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| 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 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 define 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 voltages). Absolute Maximum Ratings 1 Parameter +VCC IN A, IN B REF A, REF B Output Short Circuit Current Operating Temperature Storage Temperature Package Power Dissipation Control Voltage Lead Temperature Absolute Maximum +20 V -0.5V < Input < Vcc +0.5V -0.5V < Input < Vcc +0.5V 20 mA -40C to +85C -65C to +125C 150 mW 300C for 10 seconds 1. Operation of this device above any one of these parameters may cause permanent damage. Dual Linear Driver for Vector Modulators MADRCC0002 V 2.00 Electrical Specifications, TA = +25C, Reference Figure 1 (Each Circuit) Parameter Output Drive Current +VCC Supply Range IN, REF Voltage +VCC Quiescent Current Settling Time Test Conditions Vcontrol = VCC -- -- No Load 50% Ctl to 90%/10% RF Units mA V V A S Min 18 4.5 0 -- -- Typical -- 5.0 -- 50 25 Max -- 5.5 VCC 70 -- Figure 1 Specifications subject to change without notice. n North America: Tel. (800) 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. 2 Dual Linear Driver for Vector Modulators MADRCC0002 V 2.00 Figure 3A - Phase and Attenuation of SA90-0001, Vector Modulator Linearized with MADRCC0002 Linearizer (y) 90 45 bias 1 = 0.0V 0.5V 1.0V bias 2 = 5.0V 3.5V 3.0V 2.5V 2.0V 1.5V 1.0V 0.5V bias 2 = 0.0V (x) 0 1.5V 2.0V 2.5V 3.0V 3.5V bias 1 = 5.0V Figure 3B bias 1 = 0V bias 2 = +5V bias 1 = 0V bias 2 = 0V (y) 90 45 Loss = 22 dB Loss = 17 dB Loss = 12 dB (x) 0 bias 1 = +5V bias 2 = +5V bias 1 = +5V bias 2 = 0V Reflection coefficient = 0.5 2. Tic marks on x,y axes refer to reflection coefficient in increments of 0.1V. Reflection coefficients vary from -0.5 to +0.5 on both the x and y axes. 3. Data is for vector modulators driven by linearizers per attached schematic. 4. Inputs to the linearizers vary from 0 to 5V. 5. The phase with the inputs to both linearizers set to +5V is arbitrarily called zero degrees. Specifications subject to change without notice. n North America: Tel. (800) 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. 3 Dual Linear Driver for Vector Modulators MADRCC0002 V 2.00 Table 1. Inductor Selection for M/A-COM Vector Modulators Vector Modulator MAMDCC0005 MAMDCC0002 SA90-0001 Frequency Range (MHz) 925-960 (GSM) 1930-1990 (PCS) 2040-2240 (UMTS) Coil Craft P/N L1 & L2 0603CS-68NXJBC 0603CS-27NXJBC 0603CS-27NXJBC Description of L1 & L2 Inductor, 68 nH, 5% Inductor, 27 nH, 5% Inductor, 27 nH, 5% Recommended PCB Layout 6 Specifications subject to change without notice. n North America: Tel. (800) 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. 4 Dual Linear Driver for Vector Modulators Figure 2--Block Diagram Vector Modulator MADRCC0002 V 2.00 Ordering Information Part Number MADRCC0002 MADRCC0002TR MAMDCC0005-DC000 Package Bulk Packaging Tape & Reel (1K Reel) Test Board with Circuit per Figure 1 (MAMDCC0005, GSM Vector Modulator) Test Board with Circuit per Figure 1 (MAMDCC0002, PCS Vector Modulator) Test Board with Circuit per Figure 1 SA90-0001, UMTS Vector Modulator Pin Configuration Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Function NC IN B NC REF B NC REF B NC REF B OUT B NC Vcc NC NC OUT A REF A NC Pin # 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Function REF A NC REF A NC IN A NC NC NC NC NC NC GND NC NC NC NC 5 MAMDCC0002-DC000 SA90-0001-DC000 Specifications subject to change without notice. n North America: Tel. (800) 366-2266 n Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298 n Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020 Visit www.macom.com for additional data sheets and product information. |
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