LT5560 Mixer Component Analysis

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Reviewing the bill of materials.

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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 DesignatorFunctionComponents (Values)Datasheet-Recommended Values (140 MHz Case)
Net 3 (IN+)RF Input +C2 22 pFL1 18 nHInput-matching (Table 3): C = 22 pF, L = 18 nH
Net 6 (IN–)RF Input –C3 22 pFL3 18 nHInput-matching (Table 3): C = 22 pF, L = 18 nH
Net 7 (LO+)LO Input +L4 18 nHLO-matching (use same Table 3 values as RF input): C = 22 pF, L = 18 nH
Net 1 (LO–)LO Input –C1 22 pFLO-matching (Table 3): C = 22 pF, L = 18 nH
Net 10 (OUT+)Mixer Output +C6 1.5 pFL5 220 nHOutput-matching (Table 7): C = 1.5 pF, L = 220 nH
Net 11 (OUT–)Mixer Output –C7 ––L6 220 nHOutput-matching (Table 7): L = 220 nH (no cap on – side for Case 3)
Net 14 (VCC)Power SupplyC9 1 nF (bypass)C10 100 nF (additional decoupling)IC1 VCC pinVCC bypass: 1 nF close to pin (datasheet §“VCC Pin Bypass”)
Net 2 (EN)Enable ControlEN driven high (≥ 2 V) to enable; ties to VCC if unusedVEN ≥ 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).
Select input matching parts
Select output matching parts
Generate return loss plot
Annotate nets
Constraint placement
269 days
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    RF Mixer

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    This project represents an RF mixer circuit, leveraging an LT5560 IC from Analog Devices. It employs various inductors, capacitors, and connectors for signal input, output, and voltage supply. The design optimizes RF mixing performance for frequencies between 140 and 900 MHz. #RF #mixer #roject

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