MAMDCC0002 datasheet, PDF - EEWORLD Datasheet

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MAMDCC0002: DescriptionVector Modulator, 1.805 to 1.88 GHz (DCS) and 1.93 to 1.99 GHz (PCS); CategoryWireless rf/communication Telecom circuit; File Size147KB，7 Pages; ManufacturerMACOM; Websitehttp://www.macom.com

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MAMDCC0002 Overview

Vector Modulator, 1.805 to 1.88 GHz (DCS) and 1.93 to 1.99 GHz (PCS)

MAMDCC0002 Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	MACOM
package instruction	QCCN, LCC32,.16X.24,20
Reach Compliance Code	unknow
JESD-30 code	R-XQCC-N32
JESD-609 code	e0
Number of terminals	32
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
encapsulated code	QCCN
Encapsulate equivalent code	LCC32,.16X.24,20
Package shape	RECTANGULAR
Package form	CHIP CARRIER
Certification status	Not Qualified
surface mount	YES
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	NO LEAD
Terminal pitch	0.5 mm
Terminal location	QUAD

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Application Note

AN3001

PIN diode Vector Modulators -

Fundamentals and Drive Requirements

Introduction

M/A-COM’s

Chip Scale Package

(CSP) vector

modulator platform offers a means of varying

attenuation and phase in a single surface mount

package. These vector modulators offer linear

phase and minimal amplitude ripple in their bands of

operation. Due to using PIN diodes as the active

devices, these vector modulators have high intercept

points. These vector modulators operate in tandem

with a dual linearizer, MADRCC0002 that has been

developed by M/A-COM.

•

Rev. V4

Case 2. If the diodes in the top VVA are set to

an impedance of 50 ohms, the top VVA will be

in a high loss state. The output of the bottom

VVA will have a phase of -90° or 90°, depend-

ing on the impedance of the terminating di-

odes. See the “B” or “/B” labels.

Case 3. If the output of the top VVA has a

phase of 0° with a magnitude of 1, and the out-

put of the bottom VVA has a phase of 90° with

a magnitude of 1, the resultant vector will have

a magnitude of 1.414 (square root of 2) at an

angle of 45°.

•

Basic Vector Modulator Operation

The block diagram for the vector modulator is given

in Figure 1. The vector modulator consists of four

elements: an input quadrature hybrid, two voltage

variable attenuators (four-port quadrature hybrids

with both outputs terminated in PIN diodes), and an

output power combiner.

One of the keys to understanding how vector

modulators work is to understand that there is a

phase shift of 180° when the impedance of the

diodes (for a single VVA) crosses 50 ohms. For

diode impedance of greater than 50 ohms, there is

no phase change when the signal reflects off of the

diodes. This can also be noted on the Smith Chart.

Note that when the impedance of the diodes is less

than 50 ohms, there is no phase shift. The following

will describe the vectors in three cases. See Figure

2 for additional insight into how single vectors pass

through the vector modulator.

•

Case 1. If the diodes in the bottom VVA are set

to an impedance of 50 ohms, the bottom VVA

will be in a high loss state. The output of the top

VVA will have a phase of 0° or 180°, depending

on the impedance of the terminating diodes.

See the “A” or “/A” labels.

Definition of RF Parameters

It is helpful to define some of the parameters used

to specify the electrical performance of a vector

modulator, so that the specifications are clearly

understood. Note that this type of vector modulator

is designed to have continuous phase shift over

360°.

Reference Loss: This is the minimum loss where

all phases from 0° to 360° are available. This is

measured at the center frequency of the specified

band.

Attenuation Range: This is the attenuation (relative

to the reference loss), where the performance of

the vector modulator is defined. For example, if a

vector modulator has an attenuation range of 10

dB, and a reference loss of 12 dB, the vector

modulator will operate over an absolute loss range

between 12 and 22 dB. Note that in the case of

SA90-0001, the vector modulator has a higher at-

tenuation range than the specified range, but the

attenuation is difficult to control, and the phase line-

arity and amplitude ripple start to degrade.

Frequency Band (MHz)

925 - 960

1930 - 1990

2040 - 2240

Band

GSM

PCS

UMTS

Model Number

MAMDCC0005

MAMDCC0002

SA90-0001

Model Number of Prototype with Driver

MAMDCC0005-DC000

MAMDCC0002-DC000

SA90-0001-DC000

Availability

Q2 2002

In Stock

Table 1. Selection Guide for Vector Modulator

Visit www.macomtech.com for additional data sheets and product information.

•

North America

Tel: 800.366.2266 •

Europe

Tel: +353.21.244.6400

•

India

Tel: +91.80.4155721

•

China

Tel: +86.21.2407.1588

M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make

changes to the product(s) or information contained herein without notice.

Application Note

AN3001

PIN diode Vector Modulators -

Fundamentals and Drive Requirements

PCB Design Guidelines

Rev. V4

The outline drawing for the vector modulator is provided in Figure 7. The recommended PC board layout is pro-

vided in Figure 8. Note that the topology of the bias components on the layout is similar to the topology of bias

components on the schematic. It is important to have the inductors as close to the vector modulator as possible.

If the inductors are rotated around the Smith chart, they will look like capacitors, and will not provide the high

impedance to the RF signal. If the RF signal is not blocked, there can be coupling between the output ports of

the 90° hybrids, which will degrade the performance of the vector modulator. The capacitors should be centered

between the inductors and as close as possible to the inductors, as shown in the PC board layout.

The paddle (base) of the package is grounded to optimize the RF performance of the vector modulator. A chip

scale package (CSP) was used to minimize the amount of PC board space that the end user would require.

There are two RF connections (RF IN and RF OUT) and four bias connections. All of the other connections are

ground. RF IN and RF OUT should be connected to 50 ohm transmission lines. It is preferred to select the PC

board material so that the RF lines are less than 20 mils wide to minimize coupling from the RF lines to the bias

circuit. The lines in the bias circuit should be approximately 6 mils wide to minimize cross coupling.

The recommended solder for mounting surface mount packages is Sn63 (63% Sn, 37% Pb) because it is a

eutectic compound with a melting point (183ºC) high enough to exceed the standard operating limit of the de-

vices, but low enough to avoid damaging internal circuitry during proper solder reflow operations.

Figure 3. Schematic of Dual Linearizer Driving Vector Modulator

Visit www.macomtech.com for additional data sheets and product information.

•

North America

Tel: 800.366.2266 •

Europe

Tel: +353.21.244.6400

•

India

Tel: +91.80.4155721

•

China

Tel: +86.21.2407.1588

M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make

changes to the product(s) or information contained herein without notice.

MAMDCC0002 Related Products

	MAMDCC0002	AN3001
Description	Vector Modulator, 1.805 to 1.88 GHz (DCS) and 1.93 to 1.99 GHz (PCS)	PIN diode Vector Modulators - Fundamentals and Drive Requirements

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