Changes between Version 7 and Version 8 of Internal/NoiseGenerator/Hardware/WiBo
- Timestamp:
- Jan 14, 2007, 3:55:43 AM (18 years ago)
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Internal/NoiseGenerator/Hardware/WiBo
v7 v8 1 1 = Orbit Noise Generator Wireless Board (!WiBo) = 2 2 3 [[TOC(depth=3)]] 4 3 5 !WiBo is a RF front-end board for Orbit Noise Generator designed around a Maxim, Inc. MAX2829ETN+D radio transceiver chip. Schematic is [attachment:WiBi-103-Schematics.pdf attached]. It is manufactured as a 4.00 x 4.00” printed circuit board (PCB). 6 7 == Hardware Components == 4 8 5 9 === MAX2829ETN+D Transciever (U1) === … … 16 20 === RF Control Register (U2) === 17 21 18 [attachment:MM74HC595.pdf 74HC595] is an 8bit serial in parallel out shift register used to provide control signals for various RF functions. Register programming signals :22 [attachment:MM74HC595.pdf 74HC595] is an 8bit serial in parallel out shift register used to provide control signals for various RF functions. Register programming signals (U2 shares serial clock - RADIO_IO 3 and data line - RADIO_IO 4 with MAX2829): 19 23 20 24 ||!BiBo function||WiBo102 function||74HC595 function|| … … 24 28 25 29 This register controls five functions, namely, turn on/off of the 2GHz and 5GHz power amps, MAX2829 transmit and receive control signals and the MAX2829 shutdown. The register bit assignment is given in the following table: 30 31 NOTE: 0 is the first bit in, so shift in reverse order 26 32 27 33 ||01234567||Function|| … … 36 42 ||xxxxxxxx1||SPARE 4 output on (9th bit)|| 37 43 38 U2 shares serial clock and data lines (RADIO_IO 3 and RADIO_IO 4) with MAX2829. 39 40 Note: 0 is the first bit in, so shift in reverse order 44 Assuming the MAX2829 has already been programmed, to enable a TX RF output the user must program a 11001xxx into U2. 45 46 NOTE: Do not turn on both the 2GHz and the 5GHz power amps at the same time! 47 NOTE: Do not turn on both the RXENA and TXENA lines (not sure why?). 48 41 49 42 50 === LT1994 Baseband Amplifiers (U3xx, U4xx) === … … 82 90 At 5.6GHz the frequency control will be approx. +-100kHz or 780 Hz/step. 83 91 84 === Antennasa (A01-A04) === 92 === Antennas (A01-A04) === 93 85 94 Four antennas (A01-A04) are mounted directly to WiBo102 though provision is made for adding SMA connectors and using off-board antennas if necessary. Two antennas are primarily for transmission (Tx) and two for receiving (Rx). Antenna switching is possible for diversity gain. It is also possible to switch all Tx and Rx signals into a single antenna. 86 95 … … 90 99 For orientation purposes, reference marks are shown along the top (A-D) and right sides (1-4) of the board in one inch increments. 91 100 92 [[Image(WiBo103-Photo.jpg) !WiBo PCB]] 101 [[Image(WiBo103-Photo.jpg)]] 102 93 103 Looking from the top down, the top copper layer is the component side with all the high-frequency RF transmission lines. The dielectric under this layer is 20 mils thick. The structure of the traces is coplanar waveguide with ground (CPWG). 94 104 A trace width of 30 mils and gap-to-ground of 18 mils provides a very close match to a 50ohm characteristic impedance. … … 100 110 RADIO_IO_1/3/4 download programming coefficients to the MAX2829. 101 111 102 Assuming the MAX2829 has already been programmed, to enable a TX RF output the user must program a 11001xxx into U2.103 112 104 NOTE! Do not turn on both the 2GHz and the 5GHz power amps at the same time! ALSO! Do not turn on both the RXENA and TXENA lines (not sure why?). 113 == Appendix == 105 114 106 === Connector J3 _F and I/O===115 === Connector J3 === 107 116 108 This is a 40-pin 2mm dual-inline connector which mates BiBo’s control signals, +3.3 VDC power and ground to WiBo102.117 This is a 40-pin 2mm dual-inline connector which mates !BiBo’s control signals, +3.3 VDC power and ground to !WiBo. 109 118 110 119 ||WiBo102 function||J3_F function||pin#||pin#||J3_F function||WiBo102 function||
