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RF2713 Datasheet(PDF) 6 Page - RF Micro Devices

Part No. RF2713
Description  QUADRATURE MODULATOR/DEMODULATOR
Download  12 Pages
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Manufacturer  RFMD [RF Micro Devices]
Direct Link  http://www.rfmd.com
Logo RFMD - RF Micro Devices

RF2713 Datasheet(HTML) 6 Page - RF Micro Devices

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Preliminary
7-22
RF2713
Rev A2 010129
5
Pin
Function
Description (Modulator Configuration)
Interface Schematic
1I INPUT A
When the RF2713 is configured as a Quadrature Modulator, each
mixer is driven by an independent baseband modulation channel (I and
Q). The mixers can be driven single-endedly (as shown in the modula-
tor application circuit) or differentially. When driving single-endedly, the
B Inputs (pins 2 and 4) should be connected to each other. This
ensures that the baseband signals will reach each mixer with the same
DC reference, yielding the best carrier suppression. Note that the input
impedance changes according to the drive mode (see the mixer equiv-
alent circuit on the previous page). The single-ended input impedance
(as shown in the modulator application circuit) is 1200
Ω for each of the
two inputs. In the balanced configuration, the input impedance would
be 2400
Ω for each of the two inputs.
The mixers are Gilbert Cell designs with balanced inputs. The equiva-
lent schematic for one of the mixers is shown on the previous page.
The input impedance of each pin is determined by the 1200
Ω resistor
to VCC in parallel with a transistor base. Note from the schematic that
all four input pins have an internally set DC bias. For this reason, all
four inputs (pins 1 through 4) should be DC blocked. The capacitance
values of the blocking capacitors is determined by the baseband fre-
quency. When driving single-endedly, both the series (pins 1 and 3) and
shunt (pins 2 and 4) blocking capacitors should be low impedances, rel-
ative to the input impedance.
DC bias voltages may be supplied to the inputs pins, if required, in
order to increase the amount of carrier suppression. For example, the
DC levels on the reference inputs (pins 2 and 4) may be offset from
each other by adding different resistor values to ground. These resis-
tors should be larger than 2k
Ω. Note from the mixer schematic that all
four input pins have an internally set DC bias. If DC bias is to be sup-
plied, the allowable ranges are limited. For 5V applications, the DC ref-
erence on both I pins or both Q pins must not go below 2.7VDC, and in
no case should the DC voltage on any of the four pins go below 2.0VDC
or above 5.5VDC. IF a DC reference is to be supplied, the source must
also be capable of sinking current. If optimizing carrier suppression fur-
ther is not a concern, it is recommended that all four inputs (pins 1
through 4) be DC blocked.
2I INPUT B
Same as pin 1, except complementary input.
See pin 1.
3Q INPUT A
Same as pin 1, except Q Buffer Amplifier.
See pin 1.
4Q INPUT B
Same as pin 3, except complementary input.
See pin 1.
5BG OUT
Band Gap voltage reference output. This voltage output is held con-
stant over variations in supply voltage and operating temperature and
may be used as a reference for other external circuitry. This pin should
not be loaded such that the sourced current exceeds 1mA. This pin
should be bypassed with a large (0.1
µF) capacitor.
6
I IF OUT
Connecting pins 6 and 7 to each other accomplishes the summing
function of the upconverted I and Q channels. In addition, because
these outputs are open collector type, they must be connected to VCC
in order to properly bias the Gilbert Cell mixers. Maximum gain and out-
put power occur when the load on these two pins is ~1200
Ω.Inmost
applications the impedance of the next stage will be lower and a reac-
tive impedance transforming match should be used if maximum gain
and output level are of concern. Biasing, DC blocking, and impedance
transformation can simultaneously be achieved with the shunt-L /
series-C topology shown in the Application Circuit. The inductance and
capacitance values are chosen to achieve a specific impedance trans-
forming ratio at a specific IF frequency. For applications where the gain
is not as critical, a 1200
Ω resistor may be added in parallel with a
choke inductor in place of the matching inductor. If neither gain nor out-
put level is critical, the inductor may be replaced with a resistor that
sets the desired source impedance to drive the next stage. If the next
stage is an "open" at DC, the blocking capacitor may be eliminated.
1260
1260
INPUT A
V
CC
V
CC
INPUT B
IF OUT


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