MGA-82563-BLK Ver la hoja de datos (PDF) - HP => Agilent Technologies

Número de pieza

componentes Descripción

Fabricante

MGA-82563-BLK

0.1– 6 GHz 3V, 17 dBm Amplifier

HP => Agilent Technologies 

A schematic diagram of the

application circuit is shown in

Figure 15. DC blocking capacitors

(C1 and C2) are used at the input

and output of the MMIC to isolate

the device from adjacent circuits.

While the input terminal of the

MGA-82563 is at ground potential,

it is not a current sink. If the input

is connected to a preceding stage

that has a voltage present, the use

of the DC blocking capacitor (C1)

is required.

RF

Input C1

C2

Vd

C4

RFC

C2

RF

Output

Figure 15. Schematic Diagram.

DC bias is applied to the

MGA-82563 through the RF

Output pin. An inductor (RFC), or

length of high impedance trans-

mission line (preferably λ/4 at the

band center), is used to isolate the

RF from the DC supply.

The power supply is bypassed to

ground with capacitor C3 to keep

RF off of the DC lines and to

prevent gain dips or peaks in the

response of the amplifier.

An additional bypass capacitor,

C4, may be added to the bias line

near the Vd connection to elimi-

nate unwanted feedback through

bias lines that could cause oscilla-

tion. C4 will not normally be

needed unless several stages are

cascaded using a common power

supply.

When multiple bypass capacitors

are used, consideration should be

given to potential resonances. It is

important to ensure that the

capacitors when combined with

additional parasitic L’s and C’s on

the circuit board do not form

resonant circuits. The addition of

a small value resistor in the bias

supply line between bypass

capacitors will often “de-Q” the

bias circuit and eliminate the

effect of a resonance.

The value of the DC blocking and

RF bypass capacitors (C1 - C3)

should be chosen to provide a

small reactance (typically

<5␣ ohms) at the lowest operating

frequency. The reactance of the

RF choke (RFC) should be high

(e.g., several hundred ohms) at

the lowest frequency of operation.

The MGA-82563’s response at low

frequencies is limited to approxi-

mately 100 MHz by the size of

capacitors integrated on the

MMIC chip.

The input and output of the

MGA-82563 are well matched to

50␣ Ω. Without external matching

elements, the input VSWR of the

MGA-82563 is ≤ 2.0:1 from

300␣ MHz to 6 GHz and the Output

VSWR is ≤ 1.6:1 from 100 MHz

through 6 GHz.

For applications requiring minimum

noise figure (NFo), some improve-

ment over a 50 Ω match is possible

by matching the signal input to the

optimum noise match impedance,

Γo, as specified in the “Typical

Noise Parameters” table. The data

in the table shows the noise match

to be very close to 50 Ω.

The completed application

amplifier with all components and

SMA connectors is shown in

Figure 16.

H

C1

IN

MGA-8-A

OUT

C2

RFC

C3

+V

C4

Figure 16. Complete Application Circuit.

6-214

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