RF3330 데이터 시트보기 (PDF) - RF Micro Devices

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RF3330

IF GAIN CONTROLLED AMPLIFIER

RF Micro Devices 

RF3330

Preliminary

Output

On the output, the losses due to the resistive matching

pad must also be calibrated out of the setup. Because

of the 1:1 transformer, the spectrum analyzer appears

as a 50Ω resistor in parallel with this circuit (see Figure

2). Equation 4 illustrates the calculation necessary to

obtain the amount of loss due to this matching circuit.

The balun also has an additional 0.5dB to 1.0dB of

3

loss, which is added in to the overall output losses.

This was verified with a spectrum analyzer probe. The

offset used in the test setup is 32.5dB on the spectrum

analyzer.

Resistive Pad Loss=

20 * log (25 / (470 + 25 + 470)) = -31.7 dB

Eq. 4

Frequency =

1 MHz to

150 MHz

Frequency =

1 MHz to

150 MHz

Signal Generator

Mini-Circuits

ZMSCJ-2-1

Divider

Figure 1. RF3330 Test Setup

RF3330

Resistive

Match

1:1

Transformer

Frequency =

1 MHz to

150 MHz

3330410 Evaluation Board

Spectrum Analyzer

R4

470 Ω

R3

51 Ω

50 Ω

R2

470 Ω

Figure 2. Equivalent Output Circuit

3-8

Rev A2 010820

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