Datenblatt-pdf.com


IAM-91563 Schematic ( PDF Datasheet ) - AVAGO

Teilenummer IAM-91563
Beschreibung 3V Downconverter
Hersteller AVAGO
Logo AVAGO Logo 




Gesamt 14 Seiten
IAM-91563 Datasheet, Funktion
IAM-91563
0.8–6 GHz 3V Downconverter
Data Sheet
Description
Avago’s IAM-91563 is an economical 3V GaAs MMIC mixer
used for frequency down-conversion. RF frequency cover-
age is from 0.8 to 6 GHz and IF ­coverage is from 50 to 700
MHz. Packaged in the SOT-363 ­package, this 4.0 sq. mm.
package requires half the board space of a SOT-143 and
only 15% the board space of an SO‑8 package.
At 1.9 GHz, the IAM-91563 ­ provides 9 dB of conversion
gain, thus eliminating an RF or IF gain stage normally
needed with a lossy mixer. LO drive power is nominally
only -5 dBm, eliminating an LO buffer amplifier. The 8.5 dB
noise figure is low enough to allow the system to use a
low cost LNA. The
system linearity for
-m6 odsBt mcomInmpuetrcIiPa3l ­
provides adequate
applications, but is
adjustable to 0 dBm.
The circuit uses GaAs PHEMT technology with proven reli-
ability, and uniformity. The MMIC ­consists of a cascode FET
structure that provides unbalanced gm modulation type
mixing. An on-chip LO buffer amp drives the mixer while
bias circuitry allows a single +3V supply (through a choked
IF port). The LO port is internally matched to 50 Ω. The
RF and IF ports are high impedance and require external
matching networks.
Surface Mount Package: SOT-363 (SC-70)
Pin Connections and Package Marking
MGA-86563 Pkg
LO 1
6 IF and Vd
GND 2
5 GND
RF 3
4 SOURCE
BYPASS
Note:
1. Package marking provides orientation and identification.
Features
Lead-free Option Available
+0 dBm Input IP3 at 1.9 GHz
Single +3V Supply
8.5 dB SSB Noise Figure at 1.9 GHz
9.0 dB Conversion Gain at 1.9 GHz
Ultra-miniature Package
Applications
Downconverter for PCS, PHS, ISM, WLL, and other
Wireless Applications
Attention: Observe precautions for
handling electrostatic ­sensitive devices.
ESD Human Body Model (Class 0)
Refer to Avago Application Note A004R:
Electrostatic Discharge Damage and Control.
Simplified Schematic
LO
1
RF
3
IF and Vd
6
SOURCE
BYPASS
4
GROUND
2, 5







IAM-91563 Datasheet, Funktion
IAM-91563 Applications Information Introduction
The IAM-91563 is a miniature downconverter developed
for use in superheterodyne receivers for commercial wire-
less applications with RF bands from 800 MHz to 6 GHz.
Operating from only 3 volts, the IAM-91563 is an excellent
choice for use in low current applications such as: 1.9 GHz
Personal Communication Systems (PCS) & Personal Handy
System (PHS), 2 GHz Digital European Cordless Telephone
(DECT), and 800 MHz cellular telephones (e.g., GSM, NADC,
JDC). Combined with Avago’s other RFICs and discrete
components housed in the same ultra-miniature SOT-363
package, the IAM-91563 also provides flexible, building-
block solutions for WLAN’s and wireless datacomm such
as PCMCIA RF modems as well as many Industrial, Sci-
entific and Medical (ISM) systems operating at 900 MHz,
2.5 GHz, and 5.8 GHz.
The IAM-91563 is a 3-port, downconverting RFIC mixer of
the cascode (common source - common gate) type that
uses a low level (-5 dBm) local oscillator (LO) to convert an
RF signal in the 800 MHz to 6 GHz range to an IF between
50 and 700 MHz. The basic mixing function takes place in
a cascode connected pair of FETs as shown in Figure 17.
IF
LO FET 2
RF FET 1
Figure 17. Cascode FET Mixer.
The received RF signal is connected to the gate of FET1
and the LO is applied to the gate of FET2. The purpose of
FET2 is to vary the transconductance of FET1 over a highly
nonlinear region at the rate of the LO frequency. This pro-
duces the nonlinearity required for frequency mixing to
take place. This type of mixer is also known as a “transcon-
ductance mixer.”The IF is taken from the drain of FET2.
An advantage of the cascode type of design is the inher-
ent isolation between the gates of the two FETs which re-
sults in very good LO-to-RF isolation. An integrated buffer
amplifier between the LO input and the gate of FET2 not
only increases the LO-RF isolation but also reduces the
amount of LO input power required by the mixer.
The IAM-91563 uses an innovative bias regulation circuit
that realizes several benefits to the designer. First, the
IAM-91563 operates with a single, positive device voltage
from 1.5 to 5 volts with stable performance over a wide
temperature range. Second, a unique feature of the IAM-
91563 allows the device current to be easily increased by
adding an external resistor to boost device current and
increase linearity.
Using a minimum of external components with a standard
bias of 3 volts/9 mA and LO power of ‑5 dBm, the IAM-91563
mixer achieves an RF to IF conversion gain of 9 dB at 1.9 GHz
with a noise figure of 8.5 dB and an input third order inter-
cept point of ‑6 dBm. LO-to-IF isolation is greater than 35
dB. Setting the bias for the higher linearity/higher current
mode (approximately 16 mA) along with an LO drive level
of -2 dBm will boost the input IP3 to approximately 0 dBm.
Test Circuit
The circuit shown in Figure 18 is used for 100% RF and DC
testing. The test circuit is impedance matched for an RF of
1890 MHz and an IF of 250 MHz. The LO is set at 1640 MHz and
-5 dBm for low side conversion. (High side conversion with an
LO of 2240 MHz would produce similar performance.) The RF
choke at the IF port is used to provide DC bias. Tests in this cir-
c(Iud)itpaarreamuseetdertsosghuoawrnanintetehtehteabGlteesto, Nf EFlteesct,tarincdalDSepveiccieficCautriorennst.
Vd
100 pF
220 nH (2)
Z = 50
IF 500 pF 68 nH
250 MHz
Figure 18. Test Circuit.
4.7 pF
0.5 pF
Z = 110
I=10.4 mm
RF
1890 MHz
Z = 50
LO
1640 MHz
Specifications and Statistical Parameters
Several categories of parameters appear within this data
sheet. Parameters may be described with values that are
either “minimum or maximum,”“typical,” or “standard devia-
tions.”
The values for parameters are based on comprehensive
product characterization data, in which automated mea-
surements are made on of a minimum of 500 parts taken
from 3 non-consecutive process lots of semiconductor
wafers. The data derived from product characterization
tends to be normally distributed, e.g., fits the standard “bell
curve.”
Parameters considered to be the most important to system
performance are bounded by minimum or maximum val-
ues. For the IAM‑91563, these parameters are: Conversion
Gofatinhe(Gsetesgt)u, NaroainseteFeigdupraer(aNmFetestte),rasnisd1D0e0v%icteeCstuerdre. nt (Id). Each
Values for most of the parameters in the table of Electri-
cal Specifications that are described by typical data are the
mathematical mean (µ), of the normal distribution taken
from the characterization data. For parameters where mea-
surements or mathematical averaging may not be practical,
such as the Typical Reflection Coefficients table or perfor-
mance curves, the data represents a nominal part taken
from the “center” of the characterization distribution. Typi-
cal values are intended to be used as a basis for electrical
design.


6 Page









IAM-91563 pdf, datenblatt
Designs for Other Frequencies
The same design methodology described above can be
applied to other wireless frequency bands. Design ex-
amples and measurement results for the 900 MHz and 2.4
GHz bands are shown in Figures 33 and 34.
Vd
IF
250
MHz
100 pF
220 nH
50
1000 pF
220 pF
180 nH
GC RF
GN GND
IF LO
15 pF
0.9 pF
50
10 nH
50
RF
2450
MHz
LO
2200
MHz
Measured results:
Conversion Gain = 10.6 dB
LO-RF Isolation = 21 dB
SSB Noise Figure = 7.1 dB
LO-IF Isolation = 33 dB
1 dB Compression = -7.0 dB RF-IF Isolation = 17 dB
P3 (Input) = -7 dBm
Operating conditions:
RF Frequency = 900 MHz
LO Drive Level = -5 dBm
IF Frequency = 80 MHz
DC Power = 3.0V @ 9 mA
LO Frequency = 980 MHz
Figure 33. 800-900 MHz Cellular and ISM Band Mixer.
Vd
IF
250
MHz
220 nH
50
500 pF
100 pF
0.5 pF
50
100 pF
68 nH
GC RF
GN GND
IF LO
4.7 pF
3.3 nH
110 , 3 mm
50
RF
2450
MHz
LO
2200
MHz
Measured results:
Conversion Gain = 7.7 dB
LO-RF Isolation = 16 dB
SSB Noise Figure = 11 dB
LO-IF Isolation = 35 dB
1 dB Compression = -8.7 dB RF-IF Isolation = 27 dB
IP3 (Input) = -7 dBm
Operating conditions:
RF Frequency = 2.45 GHz
LO Drive Level = -5 dBm
IF Frequency = 250 MHz
DC Power = 3.0V @ 9 mA
LO Frequency = 2.2 GHz
Figure 34. 2.4 GHz ISM Band Mixer.
SOT-363 PCB Footprint
A recommended PCB pad layout for the miniature SOT-
363 (SC-70) package used by the IAM-91563 is shown in
Figure 35 (dimensions are in inches). This layout provides
ample allowance for package placement by automated
assembly equipment without adding parasitics that could
impair the high frequency RF performance of the IAM-
91563. The layout is shown with a nominal SOT-363 pack-
age footprint superimposed on the PCB pads.
0.026
0.039
0.079
0.018
Dimensions in inches.
Figure 35. Recommended PCB Pad Layout for Avago’s SC70 6L/SOT-363
Products.
12

12 Page





SeitenGesamt 14 Seiten
PDF Download[ IAM-91563 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
IAM-915633V DownconverterAVAGO
AVAGO
IAM-915630.8-6 GHz 3V DownconverterAgilent(Hewlett-Packard)
Agilent(Hewlett-Packard)

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche