-16-

RF83//RF83C/RF83L/RF83CL ASK/OOK Receiver V2.0

 

Tel: +86‐755‐82973805  Fax: +86‐755‐82973550  E‐mail: sales@hoperf.com  http://www.hoperf.com 

14.Additional Applications Information

In addition to the basic operation of the RF83 the following enhancements can be made. In particular it is

strongly recommended that the antenna impedance is matched to the input of the IC.

14.1. Antenna Impedance Matching

As shown in table 4 the antenna pin input impedance is frequency dependant.

The ANT pin can be matched to 50 Ohms with an L-type circuit. That is, a shunt inductor from the

RF input to ground and another in series from the RF input to the antenna pin.

Inductor values may be different from table depending on PCB material, PCB thickness, ground

configuration, and how long the traces are in the layout. Values shown were characterized for a

0.031 thickness, FR4 board, solid ground plane on bottom layer, and very short traces. MuRata and

Coilcraft wire wound 0603 or 0805 surface mount inductors were tested, however any wire

wound inductor with high SRF (self resonance frequency) should do the job.

Frequency

(MHz)

300

12-j166

0.803-j0.529

15

72

305

12-j165

0.800-j0.530

15

72

310

12-j163

0.796-j0.536

15

72

315

13-j162

0.791-j0.536

15

72

320

12-j160

0.789-j0.543

15

68

325

12-j157

0.782-j0.550

12

68

330

12-j155

0.778-j0.556

12

68

335

12-j152

0.770-j0.564

12

68

340

11—j150

0.767-j0.572

15

56

345

11-j148

0.762-j0.578

15

56

350

11-j145

0.753-j0.586

12

56

355

11-j143

0.748-j0.592

12

56

360

11-j141

0.742-j0.597

10

56

365

11-j139

0.735-j0.603

10

56

370

10-j137

0.732-j0.612

12

47

375

10-j135

0.725-j0.619

12

47

380

10-j133

0.718-j0.625

10

47

385

10-j131

0.711-j0.631

10

47

390

10-j130

0.707-j0.634

10

43

395

10-j128

0.700-j0.641

10

43

400

10-j126

0.692-j0.647

10

43

405

10-j124

0.684-j0.653

10

39

410

10-j122

0.675-j0.660

10

39