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INA-30311-BLK

1 GHz Low Noise Silicon MMIC Amplifier

HP => Agilent Technologies 

INA-30311 Applications

Information

Introduction

The INA-30311 is a silicon RF

integrated circuit that provides an

easy-to-use solution for low noise

or multi-purpose gain block

applications up to 1000 MHz. This

two-stage amplifier design uses

resistive feedback to provide flat

gain over a wide frequency range.

This device is assembled in a

miniature, surface mount package

and is intended for use in low

cost wireless communication

products.

A unique feature of the INA-30311

is that it is designed with a 50 Ω

input impedance and an output

impedance that approaches 200 Ω

at lower frequencies. This imped-

ance converting feature is very

useful for applications such as

receiver IF circuits in which the

INA-30311 is followed by high

input impedance devices like

signal processing circuits, filters,

or mixed signal ICs.

In addition to simplifying the

match to higher impedance

devices, a key benefit of the

higher output impedance feature

is an improvement in power

efficiency.

Phase Reference Planes

The positions of the reference

planes used to measure

S-Parameters are shown in

Figure 9. As seen in the illustra-

tion, the reference planes are

located at the point where the

package leads contact the test

circuit.

REFERENCE

PLANES

Biasing

The INA-30311 is a voltage biased

device and operates from a single

+3 volt power supply. With a

current drain of 6 mA, this

amplifier is suitable for use in

battery powered applications. All

bias circuitry is fully integrated

into the IC eliminating the need

for external DC components. RF

performance is very stable for

3-volt battery supplies that may

range from 2.7 to 3.3 volts,

depending on battery “freshness”

or state of charge in the case of

rechargeable batteries.

While the INA-30311 was

designed for use in +3 volt battery

powered applications, the

internal bias regulation circuitry

allows it to be used with any

power supply voltage from +2.7

to +5 volts.

Typical Configurations

The way in which the INA-30311

is used depends on the particular

application and operating

frequency.

• For receiver IF amplifier appli-

cations up to several hundred

MHz, the relatively higher out-

put impedance level of the

INA-30311 may be used to

advantage when interfacing

directly with devices having

higher than 50 Ω input imped-

ances, such as certain signal

processing or mixed signal ICs.

This application is shown in

Figure 10.

INA-30

HIGH INPUT

IMPEDANCE

STAGE

• A second implementation,

shown in Figure 11, uses a

simple reactive network at the

amplifier’s output to match the

output impedance to 50 Ω.

This matched output arrangement

will provide an additional 0.9 dB

of gain and output power at

900 MHz when driving into a 50 Ω

stage.

• The third way to use the INA-

30311 is to simply cascade

several INA-30311’s with 50 Ω

stages and neglect the effects of

the output mismatch.

The 50 Ω cascade without

impedance matching, shown in

Figure 12, trades off the

improvement in stage gain and

output power for a more

simplified interstage circuit and

reduced circuit board space.

INA-30

MATCHED

50 Ω OUTPUT

Figure 11. Impedance Matched

Output.

INA-30

50 Ω

INPUT

INA-30

HIGH Z

OUTPUT

Figure 12. Simple Cascade without

Impedance Matching.

TEST CIRCUIT

Figure 9. Reference Planes.

Figure 10. INA-30311 Driving a High

Input Impedance Stage.

6-143

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