LT5560 Mixer Component Analysis

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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).
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J2
Frequency
760 MHz
J1
Frequency
900 MHz
J3
Frequency
140 MHz
L2
Inductance
15n H
L5
Inductance
270n H
L6
Inductance
270n H
L4
Inductance
15n H
L7
Inductance
270n H
L3
Inductance
6.8n H
L1
Inductance
6.8n H
C1
Capacitance
100p F
C8
Capacitance
33p F
J4
C9
Capacitance
1u F
EN
VCC
IC1
C7
Capacitance
4.7p F
C6
Capacitance
100p F
C2
Capacitance
4.7p F
VCC
C4
Capacitance
100p F
C10
Capacitance
1u F
C5
Capacitance
100p F
C3
Capacitance
4.7p F
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RF Mixer

RF Mixer
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Last updated by vasyl
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vasyl

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