MAX9930EVKIT+【PDF 13/16 页】KIT EVAL FOR MAX9930

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2MHz to 1.6GHz 45dB RF-Detecting

Controllers and RF Detector

Filter Capacitor and Transient Response

In general, for the MAX9930/MAX9931/MAX9932, the

choice of filter capacitor only partially determines the

time-domain response of a PA control loop. However,

some simple conventions can be applied to affect tran-

sient response. A large filter capacitor, C CLPF , domi-

nates time-domain response, but the loop bandwidth

remains a factor of the PA gain-control range. The

bandwidth is maximized at power outputs near the cen-

ter of the PA’s range, and minimized at the low and

high power levels, where the slope of the gain-control

curve is lowest.

A smaller valued C CLPF results in an increased loop

bandwidth inversely proportional to the capacitor value.

Inherent phase lag in the PA’s control path, usually

caused by parasitics at OUT, ultimately results in the

addition of complex poles in the AC loop equation. To

avoid this secondary effect, experimentally determine

attenuation. A broadband resistive match is implement-

ed by connecting a resistor to ground at the external

AC-coupling capacitor at RFIN as shown in Figure 5. A

50 ? resistor (use other values for different input imped-

ances) in this configuration, in parallel with the input

impedance of the MAX9930–MAX9933, presents an

input impedance of approximately 50 ? . These devices

require an additional external coupling capacitor in

series with the RF input. As the operating frequency

increases over 2GHz, input impedance is reduced,

resulting in the need for a larger-valued shunt resistor.

Use a Smith Chart for calculating the ideal shunt resis-

tor value. Refer to the MAX4000/MAX4001/MAX4002

data sheet for narrowband reactive and series attenua-

tion input coupling.

the lowest usable C CLPF for the power amplifier of inter-

est. This requires full consideration to the intricacies of

the PA control function. The worst-case condition,

50 ? SOURCE

MAX9930

MAX9931

MAX9932

where the PA output is smallest (gain function is steep-

est) should be used because the PA control function is

50 ?

C C

RFIN

MAX9933

typically nonlinear. An additional zero can be added to

improve loop dynamics by placing a resistor in series

with C CLPF . See Figure 4 for the gain and phase

response for different C CLPF values.

R S

50 ?

C IN

V CC

R IN

Additional Input Coupling

There are three common methods for input coupling:

broadband resistive, narrowband reactive, and series

GAIN AND PHASE vs. FREQUENCY

Figure 5. Broadband Resistive Matching

SMALL-SIGNAL BANDWIDTH vs. C CLPF

80

MAX9930 fig04

180

10

60

40

GAIN

C CLPF = 2000pF

135

90

20

C CLPF = 200pF

C CLPF = 200pF

45

1

0

-20

0

-45

-40

-90

0.1

-60

-80

C CLPF = 2000pF

PHASE

-135

-180

-100

-225

0.01

10

100

1k

10k

100k

1M

10M 100M

100

1000

10,000

100,000

FREQUENCY (Hz)

Figure 4. Gain and Phase vs. Frequency

C CLPF (pF)

______________________________________________________________________________________

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