RMDA20420 데이터 시트보기 (PDF) - Fairchild Semiconductor

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RMDA20420

20–42 GHz Broadband Driver Amplifier

Fairchild Semiconductor 

Vd1

Vd2

RF IN

Vd1 Vg2 alt

Vd2

Vd3

Vd4

Vg1

Vg2

Vg3

Vg4

RF OUT

Vg1

Vg2

Figure 6. RMDA20420 Configured as Doubler

For each input frequency and input power level, Vg1 was adjusted to peak the second harmonic. Small changes in Vg2 and

Vd2 at this point help in suppressing odd harmonics. Figure 7 shows the doubler performance over the 20 to 42GHz band

for a fixed input power level of +12dBm. The graph shows doubled frequencies with output power levels greater than

+16dBm over the 20-42GHz band. The graph also shows the increasing power level of the fundamental at the higher end

of the band since the fundamental frequency approaches the lower band edge of the amplifier passband. Based on these

measurements the RMDA20420 can be used a doubler to give desired frequencies anywhere in the 20-42GHz band with a

conversion gain up to 8dB and second harmonic power levels up to 20dBm.

30

20

Conversion

Gain=0

10

2x Fo

0

1x Fo

-10

-20

-30

20

22

24

26

28

30

32

34

36

38

40

42

Second Harmonic Frequency (GHz)

Figure 7. Measured Doubler Performance

©2004 Fairchild Semiconductor Corporation

RMDA20420 Rev. D

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