2 layers76 × 37 mm
Poweramp
M4a1x/nmr-spectrometer
My master thesis at D-CHAB (ETH Zürich) - Building a 25MHz NMR spectrometer
54 parts11GPL-3.0
4 layers206.7 × 105.8 mm
32-channel current source
M4a1x/nmr-spectrometer11My master thesis at D-CHAB (ETH Zürich) - Building a 25MHz NMR spectrometer
- Size
- 206.7 × 105.8 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 324
- Nets
- 287
- Pads
- 1,539
- Tracks, vias
- 2,313, 768
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 20 Feb 2023
- Updated
- 30 Sep 2023
Overview
32-channel current source is an open-source printed circuit board by M4a1x, from the M4a1x/nmr-spectrometer repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 206.7 × 105.8 mm with 324 parts on 287 nets, routed with 2,313 tracks and 768 vias.
It is built around the LMV358, NCV0372BDW and 0805ZD104KAT2A, with the TMCP1A106KTRF, ERJ-6DQF1R0V and RT0805FRE1310KL among its other parts. Its parts include 160 resistors, 112 capacitors, 36 ICs and 8 connectors.
Main components
7
LMV358
SOP-8-40℃~+125℃ 10pA 10pA 1MHz 2 2.5V~5.5V 20mA 20nV/√Hz@10kHz 2uV/℃ 40uA 5mV 600V/ms 65dB EMI filtering/RF suppression Rail-to-Rail Input, Rail-to-Rail Output SOP-8 Operational Amplifier ROHSTECH PUBLICOperational Amplifier
NCV0372BDW
SOIC-16-40V~40V -40℃~+125℃ 1 1.4MHz 1.4V/us 10nA 15mV 1A 20uV/℃ 22nV/√Hz@100kHz 500nA 90dB SOIC-16 Operational Amplifier ROHSonsemiOperational Amplifier
0805ZD104KAT2A
0805100nF 10V X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSKyocera AVXMultilayer Ceramic Capacitors MLCC - SMD/SMT
TMCP1A106KTRF
CASE-P-2012-12(mm)-55℃~+125℃ 10V 10uF 5.9Ω@100kHz ±10% CASE-P-2012-12(mm) Tantalum Capacitors ROHSVishay IntertechnologyTantalum Capacitors
ERJ-6DQF1R0V
0805-55℃~+155℃ 1Ω 500mW Thick Film Resistor ±1% ±100ppm/℃ 0805 Chip Resistor - Surface Mount ROHSPanasonicChip Resistor - Surface MountRT0805FRE1310KL
0805Chip Resistor - Surface MountYAGEOSBH11-NBPC-D08-SM-BK
SMDWire To Board ConnectorSullins Connector Solutions
README
hardware/transmit_receive_switch/active/README.mdTX/RX Switch
The T/R Switch needs to handle ~5W, max 10W in transmit power (Bruker max. 5W!). Two main options exist:
- passive T/R Switch (lambda/4 + passive diodes) as built by Alex. Possibly change the Diodes to Schottky diodes for smaller leak-through power. Why aren't we using PIN diodes?
- active T/R switch (lambda/4 + pin diode)
- built from discrete components, e.g.
- this Github by Menküc, explained in this Infineon AN)
- OCRA T/R Switch (PIN Diodes ~2CHF)
- commercial chip, e.g.
- QPC6324, 31dBm term. CW
- HMC849A, 33dBm CW through, 26.5dBm term. CW (thermal), absorptive
- HMC8038, 30dBm term. CW, 100MHz - 6GHz
- RFSW6024, 28dBm term max. CW driven simultaneously
- PE42553, 10us, power on: 36dbm CW/39.5dBm pulsed, terminated: ~30.5dBm pulsed (est.)/28dBm CW
- PE42020 max 26dBm CW term.
- PE42520 26dbm term. CW
- HMC1118, 28dBm term. CW
- HMC544A (reflective) (5W) used in Sinara Booster
- Skyworks SKY12208 PIN Diode Switch 50W, reflective?
- MASW-000932 MASW-000932 (max 80W/120W), requires high bias voltage?, reflective
- HMC874A, reflective, P0.1dB 36dBm, 30dB Return loss, 100ns
- MASWSS0178, P1dB 29dBm, 24ns, absorptive,
- (also see DigiKeys Antenna Switching Note or Digikeys RF Switch Note)
- 20CHF Commercial RF Switch used in SiLPA
- Mini circuits packaged SPDT active switch ZX80-DR230-S
- MSWA2-50+, MSWA-2-20+, too low P1dB (<20dBm)
M3SWA-2-50DR up to 20dBm used by OpenCoreNMR for pulse modulation
- built from discrete components, e.g.
Typical leakages are 30mVpp for GaAs switches and 300mVpp for PIN diode based switches (so ~10dB better). This AN also states that PIN Diodes can be used with frequencies >10MHz (GaAs down to DC) and are mainly limited by average power dissipation. GaAs is limited by peak voltage and current ratings inside the GaAs transistors. GaAs is faster.
For simplicity of use, a passive switch would be advantageous if possible. The passive solution should leak only a little power that can be clamped by the protection diodes before the amplifier. This has the advantage that we can see the ringing of the coil and accurately start measuring after it ringed down?
Next steps:
- For now Alex' amplifier can be used the 6dBm output power that leaks from input to output can be clamped at every stage of the amplifier chain.
- Since we don't have that much power the design could probably be made smaller, e.g. only one lambda/4 filter instead of three
- Use Schottky Diodes instead of normal signal switching diodes for a lower power leak
- A switch
Parts
324| Qty | Value | Footprint | References |
|---|---|---|---|
| 72 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C11, C12, C13, C14, C17, C18, C19, C101, C102, C103, C104, C107, C108, C109, C110 +56 |
| 64 | 2k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12, R102, R104, R107, R108, R112, R114, R117, R118, R122, R124, R127, R128, R132, R134, R137 +48 |
| 40 | 10u | Capacitor_Tantalum_SMD:CP_EIA-2012-15_AVX-P_Pad1.30x1.05mm_HandSolder | C1, C3, C10, C15, C16, C21, C22, C27, C28, C29, C31, C100, C105, C106, C111, C112 +24 |
| 32 | 1 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10, R19, R20, R100, R109, R110, R119, R120, R129, R130, R139, R140, R149, R150, R159, R160 +16 |
| 32 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R11, R13, R21, R101, R103, R111, R113, R121, R123, R131, R133, R141, R143, R151, R153 +16 |
| 32 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R15, R16, R25, R26, R105, R106, R115, R116, R125, R126, R135, R136, R145, R146, R155, R156 +16 |
| 16 | LMV358 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2, U4, U6, U8, U11, U13, U15, U17, U20, U22, U24, U26, U29, U31, U33, U35 |
| 16 | NCV0372 | 32-channel_current_source:SOIC-16W_7.5x10.3mm_P1.27mm_ThermalVias | U3, U5, U7, U9, U12, U14, U16, U18, U21, U23, U25, U27, U30, U32, U34, U36 |
| 6 | MountingHole_Pad | MountingHole:MountingHole_6.4mm_M6_ISO14580_Pad | H1, H2, H3, H4, H5, H6 |
| 4 | AD5676R | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1, U10, U19, U28 |
| 4 | Conn_02x08_Odd_Even | Connector_IDC:IDC-Header_2x08_P2.54mm_Vertical_SMD | J5, J6, J7, J8 |
| 3 | Conn_01x01 | Connector_Wire:SolderWirePad_1x01_SMD_5x10mm | J1, J2, J3 |
| 1 | Conn_02x05_Odd_Even | Connector_IDC:IDC-Header_2x05_P2.54mm_Vertical_SMD | J4 |
| 1 | LOGO | LOGO | G*** |
The 323 most common of 324 parts.
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Questions
How big is the 32-channel current source PCB?
It measures 206.7 × 105.8 mm and has 4 copper layers, 1.6 mm thick.
What parts does the 32-channel current source use?
324 parts, built around the LMV358, NCV0372BDW, 0805ZD104KAT2A and TMCP1A106KTRF. 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 32-channel current source KiCad files?
From the M4a1x/nmr-spectrometer repository on GitHub, at the commit this page was made from: the board is hardware/32-channel_current_source/32-channel_current_source/32-channel_current_source.kicad_pcb and its schematic hardware/32-channel_current_source/32-channel_current_source/32-channel_current_source.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 32-channel current source design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).