RFMD RF2494

RF2494
Preliminary
8
HIGH FREQUENCY LNA/MIXER
Typical Applications
• Part of 2.4GHz IEEE802.11b WLANs
• WLAN or Wireless Local Loop
• Digital Communication Systems
• Portable Battery-Powered Equipment
• Spread-Spectrum Communication Systems • UHF Digital and Analog Receivers
1.00
0.85
.80
.65
The RF2494 is a monolithic integrated UHF receiver front
end suitable for 2.4GHz ISM band applications. The IC
contains all of the required components to implement the
RF functions of the receiver except for the passive filtering and LO generation. It contains an LNA (low-noise
amplifier), a second RF amplifier and a doubly balanced
mixer. The output of the LNA is made available as an output to permit the insertion of a bandpass filter between
the LNA and the RF/Mixer section. The mixer outputs can
be selectively disabled to allow for the IF filter to be used
in the transmit mode.
4.00
sq.
.60
.24 typ
.65
.30
4 PLCS
2
.35
.23
1.85
1.55 sq.
.75
.50
12°
max
.05
.01
.23
.13
.65
4 PLCS
8
Dimensions in mm.
NOTES:
1
Shaded Pin is Lead 1.
2
Dimension applies to plated terminal and is measured between 0.02 mm and
0.25 mm from terminal end.
FRONT-ENDS
Product Description
3 Pin 1 identifier must exist on top surface of package by identification mark or
feature on the package body. Exact shape and size is optional.
Package Warpage: 0.05 max.
Die thickness allowable: 0.305 mm max.
4
5
Optimum Technology Matching® Applied
Si CMOS
LNA OUT
SiGe HBT
VCC4
GaAs MESFET
GS
üSi Bi-CMOS
GaAs HBT
LNA IN
Si BJT
16
15
14
13
PD 1
VCC1 2
Bias
Circuits
LNA
RF AMP
VCC2 3
MIX OUT- 4
6
7
8
• 2400MHz to 2500MHz Operation
• Two Gain Settings: 28dB or 12dB
12 NC
• 4.5dB Cascaded NF, High Gain Mode
11 NC
• 20mA DC Current Consumption
10 MIX IN
• Input IP3: -23dBm or -8dBm
MIX OUT+
LO IN
RX EN
VCC3
GND3
Functional Block Diagram
Rev A0 010730
Features
• Single 2.7V to 3.6V Power Supply
9
5
Package Style: LCC, 16-Pin, 4x4
Ordering Information
RF2494
High Frequency LNA/Mixer
RF2494 PCBA-H Fully Assembled Evaluation Board (2.5GHz)
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
8-53
RF2494
Preliminary
Absolute Maximum Ratings
Parameter
Supply Voltage
Input LO and RF Levels
Operating Ambient Temperature
Storage Temperature
Parameter
Rating
Unit
-0.5 to 3.6
+6
-40 to +85
-40 to +150
VDC
dBm
°C
°C
Specification
Min.
Typ.
Max.
Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate
at the time of this printing. However, RF Micro Devices reserves the right to
make changes to its products without notice. RF Micro Devices does not
assume responsibility for the use of the described product(s).
Unit
T = 25°C, VCC =3V, RF=2442 MHz,
LO=2068MHz, -10dBm
Overall
RF Frequency Range
IF Frequency Range
Cascade Gain
Cascade IP3
10
26
13
-29
Cascade Noise Figure
Input P1dB
FRONT-ENDS
8
Condition
2400 to 2500
374
28
15
-22
-8
4.5
18
-28
-14
500
31
17
-19
MHz
MHz
dB
dB
dBm
dBm
dB
dB
dBm
dBm
IF=374MHz, GAIN SEL=1
IF=374MHz, GAIN SEL=0
Referenced to the input, GAIN SEL = 1
Referenced to the input, GAIN SEL = 0
Single sideband, GAIN SEL = 1
Single sideband, GAIN SEL = 0
GAIN SEL = 1
GAIN SEL = 0
LNA
Noise Figure
2.3
7
Input VSWR
Input IP3
dB
dB
2:1
Gain
Reverse Isolation
Output Impedance
-3
-3
10
-6
22
50
dBm
dBm
dB
dB
dB
Ω
10
50
-17
18
dB
Ω
dBm
dB
4
kΩ
GAIN SEL = 1
GAIN SEL = 0
No external matching
GAIN SEL = 1
GAIN SEL = 0
GAIN SEL = 1
GAIN SEL = 0
RF Amp and Mixer
Noise Figure
Input Impedance
Input IP3
Conversion Power Gain
Output Impedance
Single sideband
With Current Combiner (1kΩ between open
collectors and 250 Ω single ended load)
Open Collector
LO Input
LO Level
LO to RF Rejection
LO to IF Rejection
LO Input VSWR
-15
-10
42
15
0
dBm
dB
dB
LO input to LNA input
LO input to IF output
400
100
300
1000
200
V
mV
nS
nS
Voltage at the input of RX EN, PD
and GAIN SEL
From PD Going high.
From RX EN Going high. PD = “1”
3.3
17
17
10
0.2
3.6
26
26
16
1
V
mA
mA
mA
µA
GAIN SEL=1, RX EN =1, PD=1
GAIN SEL=0, RX EN =1, PD=1
GAIN SEL=X, RX EN=0, PD=1
GAIN SEL=X, RX EN=X, PD =0
2:1
Power Down Control
Logic Controls “ON”
Logic Controls “OFF”
Turn on Time
Turn on Time
VCC -0.3
Power Supply
Voltage
Current Consumption
2.7
15
8
8-54
Rev A0 010730
RF2494
Pin
1
Function
PD
2
VCC1
3
VCC2
4
MIXOUT-
5
6
MIXOUT+
LO IN
Description
The power enable pin. When PD is >VCC - 300mV, the part is biased
on. When PD is <300mV, then the part is turned off and typically draws
less than 1µA.
Supply voltage for bias circuits and logic control. A 10pF external
bypass capacitor is required and an additional 0.01µF is required if no
other low frequency bypass capacitors are nearby. The trace length
between the pin and the bypass capacitors should be minimized. The
ground side of the bypass capacitors should connect immediately to
ground plane.
Supply voltage for LO_Buffer. A 10pF bypass capacitor is required and
an additional 0.01µF is required if there is no other low frequency
bypass capacitor in the area. The trace length between the pin and the
bypass capacitors should be minimized. The ground side of the bypass
capacitors should connect immediately to ground plane.
The inverting open collector output of the mixer. This pin needs to be
externally biased and DC isolated from other parts of the circuit. This
output can drive a Balun, with MIXOUT+, to convert to unbalanced to
drive a SAW filter. The Balun can be either broadband (transformer) or
narrowband (discrete LC matching). Alternatively, MIXOUT+ may be
used alone to drive a SAW single-ended, with an RF choke (high Z at
IF) from VCC to MIXOUT-.
The non-inverting open collector output of the mixer. This pin needs to
be externally biased and DC isolated from other parts of the circuit.
This output can drive a Balun, with MIXOUT+, to convert to unbalanced
to drive a SAW filter. The Balun can be either broadband (transformer)
or narrowband (discrete LC matching). Alternatively, MIXOUT+ may be
used alone to drive a SAW single-ended, with an RF choke (high Z at
IF) from VCC to MIXOUT+.
LO input pin. This input needs a DC-blocking cap. External matching is
recommended to 50Ω.
Interface Schematic
See pin 6.
MIX OUT+
MIX OUT-
See pin 4.
8
VCC2
FRONT-ENDS
Preliminary
LO IN
7
RX EN
8
9
VCC3
GND3
10
MIX IN
This control pin allows the mixer output pins to be put into a high
impedance state. This allows the transmit signal path to share the
same IF filter as the receiver.
Supply voltage for mixer preamp.
Ground pin for mixer preamp. This lead inductance is intended to be
similar to VCC3 lead inductance.
Mixer RF Input port. This pin is NOT internally DC-blocked. An external
blocking capacitor must be provided if the pin is connected to a device
with DC present. A value of >22pF is recommended. To minimize the
noise figure it is recommended to have a bandpass filter before this
input. This will prevent the noise at the image frequency from being
converted to the IF.
See pin 10.
See pin 10.
VCC3
MIX IN
GND3
11
12
NC
NC
Rev A0 010730
Not connected.
Not connected.
8-55
RF2494
Pin
13
Function
LNA OUT
14
VCC4
Preliminary
Description
Interface Schematic
RF signal output for external 50Ω filtering.The use of a filter here is
optional but does provide for lower noise floor and better out-of-band
rejection.
Supply voltage for the LNA. This pin should be bypassed with a 10 pF
capacitor to ground as close to the pin as possible. The shunt inductance from this pin to ground via the supply decoupling must be tuned
to match the LNA output to 50Ω at the desired operating frequency.
See pin 14.
Microstrip
EXTERNAL
DECOUPLING
VCC4
-16 dB
P15
LNA OUT
P2
LNA IN
BIAS
P1
GAIN SEL
15
GS
16
LNA IN
LNA gain control. When GAIN SEL is >VCC - 300mV, LNA gain is at 10
dB. When GAIN SEL is <300mV, the LNA gain is -6dB.
This pin is NOT internally DC blocked. An external blocking capacitor
must be provided if the pin is connected to a device with DC present. If
a blocking capacitor is required, a value of 2pF is recommended.
See pin 14.
See pin 14.
FRONT-ENDS
8
8-56
Rev A0 010730
RF2494
Preliminary
Theory of Operation
IL = 1-3 dB
2.4 to 2.483 GHz
RF Micro Devices
2.4 GHz ISM Chipset
RF2948
RX VGC
RF2494
SSOP-16 EPP
Gain
Select
OUT Q
SAW
IL = 10 dB max
RX
LNA
Dual Gain Modes
-5 dB and +10 dB
RX
IF Amp
15 dB
15 dB Gain
-15 dB to 35 dB Gain
TX
OUT I
Filter
15 dB
2.4 to 2.483 GHz
Base Band Amp.
Active Selectable LPF
(fC = 1 MHz to 40 MHz)
0-30 dB Gain
TX
T/R
Switch
Dual
Frequency
Synthesizer
RF
VCO
IF
VCO
* 2
+45
°
-45°
Filter
I INPUT
RF2189
15 dB Gain
Range
10 dBm
PA Driver
Σ
Filter
Selectable LPF
Q INPUT
TX VGC
IL = 1-3 dB
2.4 to 2.483 GHz
Figure 1. Entire Chipset Functional Block Diagram
The mixer on the RF2494 is also two stages. The first
stage is a common emitter amp used to boost the total
power gain prior to the lossy SAW filter, to convert to a
differential signal to the input of the mixer, and to
improve the noise figure of the mixer. The second
stage is a double balanced mixer whose output is differential open collector. It is recommended that a “current combiner” is used (as shown in figure 2) at the
mixer output to maximize conversion gain, but other
loads can also be used. The current combiner is used
to do a differential to single ended conversion for the
SAW filter. C1, C2 and L1 are used to tune the circuit
for a specific IF frequency. L2 is a choke to supply DC
current to the mixer that is also used as a tuning element, along with C3, to match to the SAW filter’s input
impedance. RL is the SAW filter’s input impedance.
Rev A0 010730
The mixer power conversion gain is +19dB when R1 is
set to 1k Ω. The conversion gain can be adjusted up
~5dB or down ~7dB by changing the value of R1.
Once R1 is chosen, L2 and C3 can be used to tune the
output for the SAW filter.
VCC
C1
C2 L2
C3
L1
R1
OUT
RL
Open Collector
Mixer Output
Figure 2. Current Combiner for Mixer Load
The cascaded power gain of the LNA/Mixer is 29dB,
which after insertion loss in the image filter (~3dB) and
IF SAW filter (~10dB), still gives 16dB of gain prior to
the IF amps. Because of this, the noise figure of the IF
amps should not significantly degrade system noise
figure.
The LNA input should be matched for a good return
loss for optimum gain and noise figure. To allow the
designer to match each of these ports, 2-port s-parameter data is available for the LNA, and 1-port data is
available for MIXER IN and LO IN.
8-57
8
FRONT-ENDS
The RF2494 contains the LNA/Mixer for this chipset.
The LNA is made from two stages including a common
emitter amplifier stage with a power gain of 13dB and
an attenuator which has an insertion loss of 3dB in
high gain mode, and 17dB in low gain mode. The
attenuator was put after the LNA so that system noise
figure degradation would be minimized. A single gain
stage was used prior to the image filter to maximize
IP3 which minimizes the risk of large out-of-bad signals
jamming the desired signal.
RF2494
Preliminary
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
GS VCC4
R6
10 Ω
C9
10 nF
L6
4.7 nH
J1
LNA IN
50 Ω µstrip
C8
2 pF
C5
10 nF
C10
1.5 pF
50 Ω µstrip
16
PD
1
VCC1, VCC2
2
C11
0.5 pF
C4
10 nF
C19
22 pF
15
14
13
LNA
11
RF AMP
3
R1
2.2 kΩ
L2
120 nH
IN
GND
OUT
9
5
6
7
L5
1.8 nH
50 Ω µstrip
J2
LNA OUT
FL1
R3
0Ω
10
4
C12
0.5 pF
R2
0Ω
12
Bias
Circuits
R4*
0Ω
C17
10 nF
C2
0.5 pF
50 Ω µstrip
R5*
0Ω
50 Ω µstrip
J4
MIX IN
8
VCC3
2494400-
L1
100 nH
C6
10 nF
8
FRONT-ENDS
J3
IF OUT
C3
10 nF
P1-1
P1-3
8-58
C7
10 nF
RX EN
C18
10 nF
50 Ω µstrip
P2
P1
1
VCC1, VCC2
2
GND
3
PD
CON3
C21
22 pF
50 Ω µstrip
C15
22 pF
50 Ω µstrip
L3
8.2 nH
C16
1 pF
P2-1
P2-3
C20
10 nF
P3
1
GS
2
GND
3
VCC4
CON3
P3-1
P3-3
1
VCC3
2
GND
3
RX EN
J5
LO IN
* For cascaded configuration,
jumpers R2 and R3 need to be
installed with R4 and R5 taken out.
CON3
Rev A0 010730
RF2494
Preliminary
Evaluation Board Layout
Board Size 1.5” x 1.5”
Board Thickness 0.031”, Board Material FR-4, Multi-Layer
FRONT-ENDS
8
NOTE: In the following charts, all cascaded data measured with a bandpass filter inserted between LNA OUT and MIX
IN, having cut frequencies: fL =TBD, fM =TBD, and insertion loss=TBD.
Rev A0 010730
8-59
RF2494
Preliminary
LNA + Mixer Gain versus VCC (2.45 GHz),
Attenuator Off
LNA + Mixer IIP3 versus VCC (2.45 GHz),
Attenuator Off
-24.0
33.0
-40C IIP3
32.0
25C IIP3
-25.0
-40C Gain
31.0
85C IIP3
25C Gain
-26.0
85C Gain
IIP3 (dBm)
Gain (dB)
30.0
29.0
-27.0
-28.0
28.0
-29.0
27.0
-30.0
26.0
25.0
-31.0
2.7
3.0
3.3
2.7
3.6
3.0
VCC
3.3
3.6
VCC
LNA + Mixer Gain versus RF Frequency (3.3 V),
Attenuator Off
LNA + Mixer IIP3 versus RF Frequency (3.3V),
Attenuator Off
34.00
-24.00
33.00
-25.00
32.00
-26.00
-40C IIP3
25C IIP3
85C IIP3
8
-40C Gain
25C Gain
IIP3 (dBm)
Gain (dB)
-27.00
85C Gain
30.00
-28.00
29.00
-29.00
28.00
-30.00
27.00
-31.00
26.00
2.40
2.45
-32.00
2.40
2.50
RF Frequency (GHz)
2.45
2.50
RF Frequency (GHz)
LNA + Mixer Gain versus VCC (2.45 GHz),
Attenuator On
LNA + Mixer IIP3 versus VCC (2.45 GHz),
Attenuator On
-8.6
14.0
-40C Gain
13.5
-8.8
25C Gain
85C Gain
13.0
-9.0
12.5
-40C IIP3
-9.2
12.0
IIP3 (dBm)
Gain (dB)
FRONT-ENDS
31.00
11.5
11.0
25C IIP3
-9.4
85C IIP3
-9.6
-9.8
10.5
-10.0
10.0
-10.2
9.5
9.0
-10.4
2.7
3.0
3.3
VCC
8-60
3.6
2.7
3.0
3.3
3.6
VCC
Rev A0 010730
RF2494
Preliminary
LNA + Mixer Gain versus RF Frequency (3.3 V),
Attenuator On
LNA + Mixer IIP3 versus RF Frequency (3.3 V),
Attenuator On
15.00
-7.00
-40C IIP3
-40C Gain
14.50
-7.50
25C Gain
14.00
25C IIP3
85C IIP3
85C Gain
13.50
-8.00
13.00
IIP3 (dBm)
Gain (dB)
-8.50
12.50
12.00
11.50
-9.00
-9.50
11.00
10.50
-10.00
10.00
-10.50
9.50
9.00
2.40
2.45
-11.00
2.40
2.50
2.45
RF Frequency (GHz)
LNA + Mixer SSB Noise Figure versus VCC (2.45 GHz),
Attenuator Off
LNA + Mixer SSB Noise Figure versus
RF Frequency (3.3 V), Attenuator Off
5.50
5.6
25C NF
25C NF
85C NF
85C NF
5.4
-40C NF
-40C NF
5.00
5.2
5.0
4.8
8
4.50
FRONT-ENDS
SSB Noise Figure (dB)
SSB Noise Figure (dB)
2.50
RF Frequency (GHz)
4.00
3.50
4.6
4.4
2.7
3.0
3.3
3.00
2.40
3.6
2.45
VCC
LNA + Mixer SSB Noise Figure versus VCC (2.45 GHz),
Attenuator On
LNA + Mixer SSB Noise Figure versus
RF Frequency (3.3 V), Attenuator On
20.00
19.8
25C NF
25C NF
19.6
85C NF
19.00
85C NF
-40C NF
-40C NF
19.4
19.2
SSB Noise Figure (dB)
SSB Noise Figure (dB)
2.50
RF Frequency (GHz)
19.0
18.8
18.6
18.4
18.00
17.00
16.00
15.00
18.2
14.00
18.0
17.8
2.7
3.0
3.3
VCC
Rev A0 010730
3.6
13.00
2.40
2.45
2.50
RF Frequency (GHz)
8-61
RF2494
Preliminary
LNA + Mixer Gain versus IF Frequency (3.3 V)
LNA + Mixer IIP3 versus IF Frequency (3.3 V)
-23.0
32.0
IIP3
Gain
-24.0
31.0
-25.0
30.0
IIP3 (dBm)
Gain (dB)
-26.0
29.0
-27.0
-28.0
28.0
-29.0
27.0
-30.0
26.0
-31.0
0.0
50.0
100.0
150.0 200.0
0.0
250.0 300.0 350.0 400.0 450.0 500.0
50.0
100.0 150.0 200.0 250.0 300.0 350.0 400.0 450.0 500.0
IF Frequency (MHz)
IF Frequency (MHz)
LNA ICC versus VCC
(PD = 1, RX EN = 0)
12.7
Total ICC versus VCC
(PD = 1, RX EN = 1)
21.0
25C LNA Icc
25C Total Icc
85C LNA Icc
12.5
85C Total Icc
20.5
-40C LNA Icc
8
20.0
ICC (mA)
ICC (mA)
12.1
11.9
11.7
11.5
19.5
19.0
11.3
18.5
11.1
10.9
18.0
2.7
3.0
3.3
3.6
VCC
2.7
3.0
3.3
3.6
VCC
Isolation
-13.00
-18.00
-23.00
LO-mixin
Isolation (dB)
FRONT-ENDS
-40C Total Icc
12.3
LO-LNAin
-28.00
LNAin-LNAout
LO-IFout
-33.00
-38.00
-43.00
-48.00
2.12
2.17
2.22
LO Frequency (GHz)
8-62
Rev A0 010730
RF2494
Preliminary
LNA Gain versus VCC (2.45 GHz),
Attenuator Off
LNA IIP3 versus VCC (2.45 GHz),
Attenuator Off
-2.0
10.5
-40C IIP3
-40C Gain
10.4
-2.1
25C Gain
25C IIP3
85C IIP3
85C Gain
10.3
-2.2
-2.3
10.1
IIP3 (dBm)
Gain (dB)
10.2
10.0
9.9
-2.4
-2.5
9.8
-2.6
9.7
-2.7
9.6
9.5
-2.8
2.7
3.0
3.3
2.7
3.6
3.0
VCC
3.3
3.6
VCC
LNA Gain versus VCC (2.45 GHz),
Attenuator On
LNA IIP3 versus VCC (2.45 GHz),
Attenuator On
-4.0
-1.8
-40C Gain
25C Gain
-4.2
-2.0
85C Gain
8
-4.4
-2.2
-4.8
FRONT-ENDS
IIP3 (dBm)
Gain (dB)
-4.6
-40C IIP3
25C IIP3
-2.4
85C IIP3
-5.0
-2.6
-5.2
-2.8
-5.4
-5.6
-3.0
2.7
3.0
3.3
3.6
2.7
VCC
3.0
3.3
LNA Gain versus RF Frequency (3.3 V),
Attenuator Off
LNA IIP3 versus RF Frequency (3.3 V),
Attenuator Off
0.00
10.70
-40C Gain
10.60
-40C IIP3
25C Gain
25C IIP3
-0.50
85C Gain
85C IIP3
10.50
-1.00
10.40
10.30
IIP3 (dBm)
Gain (dB)
3.6
VCC
10.20
10.10
10.00
-1.50
-2.00
-2.50
9.90
-3.00
9.80
9.70
2.40
2.45
RF Frequency (GHz)
Rev A0 010730
2.50
-3.50
2.40
2.45
2.50
RF Frequency (GHz)
8-63
RF2494
Preliminary
LNA Gain versus RF Frequency (3.3 V),
Attenuator On
LNA IIP3 versus RF Frequency (3.3 V),
Attenuator On
-3.70
-1.90
-40C Gain
-2.00
25C Gain
-3.90
85C Gain
-2.10
-4.10
-40C IIP3
25C IIP3
-2.20
85C IIP3
IIP3 (dBm)
Gain (dB)
-4.30
-4.50
-4.70
-2.30
-2.40
-2.50
-4.90
-2.60
-5.10
-2.70
-5.30
-2.80
-5.50
2.40
2.45
-2.90
2.40
2.50
RF Frequency (GHz)
LNA Noise Figure versus VCC (2.45 GHz),
Attenuator Off
2.50
-40C NF
-40C NF
2.45
25C NF
2.28
85C NF
2.40
Noise Figure (dB)
Noise Figure (dB)
25C NF
85C NF
2.26
2.24
2.22
2.20
2.18
2.16
2.35
2.30
2.25
2.20
2.14
2.15
2.12
2.10
2.70
3.00
3.30
2.10
2.40
3.60
VCC
2.45
LNA Noise Figure versus RF Frequency (3.3 V),
Attenuator On
9.0
9.00
-40C NF
-40C NF
25C NF
8.5
25C NF
8.50
85C NF
85C NF
8.00
Noise Figure (dB)
8.0
7.5
7.0
6.5
7.50
7.00
6.50
6.0
6.00
5.5
5.50
5.0
2.7
3.0
3.3
VCC
8-64
2.50
RF Frequency (GHz)
LNA Noise Figure versus VCC (2.45 GHz),
Attenuator On
Noise Figure (dB)
FRONT-ENDS
8
2.50
LNA Noise Figure versus RF Frequency (3.3 V),
Attenuator Off
2.32
2.30
2.45
RF Frequency (GHz)
3.6
5.00
2.40
2.45
2.50
RF Frequency (GHz)
Rev A0 010730
RF2494
Preliminary
Mixer Gain versus VCC (2.45 GHz)
Mixer IIP3 versus VCC (2.45 GHz)
-14.5
22.0
-40C IIP3
-40C Gain
25C IIP3
25C Gain
21.0
-15.0
85C Gain
85C IIP3
-15.5
IIP3 (dBm)
Gain (dB)
20.0
19.0
-16.0
-16.5
18.0
-17.0
17.0
-17.5
16.0
-18.0
2.7
3.0
3.3
2.7
3.6
3.0
VCC
3.3
3.6
VCC
Mixer Gain versus RF Frequency (3.3 V)
Mixer IIP3 versus RF Frequency (3.3 V)
-15.00
22.00
-15.50
21.00
-40C IIP3
8
25C IIP3
-40C Gain
85C IIP3
IIP3 (dBm)
85C Gain
19.00
FRONT-ENDS
25C Gain
20.00
Gain (dB)
-16.00
-16.50
-17.00
18.00
-17.50
17.00
-18.00
16.00
2.40
2.45
-18.50
2.40
2.50
RF Frequency (GHz)
2.45
Mixer SSB Noise Figure versus VCC (2.45 GHz)
Mixer SSB Noise Figure versus RF Frequency (3.3 V)
13.5
13.00
-40C NF
25C NF
13.0
-40C NF
25C NF
85C NF
85C NF
12.00
12.5
SSB Noise Figure (dB)
SSB Noise Figure (dB)
2.50
RF Frequency (GHz)
12.0
11.5
11.0
11.00
10.00
9.00
8.00
10.5
10.0
2.7
3.0
3.3
VCC
Rev A0 010730
3.6
7.00
2.40
2.45
2.50
RF Frequency (GHz)
8-65
RF2494
Preliminary
Mixer Gain versus LO Amplitude
(VCC = 3.3 V, RF Frequency = 2.45 GHz)
Mixer IIP3 versus LO Amplitude
(VCC = 3.3 V, RF Frequency = 2.45 GHz)
20
-14
IIP3
19
-15
18
-16
IIP3 (dBm)
Gain (dB)
Gain
17
-17
16
-18
15
-19
14
-20
-24
-22 -20 -18 -16
-14 -12 -10
-8
-6
LO Amplitude (dBm)
-4
-2
0
2
4
6
-24 -22 -20 -18 -16 -14 -12 -10
-8
-6
-4
-2
0
2
4
6
LO Amplitude (dBm)
FRONT-ENDS
8
8-66
Rev A0 010730