2.4 GHz Receive Pre-Amplifier

Click image for PostScript version.

[new-prox-preamp]
Reversed PCB pattern  (16k PostScript)

Capacitors

Schematic Reference Value Description Package Supplier Supplier Part Number
C1 10 µF electrolytic, 10%, 6.3V SMT or leaded Digi-Key P2013-ND
C2, C7 470 pF ceramic, 5%, NP0, 50V 0805 SMT Digi-Key PCC471CGCT-ND
C3, C4 100 pF Johanson ceramic 5%, 50V 0805 SMT Newark 48F4817
C8 22 pF Johanson ceramic 5%, 100V 0504 SMT Newark 48F4909
C5, C6 1 pF Johanson ceramic +/- 0.1, 50V 0402 SMT Newark 48F4904

Inductors

Schematic Reference Value Description Package Supplier Supplier Part Number
L1 1.65 nH Coilcraft micro air core, 10% SMT Coilcraft 0906-2K
L2 31 Ohm @ 100 MHz ferrite bead, IDC 500 mA 1206 SMT Digi-Key 240-1028-1-ND

Resistors

Schematic Reference Value Description Package Supplier Supplier Part Number
R1 560 Ohms film, 5% 0603 SMT Mouser 301-560

Diodes

Schematic Reference Value Description Package Supplier Supplier Part Number
D1  Note 1 Schottky barrier diode, series configuration SOT-23 Digi-Key ZC2812ECT-ND

Integrated Circuits / Transistors

Schematic Reference Value Description Package Supplier Supplier Part Number
IC1 MAX2641 2.4 GHz low noise amplifier SOT-26 Maxim free sample

Other

Schematic Reference Value Description Package Supplier Supplier Part Number
BPF  Note 2 4DFA-2450T-10 Toko 3 pole bandpass filter Digi-Key TKS2618CT-ND
6 x 6 inch 1/32 inch double sided, 1 oz, FR-4 dielectric copper clad board Digi-Key PC45-S-ND
J1, J2 PCB mount SMA jacks Mouser 530-142-0701-801
0.020 inch silver solder Radio Shack 64-013

Notes

[1]  Any quality microwave diodes will work, like the 1N5711.  Should be in a SMT package.
[2]  Optional bandpass filter, not needed but highly recommended.

It's also possible to slightly increase the preformance of the pre-amplifier by using surface mount porcelain capacitors.

Also be sure to place the input and output matching capacitors in the exact locations as shown in the MAX2641 EVKIT datasheet.

Suppliers