
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