|Description||Evaluation Kit: Max2601/max2602|
|Company||Maxim Integrated Products|
|Datasheet||Download MAX2602EVKIT datasheet
The MAX2602 evaluation kit (EV kit) simplifies the evaluation of the 1W RF power transistor for 900MHz band applications. The EV kit demonstrates the (30dBm) RF power amplifier for constant-envelope applications. The EV kit is shipped with a MAX2602, which contains an internal biasing diode. With a simple modification, the MAX2602 EV kit can be used to emulate the MAX2601, which does not have an internal biasing diode.1W (30dBm) Output Power o 50 Inputs and Outputs to +5.5V Supply Range o 11dB Gain at 836MHz
PART MAX2602EVKIT-SO TEMP. RANGE to +85°C BOARD TYPE Surface Mount
DESIGNATION QTY R2 R3 IN, OUT U1 None DESCRIPTION 2pF surface-mount capacitors 10pF surface-mount capacitor 12pF surface-mount capacitor 1000pF surface-mount capacitors 0.1µF surface-mount capacitors 100nH surface-mount inductor 18.5nH surface-mount spring inductor Coilcraft A05T (Note 1) 430 surface-mount resistor 24 surface-mount resistor 0 resistor Edge-mount SMA connectors MAX2602ESA (8-pin, thermally enhanced SO) MAX2601/MAX2602 data sheet Printed circuit board
The following section provides instructions for setting up the MAX2602 EV kit 1W RF power amplifier.
RF signal generator capable of at least 20dBm of output power at 836MHz Attenuator that can handle at least of RF power (used to protect the test equipment) RF spectrum analyzer for use at 836MHz (alternatively, a power meter can be used) DC power supply capable of delivering to +5.5V
Follow these steps for connecting the EV kit: 1) Connect 50 RF signal generator capable of supplying at least 836MHz to the RF input SMA connector ("IN"). Set the generator's initial output to a much lower power (-10dBm, for instance). Keep this generator's RF output off at this time. 2) Connect a fixed attenuator that can handle 1W of power to the output SMA connector ("OUT"). This attenuator reduces the power to the test equipment and protects it from overload. Connect this attenuator's output to a spectrum analyzer that is set to display 836MHz. It may be possible to set a referencelevel offset on the analyzer to compensate for the attenuator. Consult your spectrum analyzer's manual for details. 3) Set the power supply to +3.6V with a 1A current limit. Disable the output. Connect the power supply to the VC terminal on the EV kit through an ammeter.
Note 1: Contact Coilcraft by phone 322-2645, by fax or on the World Wide Web at http://www.coilcraft.com.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
4) Connect the same power supply through a separate lead to the EV kit's VB terminal. 5) Verify that all the connections are correct to avoid damaging the transistor or your test equipment. 6) Turn on the 3.6V supply. Note the supply current with the RF generator off. It should be around 100mA. 7) Activate the RF signal generator and slowly increase the generator's output power 20dBm. At this time, the supply current should be about 500mA, and the output power should be 30dBm. emitter inductance as low as possible, as excessive emitter inductance can degrade the performance of any RF common-emitter amplifier. The bottom-side contact is also the principal path for heat dissipation, and must be connected to a large ground plane.
Capacitors C5, C9, and C11 provide decoupling for the bias supply. The transistor's bias current is set by the internal biasing diode's current. This current is set by the following equation: 0.75V R1
Figure 1 is the schematic for the MAX2602 EV kit as shipped. The circuit consists of four blocks: power-supply decoupling, a bias network, and both input and output matching networks. The amplifier built on this board is biased for class AB operation 1W of output power, and provides high efficiency.
The collector current is scaled to the bias current: R3 is used as a jumper. The transistor's base is biased through R2 and L1 (a choke). For more information on the internal biasing diode's operation, refer to the MAX2601/MAX2602 data sheet. The transistor's RF input does not present a 50 impedance, so a matching network is required for proper operation a 50 environment. This network consists of capacitor C1 to ground, approximately 1 inch (or 2.5cm) of the 50 transmission line (T1), a DCblocking capacitor (C6), and a shunt capacitor at the transistor base (C4).
Capacitors C8 and C10 provide decoupling for VC. The collector has two separate pins: one for the VC input (connected through choke L2), and one for the RF output. The most important contact for the MAX2602 is not on the top of the board; it is the bottom-side emitter contact that is connected to ground. This contact keeps
The RF output is taken from pin 8 and is not at 50 impedance, so a matching network is required. The matching network consists of a shunt capacitor at the collector (C3), a DC-blocking capacitor a 50 transmission line (T2), and a shunt capacitor (C2).
this mode, be sure to turn the VC supply on before the VB supply. When turning the part off, turn the VB supply off first and then the VC supply. External bias voltages ranging from to 0.85V are typically used.
For best results, use the MAX2602 EV kit as a layout guide. The most critical connection is the emitterground contact on the MAX2602's bottom side. On the EV kit, this contact is made through a large (0.1 inch, 2.5mm diameter) plated through-hole in the board, located directly under the part. This contact must be soldered directly to a large ground plane, it is the principal path for heat dissipation, as well as the lowinductance emitter ground. The MAX2602 EV kit uses its ground plane as the heatsink.
To evaluate the MAX2602 without the biasing diode (functionally equivalent to the MAX2601), the 0 resistor (R3) must be removed, and the 430 resistor (R1) must be replaced a 0 resistor (a short) (Figure 2). Now an external bias voltage may be connected to the EV kit's VB input. The biasing diode is no longer connected, so the EV kit will not work without an external biasing voltage. To avoid damage to the MAX2602 in
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