LT5560 Mixer Component Analysis
1:58
Reviewing the bill of materials.
Looking for "Pin description" in 5560f.pdf
Looking for "Table 1. Recommended External Component Values" in 5560f.pdf
Accessing knowledge base.
Here’s a summary of each non-ground net in your LT5560 mixer schematic, the components on that net (with their actual values), and the values recommended by the LT5560 datasheet (Table 3 and Table 7, Case 3 for 140 MHz matching):
Table
| Net Designator | Function | Components (Values) | Datasheet-Recommended Values (140 MHz Case) |
|---|---|---|---|
| Net 3 (IN+) | RF Input + | C2 22 pFL1 18 nH | Input-matching (Table 3): C = 22 pF, L = 18 nH |
| Net 6 (IN–) | RF Input – | C3 22 pFL3 18 nH | Input-matching (Table 3): C = 22 pF, L = 18 nH |
| Net 7 (LO+) | LO Input + | L4 18 nH | LO-matching (use same Table 3 values as RF input): C = 22 pF, L = 18 nH |
| Net 1 (LO–) | LO Input – | C1 22 pF | LO-matching (Table 3): C = 22 pF, L = 18 nH |
| Net 10 (OUT+) | Mixer Output + | C6 1.5 pFL5 220 nH | Output-matching (Table 7): C = 1.5 pF, L = 220 nH |
| Net 11 (OUT–) | Mixer Output – | C7 ––L6 220 nH | Output-matching (Table 7): L = 220 nH (no cap on – side for Case 3) |
| Net 14 (VCC) | Power Supply | C9 1 nF (bypass)C10 100 nF (additional decoupling)IC1 VCC pin | VCC bypass: 1 nF close to pin (datasheet §“VCC Pin Bypass”) |
| Net 2 (EN) | Enable Control | EN driven high (≥ 2 V) to enable; ties to VCC if unused | VEN ≥ 2 V to enable; tie to VCC if not used (datasheet §“EN Pin”) |
Notes:
- Input and LO matching networks both use the values from Table 3, Case 3 (for 140 MHz operation).
- Output matching uses Table 7, Case 3.
- VCC decoupling follows the datasheet’s “bypass with a 1 nF chip capacitor” recommendation; a parallel 100 nF improves broadband bypassing.
- All values and network configurations are taken directly from the LT5560 datasheet (Analog Devices 5560f).
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Constraint placement
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