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MAMDCC0002

Tyco
Part Number MAMDCC0002
Manufacturer Tyco
Description Dual Linear Driver
Published Jul 26, 2007
Detailed Description Dual Linear Driver for Vector Modulators V 2.00 MADRCC0002 Features n n n n n n n n n CSP-9 Linearizes M/A-COM’s PI...
Datasheet PDF File MAMDCC0002 PDF File

MAMDCC0002
MAMDCC0002

Overview
Dual Linear Driver for Vector Modulators V 2.
00 MADRCC0002 Features n n n n n n n n n CSP-9 Linearizes M/A-COM’s PIN Diode Vector Modulators Over a 360° Phase Range Dual Channels Allow One Driver per Vector Modulator Output Currents up to 12 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 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.
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 circuit.
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 th...


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