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ADL5358ACPZ-R7

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ADL5358
Rev. 0 | Page 16 of 24
SPURIOUS PERFORMANCE
All spur tables are (N × f
RF
) − (M × f
LO
) and were measured using the standard evaluation board. Mixer spurious products are measured
in dBc from the IF output power level. Data was measured only for frequencies less than 6 GHz. Typical noise floor of the measurement
system = −100 dBm.
5 V Performance
V
S
= 5 V, I
S
= 350 mA, T
A
= 25°C, f
RF
= 900 MHz, f
LO
= 1103 MHz, LO power = 0 dBm, RF power = −10 dBm, R1 = R4 = 1.3 kΩ,
R2 = R5 = 1 kΩ, VGS0 = VGS1 = VGS2 = 0 V, and Z
O
= 50 Ω, unless otherwise noted.
M
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
N
0 −28.0 −21.5 −59.0 −44.2 −71.2
1
−52.4 0.0 −70.8 −42.4 −67.8 −65.5 −86.2
2
−74.8 −73.1 −78.2 −90.2 −77.6 <−100 −91.0 <−100
3 <−100 <−100 <−100 −91.1 <−100 <−100 <−100 <−100
4 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
5
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
6
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
7 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
8
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
9
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
10 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
11 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
12
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
13
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
14 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
3.3 V Performance
V
S
= 3.3 V, I
S
= 200 mA, T
A
= 25°C, f
RF
= 900 MHz, f
LO
= 1103 MHz, LO power = 0 dBm, RF power = −10 dBm, R1 = R4 = 1.2 kΩ, R2 =
R5 = 400 Ω, VGS0 = VGS1 = VG2 = 0 V, and Z
O
= 50 Ω, unless otherwise noted.
M
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
N
0
−33.3 −23.7 −49.1 −41.3 −82.9
1
−46.3 0.0 −64.4 −39.4 −71.2 −73.1 −86.1
2 −68.2 −61.5 −78.4 −81.2 −71.8 −94.6 −88.8 <−100
3
−99.9 −90.6 −95.2 −75.7 <−100 <−100 <−100 <−100
4
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
5 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
6 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
7
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
8
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
9 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
10
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
11
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
12 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
13 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
14
<−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100 <−100
ADL5358
Rev. 0 | Page 17 of 24
CIRCUIT DESCRIPTION
The ADL5358 consists of two primary components: the radio
frequency (RF) subsystem and the local oscillator (LO) subsystem.
The combination of design, process, and packaging technology
allows the functions of these subsystems to be integrated into
a single die, using mature packaging and interconnection
technologies to provide a high performance, low cost design
with excellent electrical, mechanical, and thermal properties.
In addition, the need for external components is minimized,
optimizing cost and size.
The resulting balanced RF signal is applied to a passive mixer that
commutates the RF input with the output of the LO subsystem.
The passive mixer is essentially a balanced, low loss switch that
adds minimum noise to the frequency translation. The only
noise contribution from the mixer is due to the resistive loss of
the switches, which is in the order of a few ohms.
Because the mixer is inherently broadband and bidirectional, it
is necessary to properly terminate all the idler (M × N product)
frequencies generated by the mixing process. Terminating the
mixer avoids the generation of unwanted intermodulation
products and reduces the level of unwanted signals at the input
of the IF amplifier, where high peak signal levels can compromise
the compression and intermodulation performance of the system.
This termination is accomplished by the addition of a sum network
between the IF amplifier and the mixer and in the feedback
elements in the IF amplifier.
The RF subsystem consists of integrated, low loss RF baluns,
passive MOSFET mixers, sum termination networks, and IF
amplifiers. The LO subsystem consists of an SPDT-terminated FET
switch and two multistage limiting LO amplifiers. The purpose of
the LO subsystem is to provide a large, fixed amplitude balanced
signal to drive the mixer independent of the level of the LO input.
A simplified schematic of the device is shown in Figure 52.
The IF amplifier is a balanced feedback design that simultaneously
provides the desired gain, noise figure, and input impedance that
is required to achieve the overall performance. The balanced open-
collector output of the IF amplifier, with impedance modified
by the feedback within the amplifier, permits the output to be
connected directly to a high impedance filter, differential amplifier,
or an analog-to-digital input while providing optimum second-
order intermodulation suppression. The differential output
impedance of the IF amplifier is approximately 200 . If
operation in a 50  system is desired, the output can be
transformed to 50  by using a 4:1 transformer.
ADL5358
VGS0
VGS1
VGS2
LOSW
PWDN
VPOS
COMM
LOI2
LOI1
MNIN
MNCT
COMM
DVIN
VPOS
COMM
VPOS
COMM
DVCT
V
P
O
S
D
V
G
M
C
O
M
M
D
V
O
P
D
V
O
N
D
V
L
E
V
P
O
S
D
V
L
G
N
C
M
N
O
N
C
O
M
M
M
N
G
M
V
P
O
S
M
N
O
P
M
N
L
E
V
P
O
S
M
N
L
G
N
C
07885-001
The intermodulation performance of the design is generally limited
by the IF amplifier. The IP3 performance can be optimized by
adjusting the IF current with an external resistor.
Figure 41,
Figure 43, and Figure 44 illustrate how various IF and LO bias
resistors affect the performance with a 5 V supply. Additionally,
dc current can be saved by increasing either or both resistors. It
is permissible to reduce the dc supply voltage to as low as 3.3 V,
further reducing the dissipated power of the part. No performance
enhancement is obtained by reducing the value of these resistors,
and excessive dc power dissipation may result.
Figure 52. Simplified Schematic
RF SUBSYSTEM
The single-ended, 50  RF input is internally transformed to a
balanced signal using a low loss (<1 dB) unbalanced-to-balanced
(balun) transformer. This transformer is made possible by an
extremely low loss metal stack, which provides both excellent
balance and dc isolation for the RF port. Although the port can be
dc connected, it is recommended that a blocking capacitor be used
to avoid running excessive dc current through the part. The RF
balun can easily support an RF input frequency range of 500 MHz
to 1700 MHz.
ADL5358
Rev. 0 | Page 18 of 24
LO SUBSYSTEM
The LO amplifier is designed to provide a large signal level to
the mixer to obtain optimum intermodulation performance.
The resulting amplifier provides extremely high performance
centered on an operating frequency of 1100 MHz. The best
operation is achieved with either high-side LO injection for RF
signals in the 500 MHz to 1200 MHz range or low-side injection
for RF signals in the 1200 MHz to 1700 MHz range. Operation
outside these ranges is permissible, and conversion gain is
extremely wideband, easily spanning 500 MHz to 1700 MHz,
but intermodulation is optimal over the aforementioned ranges.
The ADL5358 has two LO inputs permitting multiple synthesizers
to be rapidly switched with extremely short switching times
(<40 ns) for frequency agile applications. The two inputs are
applied to a high isolation SPDT switch that provides a constant
input impedance, regardless of whether the port is selected, to
avoid pulling the LO sources. This multiple section switch also
ensures high isolation to the off input, minimizing any leakage
from the unwanted LO input that may result in undesired IF
responses.
The single-ended LO input is converted to a fixed amplitude
differential signal using a multistage, limiting LO amplifier. This
results in consistent performance over a range of LO input power.
Optimum performance is achieved from −6 dBm to +10 dBm,
but the circuit continues to function at considerably lower levels
of LO input power.
The performance of this amplifier is critical in achieving a
high intercept passive mixer without degrading the noise floor
of the system. This is a critical requirement in an interferer rich
environment, such as cellular infrastructure, where blocking
interferers can limit mixer performance. The bandwidth of the
intermodulation performance is somewhat influenced by the
current in the LO amplifier chain. For dc current sensitive
applications, it is permissible to reduce the current in the LO
amplifier by raising the value of the external bias control resistor.
For dc current critical applications, the LO chain can operate
with a supply voltage as low as 3.3 V, resulting in substantial
dc power savings.
In addition, when operating with supply voltages below 3.6 V, the
ADL5358 has a power-down mode that permits the dc current
to drop to <300 µA.
The logic inputs are designed to work with any logic family that
provides a Logic 0 input level of less than 0.4 V and a Logic 1
input level that exceeds 1.4 V. All logic inputs are high impedance
up to Logic 1 levels of 3.3 V. At levels exceeding 3.3 V, protection
circuitry permits operation up to 5.5 V, although a small bias
current is drawn.
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ADL5358ACPZ-R7

Mfr. #:
Buy ADL5358ACPZ-R7
Manufacturer:
Analog Devices Inc.
Description:
RF Mixer 1,2G dual mixer, dual mixer/amp
Lifecycle:
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