Agilent Technologies 11867A? Manual do Utilizador descarregar pdf (Página 10)

Description

The HP 11867 A

limiter is a unidirectional, solid-state, passive device for use from 10

to 1800

MHz.

consists of four oxide-passivated silicon diodes: two PIN diodes and two

Schottky-Barrier diodes. These diodes are functionally integrated in a

500 transmission line as

part

of a low-pass filter with a cutoff frequency

(Fe)

of approximately 2.5

GHz.

The limiter has

no adjustments, and its diodes are not field-replaceable.

For noise considerations,

the

limiter behaves as a thermal resistance shunted across

the

transmission line. The excess noise temperature is less

than

20°

Kelvin. This results in a noise

figure

that

is essentially equal to

the

insertion loss below

the

limiting threshold. (Figure

1-1

shows typical insertion loss below

the

limiting threshold.)

The

VSWR

specification in Table

1-1

applies below

the

limiting threshold. (Typical

VSWR

into

either

port

is shown in Figure 1-2.)

VSWR

above

the

threshold is unpredictable, since

the

limiter effects its limiting by reflecting some of

the

input power.

Limiting is non-linear and depends on input power and ambient temperature. The typical

limiting curves shown in Figure

1-3

apply

ambient temperature of 25°C.

ill

-o

(/)

17.8

Ct:

::::J

I-

Ct:

CIFICA

TION

1.0

1.5

FREQUENCY

GHz

2.0

2.5

wn33b

Figure 1-2. Typical Return Loss Versus Frequency

11867A

Limiter

1·3

1 2 ... 5 6 7 8 9 10 11 12 13 14 15

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