| 450 MHz 20 dBm multiplier pcb - second batch..... |
| Introduction This board uses a 10 MHz TCXO and multiplies the output by x45 in three stages (x3 x3 x5), finishing with a medium power mmic that takes the output power up to +20 dBm. A small part of the pcb remains unpopulated on this build. This is either because the circuitry is relevent for tx use only (the board can be used as a Tx driver), or it is an option that has to to be added seperately (the auto TCXO switch-off logic, where an external 10 MHz reference is sometimes required), the general idea being to keep the standard option as simple as possible. Details of the auto TCXO switch-off logic are given at the end of this page. The board is layed-out for either a leaded or smd TCXO module, and where components are supplied, it will be the smd version that is delivered. This runs from a 3,3v supply, and accordingly, the supply regulator for this (IC2) is a SOT89 packaged 78L03. When using you're own TCXO, fit a TS78L05ACY if a 5v rail is required |
|
| 1pF
0805 3 C24, 26, |
22uF tant 6 C2-5, 38, 39 | 78L03 SOT89 1 IC2 |
| 2p2
0805 2 C13, 14 |
0R 0805 1 R1 | 78M08 DPAK 2 IC1, 3 |
| 15pF
0805 2 C23, 25 |
22R 0805 2 R17, 18 | BGA6489 DPAK 1 IC4 |
| 22pF 0805
1 C27 |
47R 0805 1 R15 | BFS17 SOT23
3 Q1-3 |
| 82pF 0805
4 C10, 12, 15, 28 |
100R 0805 1 R11 | LLSD103A-07
1 D1 |
| 100pF 0805
1 C16 |
100R 1206 4
R2, 7, 12, 16 |
IQD TVXO009984
1 TCXO1 |
| 470pF 0805
1 C17 |
220R 0805 1 R6 | |
| 1nF
0805 8 C33-37, 40, 42, 43 |
1k 0805 2 R3, 8 | 10uH
1206
5 L7-10, 13 |
| 10nF
0805 3 C7, 22, 29 |
2k2 0805 3 R5, 10, 14 | Toko
378008
3 L1-3
(green) |
| 100nF 1206 2
C6, 8 |
10k pot 1 R20 | Toko
371044
3 L4-6 (red) |
| 100nF 0805 11
C1, 9, 11, 18-21, 30-32, 41 |
12k
0805 3 R4, 9, 13 |
Toko
1550 93474 2 L11,
12 (yellow) |
orientation of TCXO
|
solder blob links |