RF Interface Reference

Transcription

1 5 RF Interface Reference In This Chapter: RF Interface Details, 32 RF and IF Interfaces, 33 Pulse Width Modulation, 35 Power, Ground and Clock, 36 Bypassing the Analog Chain, 37 Receive Section Modifications, 38 Transmit Section Modifications, 39 Mechanical Interface, 40 This chapter provides technical details of the RF interface for customers who want to connect their own radio device to the WiNetPRO V1.1 Evaluation Kit. Note: If you are going to connect your own radio device, you must perform the modifications described in 5.3 Bypassing the Analog Chain on page 37. Rev 2 Proprietary 31

2 Ch. 5 RF Interface Reference RF Interface Details 5.1 WiNetPRO V1.1 RF Interface Details This section provides pinout details of the WiNetPRO Evaluation Kit for customers who will use their own RF device. A customer s RF device can be external to the Evaluation Kit and interface through cables, or it can be a daughter card that plugs into J34 and on the Carnix board. Note: No filtering or amplification of the RF signals occurs at the Carnix board in the Evaluation Kit. Your RF device must provide those functions. Figure 5-1 Carnix Board RF Connector Locations J102 J109 J101 J100 1 J34 2 Pin Detail (top view) J Proprietary Rev 2

3 WiNetPRO V1.1 Ch. 5 RF Interface Reference RF Interface Details RF and IF Interfaces For customers who supply their own RF device, there are two options by which to connect the device to the Evaluation Kit: by connecting to the IF transmit and receive ports at J100 and J101 on the Carnix board, or; by connecting to J34 and pin connectors, or J102 J109 MCX connectors, on the Carnix board. The first option is applicable for IF mode operation only; the second option is applicable to both IF and IQ modes. Note: Be sure to perform the steps in 5.3 Bypassing the Analog Chain on page 37 before connecting your radio IF Transmit and Receive Applicable for operation in IF mode only. Figure 5-2 IF Receive and Transmit Connectors Customer RF Device RX TX RX TX J100 J101 Evaluation Kit Carnix Board Table 5-1 IF Receive and Transmit Connectors Mode Conn. Impedance Frequency Range Power Range Comment RX J Ohm 2 to 7 MHz 45 to 14.5 dbm A receive power level of 30 dbm is recommended to produce an optimal SNR. TX J Ohm 2 to 7 MHz 14.5 ± 0.5 dbm (nominal) This frequency is derived by sampling at 25 MHz. Maximum frequency cannot be more than (25/2) 12.5 MHz. Rev 2 Proprietary 33

4 Ch. 5 RF Interface Reference RF Interface Details WiNetPRO V RF Reference Signals Applicable for operation in IF mode or IQ mode. All signals available from the pins in J34 and, or from MCX connectors J102 J109 on the Carnix board. Table 5-2 IF Mode Operation MCX Conn. Conn. J34 Pin # Signal Description TX (DAC output) J106 2 I_OUT_DSI J106 J I_OUT_DSI I_OUT_DSI# Single Mode FS = 1 dbm (1) Nominal power 18.5 ±0.5 dbm Differential Mode Should be ~3 db higher than single mode RX (ADC input) J102 J AIN_I AIN_I# Differential Mode FS = 10 dbm Nominal pwr = 2 dbm (1) FS (full scale) is defined with a sinusoid. Table 5-3 IQ Mode Operation MCX Conn. Conn. J34 Pin # Signal Description J106 J I_OUT_DSI I_OUT_DSQ Single Mode TX J106 J108 J107 J I_OUT_DSI I_OUT_DSI# I_OUT_DSQ I_OUT_DSQ# Differential Mode RX J102 J105 J103 J AIN_I AIN_I# AIN_Q AIN_Q# Differential Mode 34 Proprietary Rev 2

5 WiNetPRO V1.1 Ch. 5 RF Interface Reference RF Interface Details RF Control Signals The FPGA sends control signals to the RF device for instantaneous or burst synchronized configuration. There are twelve pins on used for the control functions. Table 5-4 RF Control Signals Pin # Signal Pin # Signal 21 RF 0 30 RF 6 23 RF 1 32 RF 7 24 RF 2 33 RF 8 26 RF 3 35 RF 9 27 RF 4 36 RF RF 5 38 RF Pulse Width Modulation A pulse width modulation signal is provided for use as a reference signal from any of three pins in the J34 and connectors on the Carnix board: PWM 1 pin 15 PWM 2 pin 16 PWM 3 J34 pin 12 The analog output from these pins is generated by a low pass filter (LPF). Figure 5-3 Pulse Width Modulation Signal Vmax (3v3) Primary V max T LPF 0 T 1 T T 1 T to T 1 Time V T V [ 0 to V max ] V max 3v3 Rev 2 Proprietary 35

6 Ch. 5 RF Interface Reference Power, Ground and Clock WiNetPRO V Power, Ground and Clock Power, ground, and clock reference signals are in the connector on the Carnix board. Table 5-5 Power, Ground and Clock Pin # Signal Maximum Current 1, 2, 3, 4 5V_ANA 4A 5, 6, 7, 8 5V_ANA 1A 9, 10 12V_DN 4A 11, 12, 13, 14 GND_ANA 20 CLK_RF 17, 18, 19, 22, 25, 28, 31, 34, 37, 39, 40 Digital Ground NOTE: The current limits shown in the table above are the maximums allowable on each voltage source. However, the combined power from the three sources cannot exceed 53 watts. 36 Proprietary Rev 2

7 WiNetPRO V1.1 Ch. 5 RF Interface Reference Bypassing the Analog Chain 5.3 Bypassing the Analog Chain If you are going to connect your own radio device to the Evaluation Kit, you must bypass the existing transmit and receive analog chains on the Carnix board. This is accomplished by changing resistors as described in this section. Rev 2 Proprietary 37

8 Ch. 5 RF Interface Reference Bypassing the Analog Chain WiNetPRO V Receive Section Modifications Using Figure 5-4 as a reference, perform these modifications: Remove R544 and R547 (0 ohm resistors). Add the previously disconnected 0 ohm resistors at R545 and R549. In this configuration, the receive signal must connect to the Carnix board at: IF mode J102 and J103 (differential mode only) IQ mode J102 and J103 for I and J104 and J105 for Q (differential mode only) See Figure 5-1 on page 32 for connector locations. See Table 5-2 on page 34 and Table 5-3 on page 34 for pinout information. ADC input impedance is approximately 3K ohm. So when a signal is introduced into J102, J103, J104 and J105 you may need to add an extra load resistor to your signal generator. Figure 5-4 Receive Section Schematic R544 R545 R547 R Proprietary Rev 2

9 WiNetPRO V1.1 Ch. 5 RF Interface Reference Bypassing the Analog Chain Transmit Section Modifications Using Figure 5-5 as a reference, perform this modification: Remove R695 to avoid possible impedance mismatch introduced by U513 (current feedback amp-op). Note that R664, R647, R502 and R646 are used to transform current from the DAC in voltage and must be left in place. Figure 5-5 Transmit Signal Schematic I_TRANSMIT R665 U513 I_TRANSMIT# Q_TRANSMIT Q_TRANSMIT# Rev 2 Proprietary 39

10 Ch. 5 RF Interface Reference Mechanical Interface WiNetPRO V Mechanical Interface An RF daughter card can be plugged into J34 and on the Carnix board. Both connectors have the part number UG from the 3M Corporation. 3M offers different types of mating connectors, both board-to-board and board-to-wire. You can go to their web site and search on the part number to access data sheets and mating charts. Figure 5-6 J34 and Location Dimensions PHY Board J All dimensions mm 40 Proprietary Rev 2