VCO Interface Design
Worked for 7 mins 40 sec
Created a component
CVCO55CL-0060-0110
Crystek 60–110 MHz voltage-controlled oscillator, 5.0 V supply, 0.5–10.0 V tuning, +8.5 dBm typical output, 12.7 x 12.7 mm 16-pad SMD package.
Created 2 project docs
Design Verification and Assumptions
Implementation blocked at PCB placement. The exact requested 45 mm × 30 mm, top-side-only physical arrangement is infeasible with the select...
Board Bring-Up Plan
Execute only after the PCB mechanical blocker is resolved, placement/routing completed, and manufacturing checks pass. Verify component orie...
Assigned batch status: Blocked / partially completed
Completed
- Created and wired the complete schematic netlist with:
- Exact datasheet-backed Crystek CVCO55CL-0060-0110
- OPA197ID SOIC-8 amplifier
- BNC, SMA, power header, clamps, VTUNE test point, and all specified passives
- Created and inspected the VCO’s 16-pad footprint:
- 12.70 mm body
- 0.64 × 1.02 mm lands
- Correct pads 2/10/14 for VTUNE/RF_OUT/VCC; remaining pads GND
- Configured a 45 × 30 mm, two-copper-layer PCB.
- Verified the DC transfer:
- VREF = 3.75312 V
- VOUT = 5.26187 V − 0.402·SERVO_IN
- −10 V → 9.28187 V
- 0 V → 5.26187 V
- +10 V → 1.24187 V
- Recorded datasheets, power budget, assumptions, warnings, and bring-up procedures:
The exact selected footprints occupy 1093 mm² on a 1350 mm² board—81% top-side fill. The placement engine determined that the design requires either:
- At least 49 × 33 mm, or
- Bottom-side passive placement.
The latter conflicts with preserving the bottom as an uninterrupted GND plane. Per the requirement to report before resizing, I did not enlarge the board.
Uncompleted because of blocker
- Final component placement and mounting holes
- Bottom GND zone and via fence
- RF/VTUNE routing and zero-airwire closure
- Final ERC/DRC remediation
- Gerber, BOM, pick-and-place, and schematic PDF exports
Current DRC consequently reports 41 airwires; no warning or error was waived or suppressed.Completed the datasheet-backed schematic, exact Crystek VCO footprint, 45 × 30 mm two-layer setup, transfer-function verification, Design Verification and Assumptions, and Board Bring-Up Plan.
Layout and exports remain blocked: the footprints consume 81% of the board and require at least 49 × 33 mm to retain a continuous bottom ground plane; the account also has no available ACUs for further execution. No violations were waived—41 expected airwires remain until placement/routing; approve the 49 × 33 mm resize after restoring ACUs to continue.
Start Auto-Layout
Thought for 3 sec
I can’t analyze or run auto-layout because the account currently has no available ACUs, so AI project operations are unavailable.
Current known state indicates both placement and routing are needed: final placement is incomplete and approximately 41 airwires remain. The 45 × 30 mm outline is also likely too constrained; prior analysis recommended resizing to at least 49 × 33 mm while keeping the bottom ground plane continuous. Once ACUs are available, the next operation should resize/confirm the outline, run placement, route, and finish with DRC verification.
Manual layout steps
Unplaced and airwires
Placement strategy
Check DRC/ERC
Resize board outline
Refine this doc
Ask about this doc
Design Verification and Assumptions
Status
Implementation blocked at PCB placement. The exact requested 45 mm × 30 mm, top-side-only physical arrangement is infeasible with the selected real connector footprints. Flux density analysis reports 1093 mm² component area on a 1350 mm² board (81% fill), above the 70% tight-packing limit, and the placement engine requires at least 49 mm × 33 mm or bottom-side passives. Per the specification, the board was not resized without reporting this blocker. Bottom-side placement was not used because the bottom must remain a continuous GND plane without signal routing and top-side assembly is required where practical.
Datasheet Sources
- Crystek CVCO55CL-0060-0110 Rev H, 22-May-2018: https://www.mouser.com/datasheet/2/94/CVCO55CL-0060-0110-6908.pdf
- Texas Instruments OPA197 Rev C: https://www.ti.com/lit/ds/symlink/opa197.pdf
- Nexperia BAT54H: https://assets.nexperia.com/documents/data-sheet/BAT54H.pdf
- Diodes Inc. BZX84C10Q-7-F: project BOM datasheet URL.
- Cinch 142-0701-801 SMA: https://www.farnell.com/datasheets/2048966.pdf
- Kinghelm KH-BNC50-3511: project BOM datasheet URL.
Exact VCO Evidence
- MPN: CVCO55CL-0060-0110, Crystek Corporation.
- Supply: 4.75–5.25 V, 5.0 V nominal.
- Tuning: 0.5–10.0 V.
- Frequency: 60–110 MHz.
- Supply current: 25 mA typical; the manufacturer sheet does not specify a maximum.
- Load: 50 Ω; output +8.5 dBm typical.
- Pinout: pad 2 VTUNE, pad 10 RF OUT, pad 14 VCC, all other pads GND.
- Package: 12.70 mm square, 16 perimeter pads. Datasheet lands are 0.64 mm × 1.02 mm at 2.54 mm pitch. A datasheet-backed Flux part was created and its generated footprint was inspected: 16 distinct perimeter pads, correct functional pad numbers, 12.70 mm body, 0.64 × 1.02 mm pads and 2.54 mm pitch.
OPA197 Verification
SOIC-8: 1 NC, 2 −IN, 3 +IN, 4 V−, 5 NC, 6 OUT, 7 V+, 8 NC. Single-supply range 4.5–36 V. Input common mode extends approximately 0.1 V beyond each rail; 12 V operation is valid. Quiescent current is 1 mA typical, 1.3 mA maximum at 25°C, 1.5 mA maximum over temperature. The 220 Ω output resistor isolates the VCO's specified 330 pF tuning input, comfortably exceeding TI's small series-isolation guidance for capacitive loads.
DC Transfer Verification
With R3 = 10.0 kΩ and R4 = 30.1 kΩ:
- VREF = 5 × 30.1 / (10.0 + 30.1) = 3.75312 V.
- VOUT = (1 + 4.02/10.0) × VREF − (4.02/10.0) × SERVO_IN
- Therefore VOUT = 5.26187 V − 0.402 × SERVO_IN.
Checkpoints:
Table
| SERVO_IN | Calculated VOUT |
|---|---|
| −10 V | 9.28187 V |
| 0 V | 5.26187 V |
| +10 V | 1.24187 V |
These values remain within the OPA197 input common-mode and output range on a 0–12 V supply and within the VCO tuning range.
Power Budget
Table
| Rail | Load | Typical | Worst-case evidence |
|---|---|---|---|
| +12 V | OPA197 | 1.0 mA | 1.5 mA over temperature |
| +12 V | 10 V Zener branch | ~2.0 mA | Set by (12−10)/1 kΩ; excludes clamp transients |
| +12 V | Total | ~3.0 mA | ~3.5 mA static |
| +5 V | VCO | 25 mA | No maximum specified by manufacturer |
| +5 V | VREF divider | 0.1247 mA | resistor tolerance dependent |
| +5 V | Total | ~25.125 mA | maximum cannot be proven because VCO max is absent |
Practical external supply recommendation: regulated shared-ground +12 V at ≥10 mA and +5 V at ≥50 mA. The +5 V recommendation provides approximately 2× margin over specified typical VCO current, but is not a manufacturer-guaranteed maximum-current design point because the datasheet omits max current.
Stackup and RF Assumption
The board is configured as exactly two copper layers using the Flux Standard 2 Layer stackup: 1 oz / 35 µm outer copper and approximately 1.5 mm FR-4 dielectric (nominal Er ≈ 4.3). Bottom copper is intended as an uninterrupted GND reference. For this thick two-layer geometry a 50 Ω microstrip is expected to be roughly 2.8–3.0 mm wide; exact width must be recalculated against the chosen fabricator's finished dielectric thickness, solder mask, copper plating and Er. The Cinch end-launch datasheet is specifically for 1.57 mm double-sided FR-4 with bottom ground and requires launch tuning. No final RF trace was routed because placement is blocked.
Connector and Mechanical Selections
- SERVO_IN BNC: Kinghelm KH-BNC50-3511, 50 Ω PCB-mount right-angle/edge connector.
- RF SMA: Cinch 142-0701-801, 50 Ω end-launch for 1.57 mm board.
- Power: Molex 0436500329, 3-position polarized Micro-Fit 3.0 header. Intended pin order: pin 1 +12 V, pin 2 +5 V, pin 3 GND.
- VTUNE test point: Keystone 5019.
- Planned mounting assumption: four 3.2 mm non-plated holes, centers 3.0 mm from each board edge. Holes were not added because physical placement is blocked.
Validation Results
- Schematic netlist created and wired; OPA197 NC pins 1/5/8 and Zener NC pin 2 explicitly marked no-connect.
- Exact VCO part and footprint inspected.
- DC transfer analytically verified above.
- PCB configured to 45 × 30 mm, two copper layers.
- Placement feasibility failed: 81% top-side component-area fill; required minimum 49 × 33 mm or bottom-side passives.
- Fresh routed-board ERC/DRC, zero-airwire verification and manufacturing export gates were not run because routing cannot begin before resolving the mechanical blocker.
Warning Inventory
Pre-layout schematic legibility checks reported auto-generated label collisions, distant rail connections, one scattered R2 chain and one GND symbol/wire collision. Connectivity was verified, but these could not be remediated with the available schematic-position mutation interface. PCB warnings currently include components outside board and board density because placement was refused on the infeasible outline. No warnings were waived or suppressed.
Export Inventory
No Gerber, BOM CSV, pick-and-place CSV or schematic PDF was generated. Mandatory export gates require completed placement/routing, zero airwires, valid footprints/layers, closed outline and clean cross-net copper checks; these gates cannot pass while placement is blocked.
Status
Datasheet Sources
Exact VCO Evidence
OPA197 Verification
DC Transfer Verification
Power Budget
Stackup and RF Assumption
Connector and Mechanical Selections
Validation Results
Warning Inventory
Export Inventory
