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...
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 ...