RF2461 datasheet(7/14 Pages) RFMD

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RF2461

Rev B6 DS060925

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Application Schematic

VCC1

100 pF

33 nF

16 nH

4.3 nH

IF SEL

100 pF

VCC1

100 pF

Ω μstrip

620

4 pF

100 pF

0.1

μF

VCC1

22 k

47 k

3.3 nH

LNA GAIN

MIX GAIN

VCC2

VCC1

NOTE:

Microstrip Inductor, Z0 = 50 Ω, L = 102 mils

suggested compared values.

Ω*

33 nF

47 nH

IF+

IF-

IF2+

IF2-

LO IN

LNA IN

7.5 nH

Ω μstrip

L=130 mils

W=12 mils

Z0=50 Ω

ENABLE

IP SET

*This resistor improves NF and IIP3 for

VCC = 3.0 V.

BYPASS

See

Note 4

See

Note 5

See

Note 3

See

Note 1

See

Note 6

See

Note 8

See

Note 8

See

Note 8

See

Note 8

See

Note 7

See Note 2

See Note 8

See

Note 10

See Note 11

See

Note 9

NOTES:

1. DC blocking capacitor.

2. LNA emitter degenerator. As the value of inductance is increased, the gain will decrease, and the IIP3 will increase.

3. Mixer preamp degeneration inductor. As the value of inductance is increased, the gain will decrease, and the IIP3 will increase.

4. An external resistor connected to this pin sets the current of the preamp and the mixer. Higher resistance to ground results in lower current. See chart at end of datasheet.

5. An external resistor connected to this pin sets the current of the LNA when IPSET is high. Higher resistance to ground results in lower current. See chart at end of datasheet.

6. Mixer input matching inductor.

7. LO input matching resistor.

8. Bypass capacitor.

9. LNA output matching and bias choke.

10. For stability of the LNA.

11. LNA input and output matching.

12. Low pass path to ground for two-tone beat frequency for optimum IIP3 of LNA.

See Note 11

See Note 12

See Note 8

Output Interface Network

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