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參數(shù)資料
| 型號： | MAX2360 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple Bus Buffer Gates With 3-State Outputs 14-PDIP -40 to 85 |
| 中文描述： | 完備的雙頻段正交發(fā)送器 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大小： | 413K |
| 代理商： | MAX2360 |
M
Complete Dual-Band
Quadrature Transmitters
______________________________________________________________________________________
11
Detailed Description
The MAX2360 complete quadrature transmitter accepts
differential I/Q baseband inputs with external common-
mode bias. A modulator upconverts this to IF frequency
in the 120MHz to 300MHz range. A gain control voltage
pin (VGC) controls the gain of both the IF and RF VGAs
simultaneously to achieve best noise and linearity per-
formance. The IF signal is brought off-chip for filtering,
then fed to a single sideband upconverter followed by
the RF VGA and PA driver. The RF upconverter requires
an external VCO for operation. The IF PLL, RF PLL, and
operating mode can be programmed by an SPI/QSPI/
MICROWIRE-compatible 3-wire interface.
The following sections describe each block in the
MAX2360
Functional Diagram.
I/Q Modulator
Differential in-phase (I) and quadrature-phase (Q) input
pins are designed to be DC-coupled and biased with the
baseband output from a digital-to-analog converter
(DAC). I and Q inputs need a DC bias of V
CC
/2 and a
current-drive capability of 6μA. Common-mode voltage
will work within a +1.35V to (V
CC
- 1.25V) range.
Typically, I and Q will be driven differentially with a
200mV
RMS
baseband signal. Optionally, I and Q may be
programmed for 100mV
RMS
operation with the IQ_LEVEL
bit in the configuration register. The IF VCO output is fed
into a divide-by-two/quadrature generator block to derive
quadrature components to drive the IQ modulator. The
output of the modulator is fed into the VGA.
IF VCOs
There are two VCOs to support high IF and low IF appli-
cations. The VCOs oscillate at twice the desired IF fre-
quency. Oscillation frequency is determined by external
tank components (see
Applications Information
).
Typical phase-noise performance for the tank is as
shown in Table 1. The high-band and low-band VCOs
can be selected independently of the IF port being
used.
IFLO Output Buffer
IFLO provides a buffered LO output when BUF_EN is 1.
The IFLO output frequency is equal to the VCO fre-
quency when BUF_DIV is 0, and half the VCO frequen-
cy when BUF_DIV is 1. The output power is -6dBm. This
output is intended for applications where the receive IF
is the same frequency as the transmit IF.
IF/RF PLL
The IF/RF PLL uses a charge-pump output to drive a
loop filter. The loop filter will typically be a passive sec-
ond-order lead lag filter. Outside the filter’s bandwidth,
phase noise will be determined by the tank compo-
nents. The two components that contribute most signifi-
cantly to phase noise are the inductor and varactor.
Use high-Q inductors and varactors to maximize equiv-
alent parallel resistance. The IF_TURBO_CHARGE and
the RF_TURBO_CHARGE bits in the CONFIG register
can be set to 1 to enable turbo mode. Turbo mode pro-
vides maximum charge-pump current during frequency
acquisition. Turbo mode is disabled after the second
transition from phase lead to phase lag or from phase
lag to phase lead. Turbo mode is also disabled after
frequency acquisition is achieved. When turbo mode is
disabled, charge-pump current will return to the pro-
grammed levels as set by ICP and RCP bits in the
CONFIG register (Table 4).
IF VGA
The IF VGA allows varying an IF output level that is con-
trolled by the VGC. The voltage range on VGC of 0.5V
to 2.6V. provide a gain-control range of 85dB. There
are two differential IF output ports from the VGA.
IFOUTL+/IFOUTL- are optimized for low IF operation
(120MHz to 235MHz) for IFOUTH+/IFOUTH- support
high IF operation (120MHz to 300MHz). IFOUTL ports
support direct VCO FM modulation. The differential IF
output port has an output impedance of 600
when
pulled up to V
CC
through a choke.
Single Sideband Mixer
The RF transmit mixer uses a single sideband architec-
ture to eliminate an off-chip RF filter. The single sideband
mixer has IF input stages that correspond to IF output
ports of the VGA. The mixer is followed by the RF VGA.
The RF VGA is controlled by the same VGC pin as the IF
VGA to provide optimum linearity and noise perfor-
mance. The total power control range is >100dB.
PA Driver
The MAX2360 includes three power-amplifier (PA) dri-
vers. Each is optimized for the desired operating fre-
quency. RFL is optimized for cellular-band operation.
Table 1. Typical VCO Phase Noise
(IF = 130.38MHz)
30
120
12.5
1
OFFSET (kHz)
PHASE NOISE (dBc)
-80
-105
-111
-121
-128
900
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