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MRFIC1854A 데이터시트 PDF




Motorola Semiconductors에서 제조한 전자 부품 MRFIC1854A은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 MRFIC1854A 기능
기능 CDMA Upmixer / Exciter
제조업체 Motorola Semiconductors
로고 Motorola Semiconductors 로고


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MRFIC1854A 데이터시트, 핀배열, 회로
Advance Information
1.9 GHz CDMA
Upmixer/Exciter
The MRFIC1854A is an integrated upmixer and exciter amplifier designed
specifically for PCS CDMA digital cellular radios. The exciter amplifier
incorporates a temperature compensated linear gain control and selectable
bias to reduce power consumption. The design utilizes Motorola’s
RF BiCMOS1 process to yield superior performance in a cost effective
monolithic device.
Total Supply Current CDMA Mode = 55 mA Typical
65 dB Dynamic Range Gain Control
Upmixer Output IP3 = 6.0 dBm Typical
Exciter Output IP3 = 22 dBm Typical
Supply Voltage Range = 2.7 to 3.6 V
Adjacent Channel Power (ACPR) @ 1.25 MHz Offset
(Pout = 3.0 dBm) = –58 dBc Typical
Order this document by MRFIC1854A/D
MRFIC1854A
1.9 GHz CDMA
UPMIXER/EXCITER
SEMICONDUCTOR
TECHNICAL DATA
20
1
(Scale 2:1)
PLASTIC PACKAGE
CASE 948M
(TSSOP–20EP, Tape & Reel Only)
Simplified Block Diagram
IF Vcntrl
LO
IF In+
IF In–
Exciter Out
LO Buffer
RF Out+
RF Out–
Exciter In
PIN CONNECTIONS
IF In+ 1
Enable1 2
LO In 3
Bias Select 4
IF Vcntrl
VCC3
Gnd
5
6
7
VCC1 8
RF Vcntrl 9
Exciter Out 10
20 IF In–
19 VCC4
18 RF Out+
17 RF Out–
16 Gnd
15 Gnd
14 Gnd
13 Exciter In
12 VCC2
11 Enable2
(Top View)
Gain
Bias Control
Bias Select
RF Vcntrl
This device contains 305 active transistors.
This document contains information on a new product. Specifications and information herein
arMe OsuTbjOecRt tOo cLhAangWe IwRithEoLuEt nSotSiceS. EMICONDUCTOR
SOLUTIONS – RF AND IF DEVICE DATA
ORDERING INFORMATION
Device
Operating
Temp Range
Package
MRFIC1854AR2 TA = –40 to 85°C TSSOP–20EP
© Motorola, Inc. 2000
Rev 0
1




MRFIC1854A pdf, 반도체, 판매, 대치품
IF In+
C1 L1
C2
Enable
LO In
Bias Select
IF Vcntrl
VCC3
T1
C3
C4 C5
VCC1
RF Vcntrl
Exciter Out
T2
C6 C7
C8
VCC Exciter
C9
MRFIC1854A
Figure 1. Application Circuit
L4 C19
IF In–
1 20
2
IF AGC
19
3
Mixer
18
4 17
5
6 LO Buffer
16
15
7 14
8 13
9 Exciter RF AGC 12
10 11
C18
L3
T4
C17
C15
C16
T3
VCC4
RF Out
C14
T5 C13
Exciter In
C20
VCC2
C11 C12
Tx Enable
L2
C10
C1, C19
C2, C18
C3
C4, C6, C9, C12, C16
C5, C8, C10, C11, C13, C15, C17
C7
C14
C20
1.0 nF
4.7 pF
1.7 pF
10 nF
30 pF
47 pF
3.6 pF
1.0 pF
L1, L4
L2
L3
T1
T2
T3
T4
T5
220 nH
10 nH
18 nH
50 Microstrip, L = 670 mils
50 Microstrip, L = 150 mils
50 Microstrip, L = 400 mils
50 Stripline, L = λ/2 @ 1880 MHz
50 Microstrip, L = 350 mils
NOTES: 1. IF ports matched to 50 for testing purposes.
2. Microstrip line and C7 form part of RF AGC/Exciter interstage match.
3. Er = 4.45 and board thickness = 18 mils.
4 MOTOROLA WIRELESS SEMICONDUCTOR
SOLUTIONS – RF AND IF DEVICE DATA

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MRFIC1854A 전자부품, 판매, 대치품
MRFIC1854A
APPLICATION INFORMATION
Design Philosophy
The MRFIC1854A has three operating states, enable,
standby, and disable. These states are controlled by the truth
table shown in Table 1. The device is fully operational during
the enable state and the bias level can be selected. A high
bias current for maximum power CDMA or a lower bias
current for CDMA at lower powers can be selected via the
Bias Select pin. In the high current CDMA mode, the
quiescent current is increased to maximize the linearity of the
device. In the lower current bias state, the quiescent current
is reduced to save current during lower power CDMA
operation. The standby mode can be used to reduce current
consumption during Voice Activity Factoring. In the standby
mode, the LO buffer remains on to prevent VCO pulling and
the bandgap reference bias circuit remains on to assure rapid
device turn on. Current consumption in standby mode is 10
mA typical. The disable mode is used to turn the
MRFIC1854A completely off. Leakage current in this mode is
only a few microamps.
The mixer is a double–balanced “Gilbert–cell” design with
a balanced LO buffer amplifier. The input and output of the
mixer are differential. The IF AGC is a differential amplifier
that uses the “current steering” method for gain control. The
IF AGC/mixer combination has 16 dB of gain and typically
draws 20 mA quiescent current in the CDMA mode. An
external filter is required between the mixer and RF AGC
amplifier to reduce RX band noise.
Figure 1 shows the applications circuit for the
MRFIC1854A. In this circuit, the IF ports of the IF AGC have
been matched to 50 for testing purposes. In the actual
application, the differential IF ports of the mixer would be
impedance matched to an IF SAW filter. The differential
impedance of the IF ports is 1600 ohms. The RF output of the
mixer is configured as a differential output. A stripline balun is
used to convert the RF output to single ended. DC current to
the open collector output of the mixer is provided by inductor,
L3 (18 nH) and transmission line, T4. Transmission lines T3
and T4, and capacitors C15 (30 pF) and C14 (3.6 pF) form
the balun/output match for the mixer.
The RF AGC amplifier is a single–ended cascode design
employing the standard “current steering” method of gain
control. It’s ground is brought out through pin number 15 so
inductance can be added to degenerate the gain for a lower
noise floor. The maximum gain is around 13 dB. It typically
draws 9.0 mA quiescent current in CDMA mode. The RF
Vcntrl signal is buffered with an on–chip OpAmp then
preconditioned with temperature compensation and dB/V
linearization before being applied to the RF AGC amplifier.
Transmission line T2 and capacitor C7 (47 pF) are for the
interstage match between the RF AGC and the exciter
amplifier.
The exciter amplifier is a simple common emitter design. It
is grounded directly to the exposed pad which results in 12
dB of gain. It typically draws 24 mA bias current in CDMA.
Inductor L2 (10 nH), capacitor C8 (30 pF), and C10 (30 pF)
provide the output matching. L2 also provides a DC current
path for the open collector output.
Noise Power Considerations
In CDMA systems, the handset is required to dynamically
adjust its output power to specific levels. This requires a
dynamic range of as much as 90 dB from the transmitter.
Another key performance specification in CDMA systems is
the output noise power, both in band and out of band. Noise
power specifications has caused the noise figure of the
transmitter to become an important system consideration.
The cascaded noise figure of the transmitter can be analyzed
with the same equation used in receiver analysis. The only
difference is the noise source is from the transmitter
(modulator) instead of the atmosphere.
Noise
Source
Gain =
Noise Figure =
G1
NF1
G2 G3
NF2 NF3
+ ) * ) *NFcascaded
NF1
NF2 1
G1
NF3 1
G1G2
This equation above shows that the cascaded noise figure
is better if the gain is higher and the noise figure is lower for
the stages close to the noise source. For this reason, it is
advantageous to implement some of the gain control of a
CDMA transmitter in the RF section. The MRFIC1854A
integrates a RF AGC amplifier after the upmixer to improve
the overall noise figure of the transmitter.
MOTOROLA WIRELESS SEMICONDUCTOR
SOLUTIONS – RF AND IF DEVICE DATA
7

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부품번호상세설명 및 기능제조사
MRFIC1854A

CDMA Upmixer / Exciter

Motorola Semiconductors
Motorola Semiconductors

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