2 layers106 × 95.4 mm
2 layers84 × 30 mm
Watson
paretech/Watson7PCB layout and test results for a simple high dynamic range power meter based on the Analog Devices AD8307 Logarithmic Amplifier.
- Size
- 84 × 30 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 56
- Nets
- 24
- Pads
- 129
- Tracks, vias
- 758, 527
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 21 Sep 2013
- Updated
- 27 Apr 2014
Overview
Watson is an open-source printed circuit board by paretech, from the paretech/Watson repository on GitHub. It is a 2-layer board of 84 × 30 mm with 56 parts on 24 nets, routed with 758 tracks and 527 vias.
It is built around the AD8031AN, AD8307AN and 78L05, with the 79L05 among its other parts. Its parts include 22 capacitors, 10 resistors, 6 inductors, 5 ICs and 1 connector. It belongs with the sensors and measurement boards of this library.
Main components
4
AD8031AN
PDIP-8-40℃~+85℃ -5V~6V 1 10uV/℃ 15mA 15nV/√Hz@1kHz 2.7V~12V 2uA 35V/us 50nA 6mV 800uA 80MHz 80dB Rail-to-Rail Input, Rail-to-Rail Output PDIP-8 Operational Amplifier ROHSAnalog DevicesOperational AmplifierAD8307AN
PDIP-8-40℃~+85℃ Enable/shutdown function、Built-in filter Logarithmic Amplifier PDIP-8 Special Purpose Amplifiers ROHSAnalog DevicesSpecial Purpose Amplifiers
78L05
SOT-89-3-20℃~+120℃@(Tj) 1 1.7V 100mA 2mA 30V 40uV 49dB@(120Hz) 5V Fixed Over Temperature Protection、Short Circuit Protection Positive SOT-89-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSUMWVoltage Regulators - Linear, Low Drop Out (LDO) Regulators79L05
SOT-89-3-40℃~+85℃ 1 1.7V 150mA 35V 49dB@(120Hz) 5V 6mA Fixed Negative SOT-89-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSShikuesVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdWatson
Watson is a relatively simple RF power meter based on the "120 dB Measurement System" outlined in the Analog Devices (AD) AD8307 data sheet. Watson has a narrow and fixed measurement band centered on 10.7 MHz and was developed as the detector for a low cost spectrum analyzer design.
Parts
56| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | C | SM0603_Capa | C3, C6, C7, C8, C9, C12, C13, C14, C15, C16, C19 |
| 5 | 0.1u | SM0603_Capa | C5, C11, C18, C20, C21 |
| 5 | CONN_1 | PIN_ARRAY_1 | -12V, +12V, GND, GND, LV |
| 5 | L | SM0603_Inductor | L2, L3, L4, L5, L6 |
| 2 | 1n | SM0603_Capa | C17, C22 |
| 2 | 33u | c_tant_A | C1, C4 |
| 2 | R | SM0603_Resistor | R9, R10 |
| 2 | VAL** | Pad | , Pad |
| 2 | VAL** | hole | , hole |
| 1 | .1u | SM0603_Capa | C2 |
| 1 | 100k | SM0603_Resistor | R5 |
| 1 | 150p | SM0603_Capa | C10 |
| 1 | 187k | SM0603_Resistor | R1 |
| 1 | 20k | SM0603_Resistor | R6 |
| 1 | 28k | SM0603_Resistor | R2 |
| 1 | 330 | SM0603_Resistor | R3 |
| 1 | 4.7 | SM0603_Resistor | R8 |
| 1 | 464 | SM0603_Resistor | R4 |
| 1 | 5k | VRSM3932_JHOOK | RV1 |
| 1 | 750nH | 180mm_ChipCoil | L1 |
| 1 | 78L05 | sot89 | U1 |
| 1 | 79L05 | sot89 | U2 |
| 1 | 80.6k | SM0603_Resistor | R7 |
| 1 | AD603 | so-8 | U4 |
| 1 | AD8031 | sot23 | U3 |
| 1 | AD8307 | AD8307 | U5 |
| 1 | BNC | sma-edge-062 | P5 |
| 1 | BPF | SFEC | F1 |
| 1 | Val** | PIN_ARRAY_1 | GND |
Questions
How big is the Watson PCB?
It measures 84 × 30 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Watson use?
56 parts, built around the AD8031AN, AD8307AN, 78L05 and 79L05. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Watson KiCad files?
From the paretech/Watson repository on GitHub, at the commit this page was made from: the board is kicad/watson.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Watson design in my own project?
Its repository states no licence, so its author keeps all rights: ask paretech before reusing the design.
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