EV9980

EV9980 CML Microcircuits Evaluation Kit User Manual COMMUNICATION SEMICONDUCTORS UM9980/8 November 2009 Features Allows full evaluation and investigation of the Support and interfacing for CMX998 Cartesian Feedback Transmitter IC customer PAs Operational range: 100MHz to 1GHz Interfaces to CMX981 EvKit Access to RF, control and baseband signals Differential or single-ended I and Q via connectors and test points inputs Complete demonstration of Cartesian Can utilise PE0002 EvKit interface Feedback Loop functionality: default is to work with a PC or can be used 450MHz and configurable for 800MHz with custom interface equipment 1 Brief Description The EV9980 EvKit allows rapid and full evaluation of the CMX998 Cartesian Feedback Transmitter IC. In the form of a populated PCB, this flexible platform enables users, using a control interface, to configure and evaluate the CMX998 to various applications and frequency bands. Access is provided to all CMX998 RF, baseband and control signals by either connector or test points. Test access points are available to accept common test equipments such as RF and baseband signal generators and spectrum analysers. All signal paths are matched by suitable components and the EvKit provides a power amplifier (PA) device at 450MHz which can be modified to provide operation at 800MHz. The EvKit can also be configured for an external PA. The overall operating evaluation frequency range of the EvKit is for RF frequencies between 100MHz and 1GHz. The EV9980 can be configured to work with the CMX981 Digital Radio Baseband processor IC, standard test equipment or with a custom baseband system. No software is required for use of the EvKit; the on-board CMX998 is controlled via its C-BUS serial interface and control system. This can be controlled by a PE0002 interface card (available separately) or, alternatively, a custom C-BUS interface and control system can be used. 2009 CML Microsystems Plc Evaluation Kit for CMX998 EV9980 CONTENTS Section Page 1 Brief Description .....................................................................................1 1.1 History..........................................................................................4 2 Preliminary Information.......................................................................... 6 2.1 Laboratory Equipment..................................................................6 2.1.1 Power Supply..................................................................6 2.2 Handling Precautions...................................................................6 2.2.1 Static Protection..............................................................6 2.2.2 Contents - Unpacking ..................................................... 6 2.3 Approvals .....................................................................................7 3 Quick Start...............................................................................................8 3.1 Make External Connections and Apply Power ............................ 8 3.2 Configure and Trim ...................................................................... 9 3.3 Operate ......................................................................................10 4 Signal Lists............................................................................................11 5 Circuit Schematics and Board Layouts..............................................15 6 Detailed Description .............................................................................17 6.1 Hardware Description ................................................................17 6.1.1 Cartesian Feedback Loop (CFBL)................................17 6.1.2 Power Amplifiers ...........................................................17 6.1.3 Local Oscillator (LO) .....................................................18 6.1.4 I/Q Baseband Inputs .....................................................18 6.1.5 CMX981 Interface.........................................................18 6.1.6 Manual DC Nulling........................................................18 6.1.7 Power Supply................................................................18 6.2 Adjustments and Controls..........................................................18 6.2.1 800MHz Operation using the RF2173 ..........................19 6.2.2 850MHz Operation using RF5110G .............................19 6.2.3 Improved Wideband Noise in 450MHz Operation ........ 21 6.2.4 Using an External Power Amplifier ...............................21 6.3 Software Description..................................................................22 6.3.1 The CMX998 Regs ($01-$06) Tab ...............................22 6.3.2 The CMX998 Regs ($07-$08, $F2-$F8) Tab................ 23 6.3.3 The Script Handler Tab.................................................24 6.4 Application Information ..............................................................25 6.4.1 Error Configuration........................................................25 6.4.2 Typical Performance of Closed Loop Configuration..... 25 6.4.3 450MHz TETRA Operation and Wideband Noise ........ 33 6.4.4 Testing the CMX998 with the CMX981.........................34 6.5 Troubleshooting .........................................................................39 6.5.1 Closed Loop Operation.................................................39 6.5.2 Open Loop Operation ...................................................39 7 Performance Specification...................................................................40 7.1 Electrical Performance...............................................................40 7.1.1 Absolute Maximum Ratings ..........................................40 7.1.2 Operating Limits............................................................40 7.1.3 Operating Characteristics .............................................41 2009 CML Microsystems Plc 2 UM9980/8